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National Standard Detailed Rules for Anti-static Work Clothing (GB12014-2009)
1 Scope
This standard specifies the technical requirements, test methods, and inspection rules for anti-static clothing , logo, etc.
This standard applies to anti-static clothing worn in places that may cause electric shock, fire and explosion hazards.
The anti-static clothing defined in this standard is not suitable for resisting power supply voltage.
2? Normative reference documents
The provisions in the following documents become provisions of this standard through reference in this standard. For dated reference documents, all subsequent amendments (excluding corrigenda) or revisions do not apply to this standard. However, parties to an agreement based on this standard are encouraged to study whether the latest versions of these documents can be used. Version. For undated referenced documents, the latest edition applies to this standard.
GB/T 2912.1-1998 Determination of formaldehyde in textiles Part 1: Free hydrolyzed formaldehyde (water extraction method)
GB/T 3920 Color fastness test of textiles Color fastness to rubbing Tensile properties of textile fabrics Part 1: Determination of breaking strength and elongation at break Sample method
GB/T 4288 Household electric washing machine
GB/T 5453-1997 Determination of air permeability of textile fabrics
GB/T 5713-1997 Textile color Fastness test Color fastness to water
GB/T 7568.5-2002 Textile color fastness test Polyacrylonitrile standard backing fabric specifications
GB/T 7573-2002 Textile water extract Determination of pH value
GB/T 8427-1998 Test for color fastness of textiles Color fastness to artificial light: xenon arc
GB/T 8628-2001 Test for determination of dimensional changes of textiles Preparation, marking and measurement of fabric specimens and garments
GB/T 8629-2001 Home washing and drying procedures for textile testing
GB/T 8630-2002 Washing and drying of textiles Determination of final dimensional changes
GB/T 13640 Labor protective clothing models
3? Terms and definitions
The following terms and definitions apply to this standard.
3.1
static protective clothing
In order to prevent the accumulation of static electricity on clothing, anti-static fabrics are used as fabrics and are made according to the specified style and structure. Sewn work clothes.
3.2
Anti-static fabric static protective fabric
During weaving, yarns spun by mixed conductive fibers or fabrics woven with conductive filaments embedded in them are also used. But fabrics that have been treated with anti-static properties.
3.3
Conductive fiber
Fibers made entirely or partially of metal or organic conductive materials or static dissipative materials.
3.4
Electrostatic dissipative material
Materials whose surface resistivity is greater than or equal to 1×105Ω/port, but less than 1×1011Ω/port .
3.5
Surface resistivity
A physical quantity that characterizes the electrical conductivity of the surface of an object.
Note: Surface resistivity is the resistance value measured between opposite sides of a square on the surface of a material, and has nothing to do with the thickness of the object and the size of the square.
3.6
Point to point resistance
In a given time, the DC voltage applied between the two electrodes on the surface of the material and the flow through these two points The ratio of DC currents between.
4 Technical Requirements
4.1 Fabric
4.1.1 Appearance Quality
The fabric should be free of damage, spots, dirt or Other defects that affect the anti-static properties of fabrics.
4.1.2 Point-to-point resistance
The fabric is tested according to the method specified in Appendix A. The point-to-point resistance should comply with the provisions of Table 1.
Table 1 Technical requirements for point-to-point resistance
4.1.3 Physical and chemical properties
The physical and chemical properties of the fabric should meet the requirements of Table 2.
Table 2 Technical requirements for physical and chemical properties
4.2 Clothing
Finished clothing fabrics should meet the technical requirements of 4.1.
4.2.1 Appearance quality
The appearance of clothing should be free of damage, spots, dirt and other defects that affect wearing performance.
4.2.2 Structure and style
4.2.2.1 Clothing structure should be safe, hygienic, and conducive to the normal physiological requirements and health of the human body.
4.2.2.2 Clothing should be easy to put on and take off and adapt to body movements during work.
4.2.2.3? Clothing styles should be simple and practical. According to the usage requirements, the following styles can be adopted (see Figure 1):
a) The "three-tight" top and bottom pants are straight-leg pants.
b) One-piece clothing and pants (or hat and feet).
c) The remaining styles are determined based on actual conditions. Figure 1 Styles of anti-static clothing
4.2.2.4 According to the clothing style and usage requirements, refer to GB/T 13640 to select the model specifications. If it exceeds the range, set it by yourself according to the grade.
4.2.3 Sewing?
4.2.3.1 The sewing lines of each part of the garment should be straight, neat, flat and firm. The upper and lower tightness is appropriate, there are no skipped stitches, broken threads, and there should be backstitching at the rising and falling stitches.
4.2.3.2? Suture needle pitch: (12~14) needles/3cm (mass per unit area ≥200g/m2), (14~16) needles/3cm (mass per unit area <200g/m2) ).
4.2.3.3 When tested according to the method specified in 5.9, the strength of clothing seams shall not be less than 100N.
4.2.4 Amount of charged charge
Anti-static clothing should be tested according to the method specified in Appendix B. The amount of charged charge should comply with the provisions of Table 3.
Table 3 Technical requirements for point charge capacity
4.2.5 Accessories
Metal accessories are generally not allowed to be used on clothing. If they must be used (such as buttons , hooks and loops, zippers), the surface should be covered, and metal accessories should not be directly exposed.
4.2.6 Lining?
Garment linings should be made of anti-static fabrics. The area of ??pockets and reinforcement cloths of non-anti-static fabrics should be less than 20% of the inner area of ??anti-static clothing. Cold-proof clothing Or special clothing should be made with a removable inner liner.
4.2.7 Dimensional change rate
Anti-static clothing should be washed according to the 6B or 6A procedures specified in GB/T 8629-2001, and hung to dry. The dimensional change rate after washing should be Comply with the requirements of Table 4.
Table 4 Technical requirements for dimensional change rate
5 Test methods
5.1 Select samples from different parts of the fabric and garment lining, according to GB/T 2912.1- 1998 specifies methods for testing formaldehyde content.
5.2? Select samples from different parts of the fabric and garment lining, and test the pH value according to the method specified in GB/T 7573-2002.
5.3 The dimensional change rate of the fabric shall be carried out in accordance with the provisions of GB/T 8628-2001 and GB/T 8630-2002. Use the 6B or 6A program in GB/T 8629-2001 to wash and hang to dry.
5.4 Select 10 samples from different parts of the fabric and garment lining, and test the air permeability according to the method specified in GB/T 5453-1997.
The color fastness of 5.5? fabric to water is tested according to the method specified in GB/T 5713-1997.
5.6? The color fastness of the fabric to dry rubbing is tested according to the method specified in GB/T 3920.
5.7 The light and color fastness of fabrics is tested according to the method specified in GB/T 8427-1998.
5.8 Fabric breaking strength is tested according to the method specified in GB 3923.1-1997.
5.9? The seam strength of finished garments is tested according to the method specified in GB 3923.1-1997. Five samples with seams in the center are cut from the weak parts of the seams of clothes and pants. The direction and force of the seams are The direction is at an angle of 90°. If the joint is made of single thread, the end lines of the joint should be knotted to prevent slipping. The test result takes the lowest value.
6 Inspection Rules
6.1 Factory Inspection
Manufacturers should conduct factory inspection of anti-static clothing batch by batch according to the production batch. See Table 5 for each test item, test sample size, unqualified classification, and judgment array.
Table 5 Factory inspection
6.2? Type inspection
Type inspection is required when one of the following situations occurs;
6.2.1? New product identification or trial production identification of old products transferred to factories;
6.2.2? When fabrics, processes, and structural designs change;
6.2.3? Production is stopped for more than When production resumes after one year;
6.2.4 Periodic inspection, once a year;
6.2.5 When the factory inspection results are significantly different from the last type inspection results;
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6.2.6 When the relevant national competent authorities put forward type inspection requirements;
6.2.7 Samples are randomly selected from the products that have passed the factory inspection by the unit that proposed the inspection or a third party entrusted to do so. The number of samples should meet the requirements of all test items.
7. Logo
7.1. Permanent logo
7.1.1 Each set (piece, strip) of clothing should have: product name, trademark (if any) 〉, model specifications, manufacturer name, grade.
7.1.2 Each set of products should be accompanied by a certificate of conformity, including: manufacturer name, factory address, contact number, production date, and standard number. /p>
7.1.3 Each set of products should be accompanied by product instructions and required marks or signs stipulated by relevant national standards or industry standards.
7.2? Product manual?
< p>The product instruction manual should include:——It is prohibited to wear or take off anti-static clothing in places with fire and explosion hazards
—It is prohibited to wear anti-static clothing in places with fire and explosion hazards. Attaching or wearing metal objects on the clothing.
——The outer layer of clothing should completely cover the inner layer of clothing. The separate top should be enough to cover the waistband of the pants and should not be exposed when bending over.
< p>——When wearing anti-static clothing in places with fire and explosion hazards, they must be worn in conjunction with anti-static shoes specified in relevant national standards.8. Packaging and storage
8.1. The product packaging should be neat, firm and undamaged according to the customer's requirements, and the product quantity should be accurate. The inner and outer packaging should be equipped with moisture-proof layers. The manufacturer's packaging inspection form should be placed in the box. The packaging inspection form should include the product name, model, batch number, and quantity. , inspector, inspection date, product name, quantity, production date, manufacturer name, and factory address are indicated on the outside of the box.
8.2 Products must not be placed together with corrosive items, and the storage location should be dry and ventilated. , the packing box should be kept at least 20mm from the wall and floor to prevent rat bites, insect infestation, and mildew.
Appendix A
(Normative Appendix)
Point to point. Resistance test method
A.1? Principle
Place the sample to be tested on an insulating flat plate, place an electrode device on it, and apply a DC voltage between the electrode devices to measure the point-to-point resistance of the sample.
A.2? Equipment
A.2.1 Test electrodes
The test electrodes are two metal cylinders with a diameter (65±5mm); the electrode material is Stainless steel or copper; the material of the electrode contact end is conductive rubber, with a hardness (60±10) (Shore A level), a thickness (6±1)mm, and a volume resistance of less than 500Ω; the unit weight of the electrode is (2.5±0.25) kg. /p>
A.2.2 High resistance meter
Measuring range of high resistance meter: 105～1013Ω;
Measurement accuracy: when ≤1012Ω, it should be ±5%; When >1012Ω, it should be ±20%.
A.2.3 Insulated tabletop
The surface resistance and volume resistance of the tabletop are greater than 1×1014Ω respectively, and its geometric peripheral dimensions are larger than the material being tested. 10cm.
The distance between electrodes is 300mm.
A.3? Washing and Humidification
The sample must be washed and humidified before testing.
A.3.1 Washing treatment
Wash according to the washing method specified in Appendix C.
A.3.2 Humidity control
After washing the sample, dry it at (60±10)℃ for 1 hour and then place it under the test environmental conditions for 6 hours.
A.4? Sample
Select five sets of test points at different positions on the anti-static fabric.
A.5? Test conditions
The test environment conditions are temperature (20±5)℃ and relative humidity (35±5)%.
Note: If tested in a non-specified test environment, the environmental conditions should be noted in the report.
A.6? Test procedure
A.6.1 Cleaning
Use a paper towel moistened with cleaning agent (such as propylene glycol or ethanol) to clean the lower surface of the electrode and Wipe the upper surface of the insulated countertop clean and allow to air dry.
Note: Propylene glycol or ethanol is flammable and toxic. Avoid splashing on skin, eyes and clothes and inhaling its vapor.
A.6.2 Test
A.6.2.1? Place the test sample face up on the insulating table or place it in the actual use state, and place the test electrode group on the sample.
A.6.2.2 Test voltage (100±5) V, test time (15±1) s. If the surface resistance is less than 105Ω, the voltage can be reduced and noted in the report. Repeat the above test process and select four more points for testing on the same sample.
A.7? Test results
Take the geometric mean of the five test values ??as the final result.
Appendix B
(Normative appendix)
Testing method of charged charge
B.1? Principle
< p>Put the sample after friction with the roller friction machine into the Faraday cylinder to measure the charge of the sample.B.2? Sample
One piece of anti-static clothing (upper or lower clothing is acceptable).
B.3? Device
B.3.1? Friction device
The technical requirements of the rotary drum friction machine should comply with the provisions of Table B.1.
Table B.1 Friction device
B.3.2? Charge test device
It consists of a Faraday cylinder and an electrostatic charge tester. Connect as shown in Figure B.1.
1——Faraday tube;
2——Electrostatic electricity tester;
3——Insulation bracket;
4— —Polyethylene tape.
Figure B.1 Charge test circuit
B.3.2.1? Faraday cylinder: two inner and outer metal cylinders, h inside is equal to 2d, h outside is equal to 2d outside, d inside is greater than or equal to 40cm, d outside is equal to d inside + 10cm.
B.3.2.2? Static electricity tester: Measuring range: 2nC～2μC, accuracy: ±1%.
B.3.2.3? Insulation bracket: polytetrafluoroethylene with insulation resistance above 1012 Ω.
B.3.2.4 Polyethylene tape: insulation resistance is above 1012 Ω.
B.4 Washing and Humidification
The sample must be washed and humidified before testing.
B.4.1? Washing treatment
Wash according to the washing method specified in Appendix C.
B.4.2 Humidity control
After washing the sample, dry it for 1 hour at a temperature of (60 ± 10)°C, and then place it under the test environment conditions for 6 hours.
B.5? Test conditions
The test environment conditions are temperature (20±5) ℃ and relative humidity (35±5)%.
Note: If tested in a non-specified test environment, the test environment conditions should be noted in the report.
B.6? Test procedure
B.6.1? Place the sample into the roller friction machine and run it for 15 minutes.
B.6.2 Put the sample directly into the Faraday cylinder automatically from the roller friction machine (or wear insulating gloves and the insulation resistance is above 1012 Ω, take it out directly, and put it into the Faraday cylinder immediately). At this time, attention should be paid to the test. The distance is more than 300mm from the human body, metal and other objects.
B.6.3? Read the reading of the electrostatic capacity tester, measured in μC.
B.6.4? Follow the procedures specified in B.6.1~B.6.3 in Appendix B and repeat the test 5 times. There should be an interval of 10 minutes between each test. Before each test, the sample and drum lining standard cloth that comply with GB 7568, 5-2002 should be discharged.
B.7? Test results
Take the average of 5 tests as the final measurement value.
Note: For lined work clothes, turn the lining outward, repeat the above test steps, and record the results in the report. Cold-proof clothing should be tested after removing the inner liner and testing the surface and lining.
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