- Antistatic Shoes
- Dual Hole Slippers
- Detailed Introduction
- Testing Methods
- National Standards
- Applied Range
- Technical Requirements
It can be categorized as: antistatic shoes and antistatic slippers.
The styles of antistatic shoes can be basically divided into:
1, Low-cut shoes: medium shoe (full vamp shoes), hole (eyelet) shoes, mesh (surface) shoes, steel toe boots.
2, Sleeve boots: soft sole boots, hard sole boots.
3, Anti smashed shoes: ladle head shoes.
Dual Hole Slippers
Material: High quality PU leather (ISO9001 certified) environmental protection PU material.
Specifications: 22cm to 28cm (Size 34 to 46).
Features: Durable, decent, soft upper, easy to clean and wear.
Wearing antistatic cleaning shoes is the most effective and reliable way to release the electrostatic charge of the operator.
PU antistatic slippers are made of static dissipative material PU (polyurethane).
Introducing HAD system based on kinematics and physiology, the shoe body is light, soft, comfortable and permeable, and it is not easy to feel fatigue for a long time.
High quality and low price is a relatively economic choice. It is suitable for use in electrostatic sensitive area.
2. It is mainly applicable to all places where electrostatic hazards may occur such as combustion and explosion due to static electricity in human body (such as petroleum, chemical industry, mining, printing, rubber, medical treatment, purification, electronics, etc.)
3. Anti-static shoes and conductive shoes should not wear with insulated wool stockings and insulated insoles. Anti-static shoes should not be used as insulating shoes.
4. The place where antistatic shoes are used should be antistatic ground, and the place where conductive shoes are used should be conductive ground to achieve a good antistatic or conductive effect.
5, Anti-static shoes should be used in conjunction with antistatic clothing. Pay attention to the cleanliness, waterproof and moisture proof of the products.
6. In general, resistance test should be carried out within 200 hours during wearing. If resistance is not within the prescribed range, it can not be used as anti-static shoes. Antistatic shoes require resistance between 100K ohms and 1000M ohms.
Applications: Electronic appliances, LCD/LCM/LED, semiconductor production, instrumentation, microelectronics, pharmaceuticals, food etc.
Sole resistance: 10^6-10^9 Ω.
Size available: Size 34- Size 50 (220mm-300mm).
Material: PVC, PU, canvas, antistatic cloth, customizable upon requests.
A. Test instruments can output DC voltage 100V±2V. The measurement accuracy can be within 5%, and it can ensure that the energy consumed on the test sample is not more than 3W. The precision of the voltmeter and ammeter is 2.5 grade, and the measuring range can meet the requirement of measurement.
B. Inner electrodes are made up of steel balls with a total weight of 4KG and a diameter of 5MM. Anti oxidation treatment is necessary before use.
C. Outer electrode are copper plates. It must be treated with oxidation and cleaned with alcohol before use.
A. Sample preparation
Clean the sole surface of the shoe with ethanol. Wash the sole with distilled water and dry it according to the prescribed circumstances. To prohibit the use of organic matter will cause corrosion of the soles, swelling and deformation of organic substances. The sole surface should not be worn out. The conductive layer of 180*40MM should be laid on the clean sole and dried under the prescribed environmental conditions.
B.Measurement of resistance value of conductive coating.
The device for measuring the resistance of conductive coatings consists of three conductive metal poles with a top radius of 3MM±2MM. There are two poles with a distance of 35MM±0.2MM. And connected by metal wires. The third pole is 160MM±5MM from the other two pillars, and are insulated from the other two pillars.
Put the shoes coated with conductive layer on the specified metal posts. The forefoot part of the shoes should be placed on two pillars 35MM apart, and the heel part on the third pillar. All three pillars must be in contact with the conductive coating. Then, the resistance between the front two columns and the third column is measured with the prescribed test instrument. The resistance value must be less than 1KΩ by measuring the circuit principle.
3. Test conditions for antistatic shoes.
Environmental requirements: temperature 20℃±2℃; relative humidity: 30%±3%.
A. Test samples shall be placed for more than 24 hours under environmental conditions.
B. If the test cannot be carried out in the prescribed environment, the test must be completed within 5 minutes after the test sample is removed from the environment.
4. Test process for antistatic shoes
Fill the sample shoes with steel balls according to the regulations (if the upper height is not enough, all conductive steel balls can not be filled, insulating materials can be used to increase the upper height). The test sample of the steel ball is placed on the prescribed external electrode, and the prescribed DC power supply is connected between the internal and external electrodes for 1 minute. Measuring circuit principle.
Record or calculate the voltage and current value after the specified time.
2. Conductive shoes and anti-static shoes should be maintained after use, and a test of resistance value of shoes should be carried out after a period of time. If the test does not meet its standard, it can not continue to be used and needs to be updated in time.
Antistatic shoes and conductive shoes belong to two different safety shoes with following different functions:
1. Anti-static shoes should be used with anti static clothing, so that it can effectively prevent static electricity.
2. Conductive shoes and anti-static shoes can not be used with insulating insoles. These two kinds of safety shoes do not match their functions.
3. Antistatic shoes can prevent electric shocks below 250V, while conductive shoes must never be used in electric shock places.
4. Anti-static shoes must not be used as insulating shoes.
5. Conductive shoes and anti-static shoes are used in different ground environments. Anti-static shoes are used in anti-static ground, and conductive shoes are used in conductive ground.
Technical requirements for.GB4385 – 1995 antistatic shoes and conductive shoes
1. Test instrument can output DC voltage 100V±2V.
The precision of the voltmeter and ammeter is 2.5 grade, and the measuring range can meet the requirement of measurements.
A1.2 The inner electrode consists of steel balls with a total weight of 4kg and a diameter of 5mm each. Anti oxidation treatment is necessary before use.
A1.3 The outer electrode is copper. It must be treated before oxidation and cleaned with ethanol.
A2 Preparation of test samples
A2.1 Sample preparation
The sole surface of the shoes is cleaned with ethanol. Wash the sole with distilled water and dry it according to the conditions prescribed in A3.1. It is strictly prohibited to use organic substances that will cause corrosion, bloat or deformation of the soles. The sole surface should not be worn out. The cleaned sole should be coated with a conductive layer of 180 mm×40 mm as shown in Fig. A1 and dried under the environmental conditions specified in A3.1.
A 2.2.1 Device for measuring the resistance of conductive coatings consists of three conductive metal pillars with a top radius of 3 mm±0.2 mm. The two poles are 35mm±0.2mm, and are connected by metal wires. The third post is 160mm± 5mm from the middle of the other two columns, and is insulated from the other two pillars.
A2.2.2 Put the shoes coated with conductive layer on the metal column specified by A2.2.1. The forefoot part of the shoe is placed on two pillars 35 mm apart, and the heel part is placed on the third pillar. All three pillars must be in contact with the conductive coating. Then the resistance between the first two columns and the third column is measured with the test instrument specified in A1.1. The measuring circuit principle is shown in Fig. A2. The measured value must be less than 1kΩ.
European Standard EN 344:1997 “Safety, protective and occupational footwear for professional use”. The European Standard was formulated by the Technical Committee of CEN/TC61 “Foot and Leg Protection Products”, with BSI as its secretariat. This standard stipulates the structure and performance indices of safety protective shoes, such as style design, whole shoes, upper, lining, tongue, inner sole and outer sole. The test methods specified in the standard are similar to other similar standards. The principle of the method is generally applicable to most safety and anti-static protective shoes. The main indicators are as follows:
Impact resistance of Toe-cap
In the impact test with steel impact hammer of specified weight, the clearance height under the cap should be less than the specified value when the cap is impacted, and there should be no penetrating cracks in the direction of the test axis. It is noteworthy that the weight, specifications, impact height and the structure of the test machine are different in various national standards, and should be distinguished in actual testing.
Anti piercing performance
The test machine is equipped with a pressure plate, and the pressure plate is equipped with test nails. The test nail is a cutting-off tip. The hardness of the nail head should be greater than 60HRC. The sole sample is placed on the chassis of the testing machine, where the test nail can be pierced through the outer sole. The test nail pierces the sole at a speed of 10 mm/min±3 mm/min until it is pierced.
Record the maximum force required. Four points on each sole were selected for the test (at least one point on the heel). Each point was not less than 30 mm apart, and the distance from the edge of the inner sole was more than 10 mm. The bottom of the anti-skid block should be punctured between blocks. The 2 points in the 4 points should be tested at a distance of 10-15 mm from the edge line of the planting floor. If humidity has an effect on the results, the sole should be immersed in deionized water at 20℃±2℃ for16±1 hours before testing.
After the shoe sample is adjusted in dry and wet atmosphere, the clean steel ball is filled into the shoe and placed on the metal probe device. The resistance between the first two probes and the third probe is measured by the specified resistance measuring instrument. In general, the resistance of conductive shoes should not be greater than 100K ohm; the resistance of antistatic shoes should be between 100K ohm and 100M ohm.
The standard provides for testing the anti-skid coefficient of anti-static working soles, but stipulates the design and specifications of anti-slip blocks, such as the thickness of soles, the height of anti-slip blocks and the distance from the edge of soles.
It should be stored in a dry and ventilated warehouse to prevent mildew. It should be stacked above 0.2M from the ground and wall, and 1M away from all heaters. Avoid contacting with oils, acids, alkaloids or other corrosive substances.
5.2 Valid period
From the date of production, products over 18 months should be inspected in accordance with the provisions of 5.2 of this standard, and can only be sold and used if they meet the requirements.
6. Use of antistatic shoes
A. Wearing antistatic shoes and conductive shoes without thick wool socks and insulated insoles. The place for using antistatic shoes should be anti-static floor. The place where conductive shoes should be used should be conductive ground.
B. In the process of wearing, the resistance test should not be more than 200H.
2. The place where antistatic shoes are used should be antistatic ground, and the place where conductive shoes are used should be conductive ground to achieve a good result.
3. Antistatic shoes should be used in conjunction with antistatic clothing. Pay attention to the cleanliness, waterproof and moisture proof of the products.
4. Wear resistance test should not be more than 200 hours in the wearing process.
1. Wearing places
1.1 Antistatic rubber soles
Anti-static rubber soles are mainly used to prevent burning and explosion caused by static electricity in human body (for example, some places in rubber, chemical, printing, medical, electronic and other industries). At the same time, it can also avoid the electrical shock and fire caused by electrical equipment below 250V.
1.2 It is forbidden to wear anti-static rubber sole shoes for staff who’s in danger of electric shock in maintaining power equipment or handling high-voltage electrical equipment.
2. Performance indicators
2.1 Electrical performance indicators
During the wearing period of shoes, the resistance values of anti-static and conductive rubber soles were measured according to GB4386-84 “Method of testing resistance for anti-static shoes”. The resistance of the antistatic rubber soles sole must be in the range of 0.5× 10^5 Ω to 1× 10^8Ω.
2.2 Other performance indicators
2.2.1 Other performance requirements of antistatic and conductive rubber sole shoes must meet the relevant national standards and technical requirements of footwear.
2.2.2 In the structural design and material selection of anti-static and conductive rubber soles, it is necessary to take into account that the resistance of the sole changes minimally under the influence of wear and pollution.
2.2.3 Antistatic and conductive rubber soles with special requirements (e.g. acid, alkali and oil resistance) should also meet the corresponding technical standards.
3. Wear requirements
3.1 In order to ensure the effect of eliminating static electricity, when wearing anti-static rubber soles, the resistance of the ground should not be less than 1.0×10 ^ 8Ω; and when wearing conductive rubber soles, the resistance of the ground should not be less than 1.5×10^5Ω.
3.2 During the wearing process of shoes, the soles of anti-static rubber soles and conductive rubber soles shall not be contaminated with insulating impurities.
3.3 In the process of wearing shoes, attention should be paid to avoid wearing thick socks with strong insulation or wool, as well as insulating insoles.
Anti-static shoes should not be worn with insulated wool socks and insulated insoles. Anti-static shoes should not be used as insulated shoes.
The place where antistatic shoes are used should be antistatic ground, and the place where conductive shoes are used should be conductive ground.
Antistatic shoes should be used in conjunction with antistatic clothing. Pay attention to the cleanliness, waterproof and moisture proof of the products.