Dispersion Leakage Elimination Electrostatic Method

For synthetic fiber fabrics, the conductivity of the fabrics can be increased by reducing the resistance. The main method of reducing resistance is to use surfactants to hydrophilicize the fibers or fabrics, so as to improve the hygroscopicity of the fibers, thereby reducing the resistance of textiles, speeding up the charge dissipation, dispersing the charge and eliminating static electricity through propagating, leaking. The antistatic effect of this method is difficult to preserve for a long time, the washing resistance is poor, and the antistatic performance is not shown under low humidity conditions. In addition, in order to reduce the production of electrostatic charge, antistatic oils coated on the interface of textile materials make the friction and contact between materials insufficient and direct, thus reducing the charge transfer. 。 Another mechanism is that the hydrophobic end of surfactant molecule is adsorbed on the surface of the fiber, and hydrophilic groups point to the space, forming a polar interface, adsorbing water molecules in the air, reducing the surface specific resistance of the fiber or fabric, and accelerating the charge dissipation. This is the main way most antistatic agents work. Another way that antistatic agent works is ionization. Ionized antistatic agent itself has good conductivity. Under the action of surface water molecule, this kind of oil agent molecule ionizes, which significantly improves the conductivity of the fiber surface. At the same time, it can eliminate charges by neutralizing the surface charge.

 Dispersion Leakage Elimination Electrostatic Method

Chemical Modification Methods

Antistatic fibers were prepared by blending, copolymerization, grafting modification of fibre-forming polymers, introducing hydrophilic polar groups, or adding antistatic agents inside the fibers. Its common characteristic is to improve the hygroscopicity of fibers and accelerate the charge dissipation. Textiles made from antistatic fibers or blended with high proportion of synthetic fibers can eliminate electrostatic problems in processing and use, but the high humidity environment is still a necessary condition for charge dissipation.

Chemical Modification Methods

Corona discharge method for eliminating static electricity

Fabrics are made of uniformly mixed textile fibers and conductive fibers. Conductive homogeneous conductive fibers such as metal fibers, carbon fibers and conductive polymers or conductive materials such as carbon black coated on the outer layer of synthetic fibers are used to coat conductive fibers, and conductive materials such as carbon black or metal compound polymers are used to prepare conductive composite conductive fibers by composite spinning. The application of conductive fibers makes textiles have remarkable antistatic effect, durability and not affected by environmental humidity, and can be applied to special functional textiles such as antistatic work clothes. Using different electrostatic sequences, different fibers are blended or interwoven to reduce electrostatic.


The application and development of conductive fibers in the above three methods are the direction of antistatic product development. At present, more and more attention has been paid to them. However, there are many problems that need to be further discussed in the application. For example, the anti-static mechanism of conductive fiber inlay and the evaluation method of anti-static property of fabric containing conductive fiber need to be further studied and discussed.

Static electricity is a natural phenomenon, which can be generated from different ways, such as contact, friction, stripping and so on. Electrostatic protection technologies, adopted by electronics, semiconductors, petroleum, ordnance, textile, rubber, aviation and military fields, resort to reduce the loss caused by static electricity.
  • Precautionary Measures
  • Grounding
  • Shield
  • Neutralization
  • Protective Equipment
  • Daily Life Common Sense
  • Explanation on Electrostatic
  • Main ESD Prevention Products
  • Electrostatic system

Precautionary Measures

There are three main anti-static measures: antistatic clothing, antistatic shoes and anti-static wrist bands.

Anti static shoes and anti-static wrist bands are used to conduct static electricity so as to avoid accumulation on the human body.

Antistatic garments & shoes

Common clothes produce a large static voltage (> 1000V) while the wearer moving around. This wouldn’t occur to antistatic clothes, and that’s the main reason for wearing antistatic clothes.

Long strip material anti-static clothing can not shield the static electricity generated by clothing (still >1000V after wearing). While he grid material antistatic clothing can do its job (<200V).

The static electricity is introduced into the outer ground line of the factory through conductive floor boards and the ground wires .

The prevention includes preventing static electricity generation and preventing its damage.

Electrostatic protection is a long-term system engineering, any fault or carelessness will lead to the failure of electrostatic protection.

Mainly the measures for electrostatic protection in the production process are electrostatic leakage, dissipation, neutralization, humidification, shielding and grounding.

Human body electrostatic protection system usually consists of anti-static wristband, anklet, work clothes, shoes & socks, caps, gloves or fingerstalls etc., with electrostatic leakage, neutralization and shielding functions.

The ground anti-static treatments are anti-static ceramic steel-based composite movable floor, anti-static steel movable floor, anti-static ceramic floor tiles and so on.
Grounding is very important to reduce the electrostatic charge on the conductor, the human body is a conductor, also a main source of electrostatic generation. Therefore, we must reduce the static charge generated by contact with the sensitive electrostatic components. Prevention of static electricity on the human body is best through grounding.

Some grounding devices:

In industry, wristband is the most commonly used grounding device. The wristband will safely and effectively drain the static charge from your body. Reasonable use of a wristband requires reasonable contact with the skin. A dirty or loose wrist strap may retain the static charge, which makes the antistatic control will fail. Conductive footwear or foot grounding can be used to overcome shortcomings of wrist bands.

Work Station Grounding Device

Conductive or electrostatic dissipative working surfaces are an indispensable part of an electrostatic safety workstation, especially where manual assembly occurs. While using wristbands, it is necessary for a clean working surface to be grounded properly at a joint. Conductive or electrostatic dissipative materials can produce electrostatic charges, however., when they are properly grounded, they can effectively drain static charges.


The next concept is to isolate parts and components during storage or transportation. It is isolated from a charged object or a charged electrostatic field. Insulator is the best way to prevent electrostatic discharge during storage or transportation. Since grounding cannot remove static charges or insulators, it is necessary to isolate sensitive parts and components from them. Reducing conventional plastics and other types of insulators in stationary working, shipping and handling areas is the best way to isolate products from insulators. Isolation can also be done by limiting access to the entire work area or workstation. Finally, we take advantage of the fact that electrostatic charges cannot enter containers made of conductive materials or layers. This effect is called the Faraday cup effect. When storing and transporting electronic components or loading circuit boards, ensure that containers with similar Faraday cup characteristics are used, and these containers will be isolated from electrostatic injuries.


Utilizing electrostatic elimination equipment, its main component is ion generator.

Neutralization is important because earthing and isolation will not release charge from insulators such as synthetic fabrics or conventional plastics. Neutralizing or removing the charge generated in insulator is called ionization. Ions are simply charged substances existing in the air. Ions are produced by natural energy materials. Including sunlight, lighting, open-air flame and radiation. We can get trillions of ions through ion generators, which use high voltages to produce a balanced mixture of charged ions, and fans to help ions drift to objects or regions to neutralize. Ionization can neutralize static charges on insulators in eight seconds, thus reducing their potential damage. Ionization is not a substitute for grounding or isolation. It only reduces the possibility or risk of electrostatic discharge accidents.

Protective Equipment

Personal static eliminator mainly refers to contact static eliminator and auto-sensor static eliminator.

Contact static eliminator

Contact hand-held personal electrostatic eliminator is a device that eliminates static electricity on human body or metal objects by touching metal objects with hand-held devices. But this is only temporary. In daily life, static electricity is produced all the time. After using contact static eliminator for a period of time, our body will feel electric shock when it contacts the electrostatic object/metal conductor again. So when we use the product, we need finish to the work as soon as possible.

Auto-sensor static eliminator

Automatic personal static eliminator is a device that automatically detects the static electricity in the surroundings and then automatically eliminates the static electricity. We don’t need any operation. The most outstanding feature of this automatic key chain is its exquisite workmanship, anti-static load up to 40,000 volts, and the ability to eliminate static electricity continuously.

Daily Life Common Sense

In daily life, people often accumulate static electricity due to clothing, climate, friction and other reasons. When they bump into metal, people will suffer from electric shock pain. Psychological pressure may be caused in some cases. If you avoid touching iron for a while, you may accumulate more electric charges on your body, sooner or later you will suffer from stronger electric shocks.

1. In the house, the rubbing of carpet and sole may produce static electricity, and outside, you may also be electrified by wind. Be careful when you enter or exit metal gate, your hands may experience shock. If this happens repeatedly, the following measures can be taken to avoid electric shock:

1.Don’t touch an iron door directly with your hands. Instead, hold the keys before that(usually you can avoid electric shock), touch the metal with the tip of a key, the electricity on your body will be released and you won’t get shocked.

Principle: Pain caused by hand discharge is due to high voltage discharge, because a sudden contact of your hand and metal door leaves a small area for discharging, resulting in instantaneous high voltage. If you take out the key in your pocket and hold it in a large area (a bunch of keys can’t transfer much electric charge by themselves, so there won’t be an electric shock at this time), then use the tip of a key to contact the large conductor. At this time, the contact point of discharge is not a point on the skin of the hand, but the tip of the key, so the hand will not feel it. (Maybe the key! If it feels pain.)

2. Frequent electric shocks occur when getting off the taxi. The main reason is that static electricity accumulates when the body rubs against the seat when getting off, and when the door closes, the hand will be shocked when it suddenly touches the iron door.

If this often happens, it’s better to take notice when you get off the car, that is, when your body rubs against your seat, you can hold the metal door frame in advance. When static electricity is generated by friction, you can remove static electricity from your body at any time, instead of discharging when you suddenly touch the iron door while getting off.

Explanation on Electrostatic

In order to effectively combat and prevent ESD (electrostatic discharge), the right equipment must be used in the correct way. Because of a series of powerful closed-loop ESD prevention, monitoring and ionizers, ESD can be regarded as a process control problem.

Electrostatic discharge (ESD) is a familiar and underestimated source of circuit board and component damage in electronic assembly. It affects every manufacturer, regardless of its size. Although many people believe they produce products in an ESD-safe environment, in fact, ESD-related damage continues to cost the world’s electronics manufacturing industry billions of dollars a year.

What is ESD?

Electrostatic discharge (ESD) is the sudden flow of electricity between two electrically charged objects caused by contact, an electrical short, or dielectric breakdown. A buildup of static electricity can be caused by tribocharging or by electrostatic induction. The ESD occurs when differently-charged objects are brought close together or when the dielectric between them breaks down, often creating a visible spark. The charge is stable under two conditions.

1. When it “falls” into a conductive but electrically insulated object, such as a metal screwdriver with a plastic handle.

2. When it resides on an insulating surface (e.g. plastic), it can not conduct on it.

However, if an electrically insulated conductor (screwdriver) with sufficient high charge is close to an integrated circuit (IC) with opposite potential, the charge “crossover” causes electrostatic discharge (ESD).

ESD occurs very quickly at very high intensity, usually producing enough heat to melt the internal circuit of semiconductor chips, which seemingly blows out small bullet holes under an electron microscope, causing immediate and irreversible damage. What’s more, a tenth of the cases are so bad that the whole component fails in the final test. In the other 90% cases , ESD damage only causes partial degradation – meaning that the damaged components can pass the final test without detection, and premature on-site failure occurs only after shipment to the customer. It will dishonor a manufacturer to have to correct any manufacturing defects.

However, the main difficulty in controlling ESD is that it is invisible but can damage electronic components. To produce a discharging that can hear a beep, a considerable charge of about 2,000 volts needs to be accumulated, while with 3,000 volts you can sense slight shock and with 5,000 volts you may see sparks.

For example, common components such as complementary metal oxide semiconductor (CMOS) or electrically programmable read-only memory (EPROM) can be destroyed by ESD potential differences of only 250 volts and 100 volts, while more and more sensitive modern components are out there. Including the Pentium processor, it can be destroyed by only 5 volts.

The problem is compounded by activities that cause damage every day. For example, in the vinyl factory floor, there is friction between the floor surface and the shoes. As a result, pure charges accumulate between 3 and 2,000 volts, depending on the relative humidity of the local air.

Even the friction generated by the natural movement of workers on the platform can produce 400~6000 volts. If the worker has treated the insulator during the PCB dismantled or packed in foam box or bubble bag, the net charge accumulated on the workers can reach about 26000 volts.

Therefore, as the main source of ESD hazards, all staff entering the electrostatic protected area (EPA) must be grounded to prevent any charge accumulation, and all surfaces should touch ground to maintain the same potential of everything and prevent ESD from occurring.

Main ESD Prevention Products

The main products used to prevent ESD are wristbands, with curly corduroy and dissipative surfaces or pads – both must be properly grounded. Supplements, such as dissipative footwear or heel straps and suitable clothing, are designed to prevent people from accumulating and maintaining net charges while moving in an electrostatic protection area (EPA).

PCB should also prevent ESD from internal and external transportation during and after assembly. There are many PCB packaging products that can be used in this area, including shielding bags, shipping boxes and mobile trolleys. Although the correct use of these devices will prevent 90% of ESD-related problems, in order to reach the final 10%, another protection is needed: ionization.

The most effective way to neutralize assembly equipment and surfaces that generate electrostatic charges is to use an ionizer, a device that blows ionized air out of the working area to neutralize any charges accumulated on insulating materials.

Antistatic Gloves

Antistatic Gloves

A common fallacy is that because a bowl belt is attached to the workstation, the charges of insulators in the area, such as polystyrene cups or cardboard boxes, will dissipate safely. By definition, insulators do not conduct electricity, and it is impossible to discharge them in addition to ionization.

If a charged insulator is retained in EPA, it will radiate an electrostatic field, causing a net charge to any nearby object, thus increasing the risk of ESD damage to the product. Although many manufacturers try to prevent insulation materials from their EPA, this method is difficult to implement. Insulating materials are too much part of everyday life – from operators’ comfortable foam mats to plastic covers.

Because of the use of ion generators, manufacturers can accept the fact that some insulating materials appear in their EPA. Since ion generation systems continuously neutralize any charge accumulation that may occur on insulators, they are a reasonable investment for any ESD program.

There are two forms of ion generating equipment in standard electronic assembly:

* Desktop type (single fan)

* Overhead equipment (with a series of fans in a single over top unit).

There are also indoor ion generators, but they are mainly used for cleaning rooms.

To use which one depends on the size of the protected area. Desktop ion generators will cover a single working surface, while overhead ion generators will cover two or three. Another advantage is that the ion generator can also prevent dust from sticking to the product and may degrade the appearance.

However, without proper testing and monitoring of the effectiveness of ESD devices, no protection plan is perfect. First-class ESD control and ionization experts report examples of manufacturers using failed (and therefore useless) ESD devices without knowing their failure.

To prevent this, in addition to standard ESD equipment, ESD vendors also provide a variety of constant monitors, which automatically alarm if a performance exceeds the requirements. The monitor can be used as an independent unit or linked together in the network. It also has an automatic data acquisition network software that displays the performance of operators and workstations in real time.

The monitor can simplify ESD plans by eliminating many routine tasks, such as ensuring proper measurements of bowl belts every day, balancing and correct maintenance of ion generators, and no damage to the worktable grounding points.


The first step in preventing ESD is to correctly evaluate how small details can cause irreparable damage if ignored. An effective plan requires not only the use of effective ESD protection equipment, but also rigorous operating procedures to ensure that all plant personnel are ESD safe.

Although many manufacturers use automatic bowl belt testers, it is common to see operators passing tests or failing because the bowl belt is too loose. Many operators attempt to pass the test by holding the tester close to the wrist with the other hand.

Nonetheless, the good news is that ESD is avoidable. The time and money invested in proper equipment and improved safety procedures will be rewarded by increasing the corresponding eligibility rate.

Electrostatic system

As an effective system for electrostatic protection, it is mainly composed of two parts: hardware and software.

The hardware part includes:

* Body electrostatic protection products

* Anti-static logistics transfer products

* Anti-static floor

* Anti-static operation system

* Anti-static earthing

Anti static grounding must be installed in the anti-static work area.

* Environmental control system

Temperature and humidity control equipment should be installed in the anti-static working area, and environmental cleanliness control system should be installed in the assembly of electrostatic sensitive devices with special requirements, so that the production environment can reach the corresponding cleanliness level.

* Special production assembly equipment

Production equipment such as mounter, Bonding, plug and pull, welding and so on should be adopted.

* Special antistatic products.

* Electrostatic measurement (monitoring) system

The software part includes:

* Training

* Antistatic technology and design documents.

* Professional standards for anti static electricity

* Operation procedures and rules and regulations

* Complete quality assurance system

* Anti-static signs

* Storage and transportation requirements

Dust-free clothes, also known as anti-static clothes, are different from ordinary work clothes. They can not be used directly in production. Many people are not aware of this. Here’s a brief introduction

Wash Before Wearing Antistatic Clearnroom Coveralls

Cleanroom clothes themselves do not collect dust and stick dust, which has played a very good effect of dust and static electricity. However, when cutting, it will produce many small threads and exposed fibers. Some fibre dust may remain in newly produced clean clothes, which affect the performance of dust-free clothes. So before cleanroom clothes are used, they need to be cleaned. In order to have better effect, there are some sensitive people who need to wash and wear again to avoid physical allergies.

Anti-static shoes are special protective shoes in special environment. They can prevent static electricity and dust. They are suitable for shoes worn in clean rooms such as biopharmaceuticals, electronics factories, aerospace, petrochemical and food factories. Sometimes they do not prevent static electricity long after they are worn. People may think they are broken. In fact,  the problem was that they don’t wear them in the right way. We need to pay attention when we use it.

Why Antistatic Shoes Don't Prevent Electrostatic Discharge

Some people like to wear socks when they wear work shoes, especially when it is cold in winter, cotton thick socks will lead to anti-static performance failure. Socks should wear thin nylon socks or conductive fiber socks, not wool or chemical fiber socks!

Cleaning is another important factor for ESD shoes. Employees need to clean and maintain after wearing them for a period of time. Cleaning is not just for employees to take home for cleaning, but for professional cleaning companies, so as to ensure its special function. Here we need to pay attention to check whether the anti-static effect is up to the standard before cleaning. If the anti-static effect is not up to the standard, it needs to be replaced immediately. Otherwise, it is a waste of money to wash out the non-wearable.

Antistatic clothing is made of special anti-static clean fabric. The fabric is made of special polyester filament and warp or zonal woven conductive fibers. It has the characteristics of high efficiency, permanent antistatic and dustproof, thin and smooth texture.

In the process of making garments, special sewing machine is used to reduce the production of particles effectively. The dust-free adhesive tape avoids the environmental pollution caused by lint come off. According to the level requirements, different styles are provided, and conductive fibers are sewn to keep the electrical continuity of each part of the garment; sleeves & trouser legs are special double-layer structure, and the inner layer uses conductive or anti-static ribs to meet the requirements of high-level dust-free environment.

Answered: Your Most Burning Questions About Antistatic Clothing

  • Description
  • Scope of use
  • Use of fabric
  • Environmental requirements
  • Do’s and don’ts
  • Maintenance
    • Packaging & storage
    • Preservation
  • Measurement references
  • Principle of ESD
  • Cleaning procedures
  • Antistatic standards in China

Antistatic Garment Description

Anti-static clothing is made of anti-static and dust-proof fabric (commonly known as conductive silk), which is made of special polyester filament and high-performance permanent conductive fiber by special technology. It has excellent and lasting anti-static and dust-proof function and can effectively release human static charge.

Scope of use

Suitable for microelectronics, photoelectricity, solar energy, medicine, bioengineering, food, cosmetics, petrochemical, military and other industries which are more sensitive to electrostatic micro-dust and require higher cleanliness.

Size Chart
Note: It may be customized with 5mm stripe, 5mm grid, 2.5mm grid material,  knitting techniques and other specifications are also customizable.
Color: White, blue, red, yellow, green, pink etc.

Use of fabric

The use of stainless steel fibers, sub-conductive fibers, anti-static synthetic fibers and polyester-cotton blended or blended fabrics, can
  • automatically corona discharge or leakage discharge
  • eliminate clothing and human static electricity,

in addition to clothing, they can also be used to make anti-static hats, socks, shoes and so on. In China, the performance index conforms to the GB12014-89 standard: the charge density of cloth is less than5μC

Environmental Requirements

Relative humidity less than 30%, the charge quantity of pure cotton clothing is relatively lower than that of chemical fiber clothing , anti-static clothing made of sub-conductor material should be worn in high-voltage work place; do not take off the clothes in flammable and explosive spaces; do not wear any accessories or metal items on anti-static clothing; when wearing anti-static clothes, you should also wear antistatic clothing stipulated in GB4385. Including but not limited to electrostatic shoes, ESD caps, anti-static gloves.

Do’s and Don’ts

  1. Anti-static clothing should be worn when the minimum ignition energy of combustibles is below 0.25 mJ under normal situation, where explosive gas mixtures continue to emerge or exist frequently in a short time or for a long time, and where explosive gas mixtures are likely to appear.
  2.  Do not put on or take off  in flammable and explosive spaces.
  3. Do not wear any accessories or metal objects with anti-static clothing.
  4. When wearing anti-static clothes, they should also be matched with anti-static shoes. At the same time, the ground should be anti-static floor and have a grounding system as well.
  5. Anti-static clothing should be neat and confirmed antistatic. After use, it should be washed with soft brush or wash with soft cloth dipped in neutral detergent, do not destroy the fabric.
  6. Anti-static work clothes should be cleaned with neutral detergent. When washing, do not mix with other clothes. Hand-washing or washing machine soft-washing procedures should be adopted to prevent the breakage of conductive fibers.
  7.  After wearing for a period of time, anti-static clothing should be tested. If the electrostatic performance does not meet the requirements, it can no longer be used as anti-static clothing.
  8. Do not put on or remove static clothing in places with danger of fire and explosion.
  9. Do not attach or wear metal objects with antistatic clothing in hazard places of fire and explosion.
  10. Outer clothing should completely cover the inner garments. The split jacket should cover the waist of the waistband.
  11.  When wearing anti-static clothing in fire and explosion hazardous locations, you should also wear anti-static shoes stipulated by relevant national standards.
  12.  Anti static clothing should be kept clean and antistatic. After use, brush with soft brush or soft cloth dipped in neutral detergent, ensuring not to damage the cloth fiber.


Packaging & Storage

In transportation, it should be noted that there must be a cover on the anti-static work clothes, and that the packaging should not be damaged so that it can prevent sun and high temperature contact. Dragging with hooks is strictly prohibited during handling.
Antistatic work clothes should be stored in dry and ventilated warehouses to prevent mildew and rot. During storage, keep a distance of 200mm from floor and walls and 1m away from all heating items . Direct sunlight should be avoided and outdoor placement prohibited.
Appropriate moth proofing measures should be taken when packaging and storing wool knitted antistatic clothing.


Anti-static work clothes should be cleaned with neutral detergent. Do not mix with other clothes. Hand washing or washing machine soft washing procedures should be adopted to avoid the damage of conductive fibers. Washing water temperature should be below 40 degrees Celsius, rinse with normal temperature. The washing period is as short as possible, but must be rinsed sufficiently to remove residual detergent. Antistatic work clothes with flame retardant and oil proof properties shall not be used with bleach or organic solvents for decontamination.

Measurement References

GB 1335 Clothing size series
GB 2668 Men’s and women’s single coat specifications series
GB 2669 Men’s and women’s trousers specifications series
GB 2828 Batch by lot inspection sampling procedure and sampling table (for continuous batch inspection)
GB 3923 Determination of breaking strength and breaking elongation of woven fabric (strip method)
GB 4288 Household electric washing machine
GB 4385 Antistatic rubber soles and conductive rubber soles before safety technology

Principle of ESD

(1) First of all, anti-static clothing is a kind of clothing sewn with anti-static fabric to prevent the accumulation of static electricity on clothing. Antistatic fabrics are fabrics that are alternately or evenly blended with conductive fibers or antistatic synthetic fibers or both at equal intervals during weaving.
(2) Conductive fibers refer to all or part of the fibers made of conductive or sub-conductive materials of metals or organics. Their volume resistivity ρv~is between 104 and 109Ω/cm. The distribution of irradiated conductive components in the fibers can be divided into three types: conductive component homogeneous, conductive component covering and conductive component composite.
Most of the anti-static fabrics are made of conductive fibers, especially the composite type of conductive components, that is, composite fibers are most used.
(3) Anti-static work clothes made of conductive fibers are added to chemical fibre fabrics. Their power dissipation is based on two mechanisms: charge leakage and neutralization. When grounded, the static electricity on the fabric can be released to the earth through conductive fibers or being neutralized by the corona discharge of conductive fibers; when not grounded, it can be eliminated by the weak corona discharge of conductive fibers.

Cleaning Procedures

Sorting: After receiving the customer’s laundry to be sorted, stored them in a covered plastic box, to prevent aggravation of pollution.
Pretreatment: Take maintenance treatments to breakage, dropping buttons etc. Pre-decontamination should be carried out for the special dirt cleaning works.
Dust-free cleaning: Pretreated uniforms are cleaned by a special channel structure washing machine in the non-control area first, then they enter the control area (clean room).
Dust-free drying: Cleaned and purified uniforms are dried in the clean room by a dust-free dryer (the drying hot air used is filtered by HEPA).
Folding inspection: Fold the dry clean clothes, and the appearance inspection is carried out at the same time. If it fails to pass the inspection, it should be put back into the cleaning process to clean or be replaced.
Cleanliness test: Helmke Drum tester, which can test the number of dust particles in cleanliness grade of cleaned uniforms
ESD test: ESD performance check to ensure the anti-static performance of the cleaning garment.
Purification Packaging: Through all the inspection of the purified uniforms, after the purification packaging bag sealed packaging, it will become a qualified product.

Antistatic Standards in China

I. Standard scope:
This standard specifies the technical requirements, testing methods, inspection rules and identification of antistatic clothing.
This standard is applicable to antistatic clothing that may be used in electric shock, fire and explosion hazardous places.
The antistatic clothing defined in this standard does not apply to the power supply voltage resistence.
Standard number: GB 12014-2009
Chinese term: fáng jìng diàn fú(instead of standard number: GB 12014-1989 antistatic clothing).

II. Terms and definitions
The following terms and definitions apply to this standard.

Static protective clothing
In order to prevent the accumulation of static electricity on clothing, anti-static fabrics are used as fabrics, and the work clothes are sewn according to the prescribed style and structure.

Static protective fabric
When weaving, a fabric made of yarn blended with conductive fibers or woven with conductive filaments can also be treated and protected fabric with electrostatic properties.

Conductive fiber
All or part of the conductive material made of metal or organic materials or fibers made of static dissipative material.

Electrostatic Dissipative Material
The surface resistivity is greater than or equal to 1 x 10^5 ohms but less than 1 * 10^11 ohms.

Surface resistivity
A physical quantity representing the electrical conductivity of an object.

Point to point resistance
In a given time, the ratio of the applied current and voltage between the two electrodes on the surface of the material to the DC current flowing through them is applied.

III. Technical requirements:
1) Fabric:
– Appearance quality: It is required that the fabric should be free from damage, spots, dirt or other defects affecting the anti-static performance of the fabric.
– Testing parameters: fabric is tested by point to point resistance method, and the technical parameters are shown in the following table.

Test project
Technical requirements
Class A
Class B
Point to point resistance/Ω
1 x 10—- 1 x 10
1 x 10—- 1 x 10

2) Clothing:
– Appearance quality: there should be no defects, spots, dirt and other defects affecting the wearing performance.
– Structural style: Clothing structure should be safe and hygienic, conducive to the normal physiological requirements and health of human body; clothing should be easy to wear and adapt to the physical activities of the operation; clothing style should be simple and easy to use according to the requirement of use.
– Sewing: sewing threads in all parts are straight, neat and firm. The upper and lower tightness is suitable, no jumping needle, and the needles at the landing and landing needles should be returned.
– Test parameters: antistatic clothing is measured by charged quantity test method. The technical parameters are shown in the following table.

Test project
Technical requirements
Class A
Class B
Charge quanity/(μC per item)
0.20 —- 0.60

3) Washing:

Anti static clothing and fabrics must be washed per the regulations before testing.

In recent years, more and more accidents caused by static electricity, anti-static has been paid more and more attention. With the development of economy and progress of society, almost all walks of life pay more attention to it. So anti-static shoes are getting to be known by more and more people. The production and manufacturing workers will wear them to ensure the product quality and personal safety. So how can we tackle this issue properly? Let’s take a closer look:

How to Make Antistatic Shoes Work As Expected

Wearing anti-static and dust-free shoes in the right way. This can affect the safety of production and product quality in a direct way. The right methods are:

1. When using dust-free shoes, do not wear thick wool socks and insulating insoles.

2. The use of clean shoes on antistatic floor is better.

3. Professional cleaning and resistance testing should be carried out regularly in the course of use. Don’t use them if you do not pass the test.

4. Upon storing, we should make sure that we have dry and ventilated place, without direct sunlight, in order to prolong the service life.