GB 120 14-2009 antistatic clothing

1 range?

This standard specifies the technical requirements, test methods, inspection rules, identification, etc. Antistatic clothing.

This standard is applicable to antistatic clothing worn in dangerous places that may cause electric shock, fire and explosion.

Anti-static clothing defined in this standard is not applicable to anti-power supply voltage.

2 normative reference documents

The clauses in the following documents become the clauses of this standard by reference. All subsequent modifications (excluding errata) or revisions of dated reference documents are not applicable to this standard. However, parties who have reached an agreement according to this standard are encouraged to study whether the latest versions of these documents can be used. For undated reference documents, the latest edition is applicable to this standard.

Gb/t 29 1 2.1-1998 determination of formaldehyde in textiles part1part: free hydrolysis of formaldehyde (water extraction method)

GB/T 3920 Textiles-Tests for colour fastness-Colour fastness to rubbing (GB/T3920-2008 ISO105-X12: 2001,MOD)

GB/T 3923. 1- 1997 tensile properties of textiles and fabrics part 1: determination of breaking strength and elongation at break by peeling method.

GB/T 4288 household electric washing machine

GB/T 5453- 1997 determination of air permeability of textiles

GB/T 57 13- 1997 tests for colour fastness of textiles-colour fastness to water.

Textiles-Tests for colour fastness-Specification for polyacrylonitrile standard lining fabrics

Determination of pH value of textile water extract

Textiles. tests for colour fastness. colour fastness to artificial light: xenon arc.

GB/T 8628-200 1 preparation, marking and measurement of fabric samples and clothing in the experiment of measuring dimensional change of textiles

GB/T 8629-200 1 Household washing and drying procedures for textile testing

Determination of dimensional change of textiles after washing and drying

GB/T 13640 labor protection clothing dimensions

3 Terms and definitions

The following terms and definitions apply to this standard.

3. 1

Electrostatic protective clothing

In order to prevent static electricity from accumulating on clothes, the work clothes are made of antistatic fabric and sewn according to the specified style and structure.

3.2

Electrostatic protection fabric of antistatic fabric

When weaving, the fabric woven by yarns mixed with conductive fibers or embedded with conductive wires can also be treated with antistatic treatment.

3.3

Conductive fiber

All or part of the fibers are made of metal or organic conductive materials or electrostatic dissipative materials.

3.4

Electrostatic dissipative material

Materials with surface resistivity greater than or equal to/kloc-0 /×105Ω/port, but less than/kloc-0 /×101Ω/port.

3.5

surface resistivity

A physical quantity representing the surface conductivity of an object.

Note: Surface resistivity is the resistance measured between the sides of a square on the surface of a material, which 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 ratio of DC voltage between two electrodes on the surface of the application material to DC current flowing between these two points.

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 antistatic performance of the fabric.

4. 1.2 point-to-point resistance

The fabric shall be tested according to the method specified in Appendix A, and its point-to-point resistance shall conform to the provisions in 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 shall meet the requirements in Table 2.

Table 2 Technical Requirements for Physical and Chemical Properties

test item

technical requirement

test method

Formaldehyde content/(mg/kg)

Direct skin contact ≤75

Indirect contact with skin ≤300

5. 1

pH value

4.0~9.0

5.2

Size change rate/%

+2.5 ~-2.5 (warp and weft)

5.3

Air permeability/(mm/s)

10 ~ 30 (coated fabric)

>30

5.4

Colour fastness to water/grade (discoloration, dyeing)

≥3-4

5.5

Colour fastness/grade to dry rubbing (discoloration, dyeing)

≥3-4

5.6

Colour fastness to light/grade (discoloration, dyeing)

≥3-4

5.7

Breaking strength/Newton

Meridian plane ≥780 (mass per unit area ≥200g/m2) and meridian plane ≥490 (mass per unit area < 200g/m2)

Latitude ≥ 390

5.8

4.2 clothing

The finished garment fabric shall meet the technical requirements of 4. 1

4.2. 1 Appearance quality

Clothing appearance should be free of damage, spots, dirt and other defects that affect wearing performance.

Structure and style

4.2.2. 1 Clothing structure should be safe and hygienic, which is beneficial to normal physiological requirements and health of human body.

4.2.2.2 clothing should be easy to put on and take off, and adapt to physical activities during work.

4.2.2.3's clothing style should be simple and practical. According to the use requirements, the following styles can be adopted (see figure 1):

A) The "three tight" upper and lower pants are straight pants.

B) a single piece of clothing (or hat and feet).

C) Other styles shall be determined according to the actual situation.

Figure 1 antistatic clothing style

According to the clothing style and usage requirements, 4.2.2.4 selects the size and specification according to GB/T 13640, and sets the size and specification according to the gear difference if it is out of range.

4.2.3 sewing?

4.2.3. 1 The stitches of all parts of the garment should be straight, neat and firm. The upper and lower tightness is appropriate, and there should be stitches at the needle jumping, thread breaking and needle lifting.

4.2.3.2 stitch length: (12 ~ 14) stitch /3cm (mass per unit area ≥200g/m2), (14 ~ 16) stitch /3cm (mass per unit area < 200g/m2).

4.2.3.3 shall be tested according to the method specified in 5.9, and the seam strength of the garment shall not be less than 100? n .

4.2.4 Amount of fees charged

Anti-static clothing shall be tested according to the method specified in Appendix B, and the charging amount shall comply with the provisions in Table 3.

Table 3 Technical Requirements for Integral Charge

attachment

General metal ornaments should not be used on clothes. If it must be used (such as buttons, hooks, zippers), the surface should be covered with a cover, and the metal fittings should not be exposed directly.

4.2.6 Lining?

Clothing lining should use anti-static fabric. The area of pockets and reinforcing cloth of non-anti-static fabric should be less than 20% of the internal area of anti-static clothing. Winter clothes or special clothes should be lined with detachable lining.

Size change rate

Anti-static clothing should be washed according to the 6B or 6A procedure specified in GB/T 8629-200 1, and hung for drying. The dimensional change rate after washing should comply with the provisions in Table 4.

Table 4 Technical Requirements for Size Change Rate

5 test method

5. 1 Samples were selected from different parts of fabric and garment lining, and the formaldehyde content was detected according to the method specified in GB/T 2912.1-1998.

5.2 Take samples from different parts of fabric and garment lining, and test the pH value according to the method specified in GB/T 7573-2002.

5.3 The fabric size change rate shall be implemented according to GB/T 8628-200 1 and GB/T 8630-2002, washed according to the procedure of 6B or 6A in GB/T 8629-200 1, and hung to dry.

5.4 Take 10 samples from different parts of fabric and garment lining, and conduct air permeability test according to the method specified in GB/T 5453- 1997.

5.5 The color fastness to water of the fabric is tested according to the method specified in GB/T 57 13- 1997.

5.6 The color fastness to dry rubbing of fabrics shall be tested according to the method specified in GB/T 3920.

5.7 The color fastness to light of the fabric shall be tested according to the method specified in GB/T 8427- 1998.

5.8 The fabric breaking strength shall be tested according to the method specified in GB 3923. 1- 1997.

5.9 The seam strength of finished garments shall be tested according to the method specified in GB 3923. 1- 1997. Cut five samples from the weak seam of clothes and trousers, and the seam direction should make an angle of 90 with the stress direction. If the seam is single-line, the end line of the seam should be knotted to prevent slippage. The test result takes the lowest value.

6 inspection rules

6. 1 ex-factory inspection

The production enterprise shall carry out ex-factory inspection of anti-static clothing according to the production batch by batch. See Table 5 for each test item, test sample size, unqualified classification and judgment matrix.

Table 5 Ex-factory inspection

6.2 Type inspection

Type inspection is required in the following cases:

6.2. 1 Identification of new products or trial production and finalization of old products transferred to other factories;

6.2.2 When the fabric, technology and structural design change;

6.2.3 When the production is stopped for more than one year and resumed;

6.2.4 Regular inspection, once a year;

6.2.5 When there is a big difference between the ex-factory inspection result and the last type inspection result;

6.2.6 When the relevant national competent authorities put forward the requirements for type inspection;

6.2.7 Samples shall be randomly selected from the products inspected by the inspection unit or the entrusted third party, and the number of samples shall meet the requirements of all inspection items.

Seven signs

7. 1 permanent sign

7. 1. 1 Each set (piece, strip) of clothing should have: product name, trademark (if any), dimensions and specifications, manufacturer's name and grade.

7. 1.2 each set of products shall be accompanied by a certificate of conformity, including the name, address, telephone number, production date and standard number of the manufacturer.

7. 1.3 Each set of products shall be accompanied by the product manual and the necessary signs or marks specified by relevant national standards or industry standards.

7.2 Product description?

The product description shall include:

-It is forbidden to wear and take off anti-static clothing in fire and explosion dangerous places.

-It is forbidden to attach or wear metal objects on antistatic clothing worn in fire and explosion dangerous places.

-The coat should completely cover the underwear. The split coat should be enough to cover the belt, and the belt should not be exposed when bending over.

-When wearing anti-static clothing in fire and explosion dangerous places, you must wear anti-static shoes specified in relevant national standards.

8 packaging and storage

8. 1 The product packaging shall be neat, firm and undamaged according to customer requirements, and the product quantity shall be accurate. Internal and external packaging should have moisture-proof layer. The manufacturer's packing inspection sheet is put into the box, including the product name, model, batch number, quantity, inspector and inspection date, and the product name, quantity, production date, manufacturer's name and address are indicated outside the box.

8.2 The product shall not be put together with corrosive substances, and the storage place shall be dry and ventilated. The packing box shall be more than 20mm away from the wall and ground to prevent rats from biting, moth-eaten and mildew.

Annex a

(normative appendix)

Point-to-point resistance test method

A. 1 principle

Place the sample to be tested on the insulating flat plate, put the electrode device on it, apply DC voltage between the electrode devices, and measure the point-to-point resistance of the sample.

A.2 equipment

A.2. 1 test electrode

The test electrodes are two metal cylinders with a diameter of (65 5) mm; The electrode material is stainless steel or copper; The contact end of the electrode is made of conductive rubber, with hardness of (60 10) (Shore A), thickness of (6 1) mm, and volume resistance less than 500 Ω; Unit weight of electrode (2.5 0.25) kg.

A.2.2 megohmmeter

Measuring range of megohmmeter:105 ~1013Ω;

Measurement accuracy: 5% when ≤ 10 12ω; > 10 12ω, which should be 20%.

A.2.3 insulating mesa

The surface resistance and volume resistance of the mesa are respectively greater than/kloc-0 /×1014Ω, and its geometric peripheral size is greater than the measured material 10cm. The distance between the electrodes is 300mm.

A.3 cleaning and humidity control

Before testing, the sample must be cleaned and humidified.

A.3. 1 washing treatment

Clean according to the cleaning method specified in appendix C.

A.3.2 humidity control

The cleaned sample is at (60 65438 00)℃

A.4 samples

Select five groups of test points at different positions of antistatic fabric.

A.5 test conditions

The test environment is (20 5)℃ and the relative humidity is (35 5)%.

Note: If the test is conducted in a non-specified test environment, the environmental conditions shall be indicated in the report.

A.6 test procedures

A.6. 1 cleaning

Wipe the lower surface of the electrode and the upper surface of the insulating table with a paper towel dipped in a cleaning agent (such as propylene glycol or ethanol) and 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 testing

A.6.2. 1 Put the sample face up on the insulating table or put the test electrode group on the sample in actual use.

A.6.2.2 The test voltage is (100 5) V and the test time is (151) s. If the surface resistance is less than105 Ω, the voltage can be reduced and noted in the report. Repeat the above test process and select four more tests on the same sample.

A.7 test results

Take the geometric average of five test values as the final result.

Additional record b

(normative appendix)

Test method of charged charge

B. 1 principle

Put the sample rubbed by the roller friction machine into the Faraday cage, and measure the charge of the sample.

B.2 samples

An anti-static suit (both clothes can be used).

B.3 equipment

B.3. 1 friction device

The technical requirements of the drum friction machine shall conform to the provisions in Table B. 1.

Table B. 1 friction device

B.3.2 charging amount testing device

It consists of Faraday cylinder and electrostatic quantity tester. Connect as shown in figure B. 1

1- Faraday barrel;

2- Electrostatic quantity tester;

3—— Insulating bracket;

4- Polyethylene tape.

Figure B. 1 live test circuit

B.3.2. 1 Faraday cylinder: two metal cylinders inside and outside, in which the inner H is equal to 2d, the outer H is equal to 2d, D is greater than or equal to 40cm, and the outer D is equal to D++ 10cm.

B.3.2.2 Electrostatic quantity tester: measuring range: 2nc ~ 2μ c, accuracy: 1%.

B.3.2.3 Insulating bracket: PTFE with insulation resistance above1012Ω.

B.3.2.4 Polyethylene tape: the insulation resistance is above1012Ω.

B.4 cleaning and humidity control

Before testing, the sample must be cleaned and humidified.

B.4. 1 washing treatment

Clean according to the cleaning method specified in appendix C.

B.4.2 humidity control

After cleaning, the temperature of the sample was (60℃ 65438 00)℃

B.5 test conditions

The test environment is (20 5)℃ and the relative humidity is (35 5)%.

Note: If the test is conducted in a non-specified test environment, the test environment conditions shall be indicated in the report.

B.6 test procedures

B.6. 1 Put the sample into the roller friction machine and run for 15 minutes.

B.6.2 Put the sample directly and automatically into the Faraday cage from the roller friction machine (or put on insulating gloves with insulation resistance above1012Ω, take it out directly and put it into operation immediately). At this time, it should be noted that the sample is more than 300mm away from human body, metal and other objects.

B.6.3 Read the reading of electrostatic quantity tester in μ C. ..

B.6.4 Repeat the test five times according to the procedure specified in Appendix B, B.6. 1 ~ B.6.3, and the interval between each test is 10min. Before each test, the samples conforming to GB 7568-2002 and the cylinder lining standard cloth should be de-electrified.

B.7 test results

Take the average of five tests as the final measured value.

Note: Lined overalls should turn the lining outwards, repeat the above test steps, and record the results in the report. Winter clothes should be tested after the lining is removed.