Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB 12014-2009 Static protective clothing and GB/T 23464-2009 Protective clothing — Static protective wool knitting clothing. Based on GB 12014-2009, this standard integrates some contents of GB/T 23464-2009. In addition to a number of editorial changes, the following main technical changes have been made with respect to GB 12014-2009:
——The main content of GB/T 23464-2009 Protective clothing — Static protective wool knitting clothing has been introduced;
——The requirements of fabric tear force, decomposable carcinogenic aromatic amine dyes and peculiar smell;
——The classification of static protective clothing has been canceled;
——The test details and requirements of alive electric charge and point-to-point resistance of static protective clothing have been specified;
——The instructions for using static protective clothing have been modified and supplemented.
This standard was proposed by and is under the jurisdiction of the Ministry of Emergency Management of the People's Republic of China.
Drafting organizations of this standard: Beijing Municipal Institute of Labour Protection, Rizhao Taiyangniao Trade Co., Ltd., Baoding Sanyuan Textile Technology Co., Ltd. and Shaanxi Yuanfeng Textile Technology Research Co., Ltd.
This standard replaces GB 12014-2009 and GB/T 23464-2009.
The previous edition of GB 12014-2009 is as follows:
——GB 12014-1989.
Protective clothing — Static protective clothing
1 Scope
This standard specifies the technical requirements, test methods, inspection rules and marking of static protective clothing.
This standard is applicable to static protective clothing worn in places where electric shock, fire and explosion hazards may be caused by static electricity.
This standard does not apply to non-woven static protective clothing and static protective clothing for supply voltage resistance.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced documents (including any amendments) applies.
GB/T 1335.1 Standard sizing systems for garments — Men
GB/T 1335.2 Standard sizing systems for garments — Women
GB/T 2912.1 Textiles — Determination of formaldehyde — Part 1: Free and hydrolyzed formaldehyde (water extraction method)
GB/T 3917.3 Textiles — Tear properties of fabrics — Part 3: Determination of tear force of trapezoid-shaped test specimens
GB/T 3920 Textiles — Tests for colour fastness — Colour fastness to rubbing
GB/T 3921-2008 Textiles — Tests for colour fastness — Colour fastness to washing with soap or soap and soda
GB/T 3922 Textiles ― Tests for colour fastness ― Colour fastness to perspiration
GB/T 3923.1 Textiles — Tensile properties of fabrics — Part 1: Determination of maximum force and elongation at maximum force using the strip method
GB/T 4802.3 Textiles — Determination of fabric propensity to surface fuzzing and to pilling — Part 3: Pilling box method
GB/T 5453 Textiles — Determination of the permeability of fabrics to air
GB/T 7568.5 Textiles — Tests for colour fastness — Specification for acrylic adjacent fabric
GB/T 7573 Textiles — Determination of pH of aqueous extract
GB/T 7742.1 Textiles — Bursting properties of fabrics — Part 1: Hydraulic method for determination of bursting strength and bursting distension
GB/T 8427 Textiles — Tests for color fastness — Color fastness to artificial light: Xenon arc
GB/T 8628 Textiles — Preparation, marking and measuring of fabric specimens and garments in tests for determination of dimensional change
GB/T 8629 Textiles — Domestic washing and drying procedures for textile testing
GB/T 8630 Textiles ― Determination of dimensional change in washing and drying
GB/T 17592 Textiles — Determination of the banned azo colourants
GB 18401 National general safety technical code for textile products
GB/T 20097-2006 Protective clothing — General requirements
GB/T 23344 Textiles — Determination of 4-aminoazobenzene
FZ/T 70007 Method of test for determining the underarm seam strength of knitted garments
FZ/T 80012-2012 Cleanroom garment — Test method of point-to-point resistance
3 Terms and definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
static protective clothing
work cloth made of static protective fabric according to the specified styles and structures for the purpose of reducing the electrostatic accumulation on clothing
3.2
static protective fabric
fabrics with conductive fibre or conductive filament yarn in the textile and those made of treated electrostatic dissipative materials when weaving
3.3
electrostatic dissipative material
material with surface resistivity ≥ 1 × 105 Ω/□ but < 1 × 1011 Ω/□
3.4
conductive fibre
fibre made of conductive materials or electrostatic dissipative materials in whole or in part
3.5
surface resistivity
ratio of the potential gradient parallel to the direction of current passing through the surface of the material to the current per unit width of the surface, that is, the DC resistance between two opposite sides of a square material per unit area
Note: The unit is Ω/□.
3.6
point-to-point resistance
ratio of the DC voltage applied between the two electrodes to the DC current flowing between the two electrodes within a given time
Note: The unit is Ω.
3.7
knitted fabrics
general term for a kind of fabric in which at least one set of yarns is systematically looped and sleeved in series with each other
[GB/T 5708-2001, definition 2.1]
3.8
woven fabric
fabric usually consisting of a set of warp and weft yarns perpendicular to each other, which are interwoven on a loom according to a certain rule
[GB/T 8683-2009, definition 2.1]
3.9
shoulder strap
ribbon-shaped structure or part of the shoulder of a sweater
3.10
groundable point
point on the clothing for connecting the clothing to the ground or ground wire in an appropriate way
Note: Connection points may be taken in such form of cuffs that cling to the wearer's skin, or buttons on clothing that are specially used for grounding.
4 Technical requirements
4.1 Fabric
4.1.1 Appearance quality
According to the method specified in 5.1, the fabrics shall be free from damage, spots, dirt or other defects with influence on the properties of the fabric.
4.1.2 Physical and chemical properties of woven fabrics
The physical and chemical properties of woven fabrics shall meet the requirements of Table 1. For clothing with lining, formaldehyde content, pH value and decomposable carcinogenic aromatic amine dyes shall be in accordance with those specified in Table 1.
Table 1 Technical requirements for physical and chemical properties of woven fabrics
Test item Technical requirement Testing method
Formaldehyde content/(mg/kg) ≤ 75 5.2
pH value 4.0 ~ 8.5 5.3
Decomposable carcinogenic aromatic amine dyes Banned 5.4
Peculiar smell None 5.5
Dimensional change rate/% -2.5 ~ +2.5 (warp-wise and weft-wise) 5.6
Air permeabilitya/(mm/s) Coating fabric ≥ 10 5.7
Non-coated fabric ≥ 50
Color fastness to washing /grade Discoloration ≥ 3-4 5.8
Staining
Color fastness to dry rubbing /grade (staining) ≥ 3-4 5.9
Color fastness to light /grade ≥ 3-4 5.10
Color fastness to perspiration /grade Discoloration ≥ 3 5.11
Staining ≥ 3-4
Maximum force/N ≥ 400 5.12
Tear force/N ≥ 15 5.13
Point-to-point resistance/Ω 1 × 105 ~ 1 × 1011 Annex A
a Clothing with lining and clean air suit are not covered.
4.1.3 Physical and chemical properties of knitted fabrics
The physical and chemical properties of knitted fabric shall meet the requirements of Table 2. For clothing with lining, formaldehyde content, pH value and decomposable carcinogenic aromatic amine dyes shall be in accordance with those specified in Table 2.
Table 2 Technical requirements for physical and chemical properties of knitted fabrics
Test item Technical requirement Testing method
Formaldehyde content/(mg/kg) ≤ 75 5.2
pH value 4.0 ~ 8.5 5.3
Decomposable carcinogenic aromatic amine dyes Banned 5.4
Peculiar smell None 5.5
Relaxation dimensional change ratio/% Width elongation ≤ 5 5.6
Width shrinkage ≤ 8
Length shrinkage ≤ 10
Color fastness to washing /grade Discoloration ≥ 3 5.8
Staining ≥ 3-4
Color fastness to dry rubbing /grade (staining) ≥ 3 5.9
Color fastness to light /grade ≥ 3 5.10
Color fastness to perspiration /grade Discoloration ≥ 3 5.11
Staining ≥ 3-4
Bursting strength/kPa ≥ 200 5.14
Pilling /grade ≥ 3 5.15
4.2 Clothing
4.2.1 Clothing fabric
The fabrics of finished garment shall meet the technical requirements in 4.1.
4.2.2 Structure and style
The clothes shall be easy for putting on and off and suitable for the limb’s activities in the working. For clothing of multi-layer structure, the outermost material be able to cover the inner clothing when worn. According to the method specified in 5.16, if the tester wears clothing of suitable size for activities, the clothing shall effectively cover the parts to be protected.
4.2.3 Sizing system and specification
The sizing system and specification of men's static protective clothing shall be selected according to the requirements of GB/T 1335.1, and that of women's static protective clothing shall selected according to the requirements of GB/T 1335.2.
4.2.4 Dimensional mutual deviation in symmetrical parts and unfold dimension of neckhole
The dimensional mutual deviation in symmetrical parts and unfold dimension of neckhole of knitted clothing shall meet the requirements of Table 3.
Table 3 Dimensional mutual deviation in symmetrical parts and unfold dimension of neckhole
Item Technical requirement
Sleeve length mutual deviation Long sleeve ≤ 1.0 cm
Short sleeve ≤ 0.5 cm
Mutual deviation between left and right shoulder widths With shoulder strap ≤ 0.5 cm
Without shoulder strap ≤ 1.0 cm
Armhole length mutual deviation Coats ≤ 0.5 cm
Vest ≤ 1.0 cm
Mutual deviation between high and low positions of pockets ≤ 0.5 cm
Mutual deviation between the length of trouser legs Trousers ≤ 1.0 cm
Mutual deviation in trouser leg widths Trousers ≤ 0.5 cm
Mutual deviation of trouser opening widths Trousers ≤ 0.5 cm
Unfold dimension of neckhole ≥30 cm
4.2.5 Sewing
The clothes shall be tailed to be straight, regular, flat and firm at all parts, with proper elasticity, without slip stitch and broken line and the reinforced stitching shall be used at the repeated stitching position. The stitching distance is 12 stitches/3 cm ~ 16 stitches/3 cm. According to the method specified in 5.17, the seam strength of woven fabric clothing shall not be less than 100 N, and that of crotch seat seam and underarm seam of knitted fabric clothing 75 N.
4.2.6 Accessories
The metal accessories shall not be used on the clothes, if necessary, the cover shall be used on the surface and the metal accessories shall not be exposed directly.
4.2.7 Dimensional change ratio
The static protective clothing of woven fabric shall be tested according to the method specified in 5.6, and the dimensional change ratio after washing shall be in accordance with those specified in Table 4.
Table 4 Requirements for dimensional change ratio
Test item Dimensional change ratio/%
Collar size ≥ -1.5
Bust ≥ -2.5
Coat length ≥ -3.5
Waist girth ≥ -2.0
Outseam ≥ -3.5
4.2.8 Static protective property of clothing
4.2.8.1 Where striped or grid-like conductive fibres or conductive filaments are used to achieve static protective property, the spacing of the conductive materials shall not be greater than 10 mm.
4.2.8.2 The alive electric charge shall not be greater than 0.60 μC/set, as measured by the method specified in Annex B.
4.2.8.3 After washing and humidifying the static protective clothing used as grounding measure or with grounding function according to the method specified in Annex C, the point-to-point resistance of the clothing shall be tested according to the method specified in 7.2 of FZ/T 80012-2012, and shall be 1.0 × 105 Ω ~ 1.0 × 1011 Ω. The static protective clothing with groundable point shall be tested according to the method specified in 5.18, and the resistance between each test point and groundable point of the clothing shall be 1.0 × 105 Ω ~ 1.0 × 109 Ω.
Note: In some environments, for the purpose of safety, it is necessary to reduce the charge of human body to below 0.05 μC, or reduce the electrostatic voltage of human body to below 500 V. The above industries can wear static protective clothing meeting the requirements of 4.2.8.3 according to the protection requirements, because it is difficult for static protective clothing to dissipate the charge generated by human body to below the safety limit in time by corona discharge, and the electrostatic electric field generated by friction of the inner clothing covered by static protective clothing may also cause harm to the surrounding equipment. Electric charge, as a grounding path, is transmitted to the ground from clothing and human body through wristbands and grounding wires.
5 Test method
5.1 Lay the fabric or clothing on the table top, and observe it 1.5 m away from the product under good lighting conditions. No warp break, weft break, damage and stain are allowed.
5.2 The samples are taken from the different position of the fabrics and liner for testing the formaldehyde content according to the method specified in GB/T 2912.1.
5.3 The samples are taken from the different position of the fabrics and liner for testing the pH values according to the method specified in GB/T 7573.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
5 Test method
6 Inspection rules
7 Identification
8 Packaging and storage
Annex A (Normative) Test method for point-to-point resistance
Annex B (Normative) Test method for quantity of electric charge alive
Annex C (Normative) Washing methods for woven fabrics clothing
Annex D (Normative) Washing methods for knitted fabrics clothing
Bibliography
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This standard is developed in accordance with the rules given in GB/T 1.1-2009.
This standard replaces GB 12014-2009 Static protective clothing and GB/T 23464-2009 Protective clothing — Static protective wool knitting clothing. Based on GB 12014-2009, this standard integrates some contents of GB/T 23464-2009. In addition to a number of editorial changes, the following main technical changes have been made with respect to GB 12014-2009:
——The main content of GB/T 23464-2009 Protective clothing — Static protective wool knitting clothing has been introduced;
——The requirements of fabric tear force, decomposable carcinogenic aromatic amine dyes and peculiar smell;
——The classification of static protective clothing has been canceled;
——The test details and requirements of alive electric charge and point-to-point resistance of static protective clothing have been specified;
——The instructions for using static protective clothing have been modified and supplemented.
This standard was proposed by and is under the jurisdiction of the Ministry of Emergency Management of the People's Republic of China.
Drafting organizations of this standard: Beijing Municipal Institute of Labour Protection, Rizhao Taiyangniao Trade Co., Ltd., Baoding Sanyuan Textile Technology Co., Ltd. and Shaanxi Yuanfeng Textile Technology Research Co., Ltd.
This standard replaces GB 12014-2009 and GB/T 23464-2009.
The previous edition of GB 12014-2009 is as follows:
——GB 12014-1989.
Protective clothing — Static protective clothing
1 Scope
This standard specifies the technical requirements, test methods, inspection rules and marking of static protective clothing.
This standard is applicable to static protective clothing worn in places where electric shock, fire and explosion hazards may be caused by static electricity.
This standard does not apply to non-woven static protective clothing and static protective clothing for supply voltage resistance.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced documents (including any amendments) applies.
GB/T 1335.1 Standard sizing systems for garments — Men
GB/T 1335.2 Standard sizing systems for garments — Women
GB/T 2912.1 Textiles — Determination of formaldehyde — Part 1: Free and hydrolyzed formaldehyde (water extraction method)
GB/T 3917.3 Textiles — Tear properties of fabrics — Part 3: Determination of tear force of trapezoid-shaped test specimens
GB/T 3920 Textiles — Tests for colour fastness — Colour fastness to rubbing
GB/T 3921-2008 Textiles — Tests for colour fastness — Colour fastness to washing with soap or soap and soda
GB/T 3922 Textiles ― Tests for colour fastness ― Colour fastness to perspiration
GB/T 3923.1 Textiles — Tensile properties of fabrics — Part 1: Determination of maximum force and elongation at maximum force using the strip method
GB/T 4802.3 Textiles — Determination of fabric propensity to surface fuzzing and to pilling — Part 3: Pilling box method
GB/T 5453 Textiles — Determination of the permeability of fabrics to air
GB/T 7568.5 Textiles — Tests for colour fastness — Specification for acrylic adjacent fabric
GB/T 7573 Textiles — Determination of pH of aqueous extract
GB/T 7742.1 Textiles — Bursting properties of fabrics — Part 1: Hydraulic method for determination of bursting strength and bursting distension
GB/T 8427 Textiles — Tests for color fastness — Color fastness to artificial light: Xenon arc
GB/T 8628 Textiles — Preparation, marking and measuring of fabric specimens and garments in tests for determination of dimensional change
GB/T 8629 Textiles — Domestic washing and drying procedures for textile testing
GB/T 8630 Textiles ― Determination of dimensional change in washing and drying
GB/T 17592 Textiles — Determination of the banned azo colourants
GB 18401 National general safety technical code for textile products
GB/T 20097-2006 Protective clothing — General requirements
GB/T 23344 Textiles — Determination of 4-aminoazobenzene
FZ/T 70007 Method of test for determining the underarm seam strength of knitted garments
FZ/T 80012-2012 Cleanroom garment — Test method of point-to-point resistance
3 Terms and definitions
For the purposes of this standard, the following terms and definitions apply.
3.1
static protective clothing
work cloth made of static protective fabric according to the specified styles and structures for the purpose of reducing the electrostatic accumulation on clothing
3.2
static protective fabric
fabrics with conductive fibre or conductive filament yarn in the textile and those made of treated electrostatic dissipative materials when weaving
3.3
electrostatic dissipative material
material with surface resistivity ≥ 1 × 105 Ω/□ but < 1 × 1011 Ω/□
3.4
conductive fibre
fibre made of conductive materials or electrostatic dissipative materials in whole or in part
3.5
surface resistivity
ratio of the potential gradient parallel to the direction of current passing through the surface of the material to the current per unit width of the surface, that is, the DC resistance between two opposite sides of a square material per unit area
Note: The unit is Ω/□.
3.6
point-to-point resistance
ratio of the DC voltage applied between the two electrodes to the DC current flowing between the two electrodes within a given time
Note: The unit is Ω.
3.7
knitted fabrics
general term for a kind of fabric in which at least one set of yarns is systematically looped and sleeved in series with each other
[GB/T 5708-2001, definition 2.1]
3.8
woven fabric
fabric usually consisting of a set of warp and weft yarns perpendicular to each other, which are interwoven on a loom according to a certain rule
[GB/T 8683-2009, definition 2.1]
3.9
shoulder strap
ribbon-shaped structure or part of the shoulder of a sweater
3.10
groundable point
point on the clothing for connecting the clothing to the ground or ground wire in an appropriate way
Note: Connection points may be taken in such form of cuffs that cling to the wearer's skin, or buttons on clothing that are specially used for grounding.
4 Technical requirements
4.1 Fabric
4.1.1 Appearance quality
According to the method specified in 5.1, the fabrics shall be free from damage, spots, dirt or other defects with influence on the properties of the fabric.
4.1.2 Physical and chemical properties of woven fabrics
The physical and chemical properties of woven fabrics shall meet the requirements of Table 1. For clothing with lining, formaldehyde content, pH value and decomposable carcinogenic aromatic amine dyes shall be in accordance with those specified in Table 1.
Table 1 Technical requirements for physical and chemical properties of woven fabrics
Test item Technical requirement Testing method
Formaldehyde content/(mg/kg) ≤ 75 5.2
pH value 4.0 ~ 8.5 5.3
Decomposable carcinogenic aromatic amine dyes Banned 5.4
Peculiar smell None 5.5
Dimensional change rate/% -2.5 ~ +2.5 (warp-wise and weft-wise) 5.6
Air permeabilitya/(mm/s) Coating fabric ≥ 10 5.7
Non-coated fabric ≥ 50
Color fastness to washing /grade Discoloration ≥ 3-4 5.8
Staining
Color fastness to dry rubbing /grade (staining) ≥ 3-4 5.9
Color fastness to light /grade ≥ 3-4 5.10
Color fastness to perspiration /grade Discoloration ≥ 3 5.11
Staining ≥ 3-4
Maximum force/N ≥ 400 5.12
Tear force/N ≥ 15 5.13
Point-to-point resistance/Ω 1 × 105 ~ 1 × 1011 Annex A
a Clothing with lining and clean air suit are not covered.
4.1.3 Physical and chemical properties of knitted fabrics
The physical and chemical properties of knitted fabric shall meet the requirements of Table 2. For clothing with lining, formaldehyde content, pH value and decomposable carcinogenic aromatic amine dyes shall be in accordance with those specified in Table 2.
Table 2 Technical requirements for physical and chemical properties of knitted fabrics
Test item Technical requirement Testing method
Formaldehyde content/(mg/kg) ≤ 75 5.2
pH value 4.0 ~ 8.5 5.3
Decomposable carcinogenic aromatic amine dyes Banned 5.4
Peculiar smell None 5.5
Relaxation dimensional change ratio/% Width elongation ≤ 5 5.6
Width shrinkage ≤ 8
Length shrinkage ≤ 10
Color fastness to washing /grade Discoloration ≥ 3 5.8
Staining ≥ 3-4
Color fastness to dry rubbing /grade (staining) ≥ 3 5.9
Color fastness to light /grade ≥ 3 5.10
Color fastness to perspiration /grade Discoloration ≥ 3 5.11
Staining ≥ 3-4
Bursting strength/kPa ≥ 200 5.14
Pilling /grade ≥ 3 5.15
4.2 Clothing
4.2.1 Clothing fabric
The fabrics of finished garment shall meet the technical requirements in 4.1.
4.2.2 Structure and style
The clothes shall be easy for putting on and off and suitable for the limb’s activities in the working. For clothing of multi-layer structure, the outermost material be able to cover the inner clothing when worn. According to the method specified in 5.16, if the tester wears clothing of suitable size for activities, the clothing shall effectively cover the parts to be protected.
4.2.3 Sizing system and specification
The sizing system and specification of men's static protective clothing shall be selected according to the requirements of GB/T 1335.1, and that of women's static protective clothing shall selected according to the requirements of GB/T 1335.2.
4.2.4 Dimensional mutual deviation in symmetrical parts and unfold dimension of neckhole
The dimensional mutual deviation in symmetrical parts and unfold dimension of neckhole of knitted clothing shall meet the requirements of Table 3.
Table 3 Dimensional mutual deviation in symmetrical parts and unfold dimension of neckhole
Item Technical requirement
Sleeve length mutual deviation Long sleeve ≤ 1.0 cm
Short sleeve ≤ 0.5 cm
Mutual deviation between left and right shoulder widths With shoulder strap ≤ 0.5 cm
Without shoulder strap ≤ 1.0 cm
Armhole length mutual deviation Coats ≤ 0.5 cm
Vest ≤ 1.0 cm
Mutual deviation between high and low positions of pockets ≤ 0.5 cm
Mutual deviation between the length of trouser legs Trousers ≤ 1.0 cm
Mutual deviation in trouser leg widths Trousers ≤ 0.5 cm
Mutual deviation of trouser opening widths Trousers ≤ 0.5 cm
Unfold dimension of neckhole ≥30 cm
4.2.5 Sewing
The clothes shall be tailed to be straight, regular, flat and firm at all parts, with proper elasticity, without slip stitch and broken line and the reinforced stitching shall be used at the repeated stitching position. The stitching distance is 12 stitches/3 cm ~ 16 stitches/3 cm. According to the method specified in 5.17, the seam strength of woven fabric clothing shall not be less than 100 N, and that of crotch seat seam and underarm seam of knitted fabric clothing 75 N.
4.2.6 Accessories
The metal accessories shall not be used on the clothes, if necessary, the cover shall be used on the surface and the metal accessories shall not be exposed directly.
4.2.7 Dimensional change ratio
The static protective clothing of woven fabric shall be tested according to the method specified in 5.6, and the dimensional change ratio after washing shall be in accordance with those specified in Table 4.
Table 4 Requirements for dimensional change ratio
Test item Dimensional change ratio/%
Collar size ≥ -1.5
Bust ≥ -2.5
Coat length ≥ -3.5
Waist girth ≥ -2.0
Outseam ≥ -3.5
4.2.8 Static protective property of clothing
4.2.8.1 Where striped or grid-like conductive fibres or conductive filaments are used to achieve static protective property, the spacing of the conductive materials shall not be greater than 10 mm.
4.2.8.2 The alive electric charge shall not be greater than 0.60 μC/set, as measured by the method specified in Annex B.
4.2.8.3 After washing and humidifying the static protective clothing used as grounding measure or with grounding function according to the method specified in Annex C, the point-to-point resistance of the clothing shall be tested according to the method specified in 7.2 of FZ/T 80012-2012, and shall be 1.0 × 105 Ω ~ 1.0 × 1011 Ω. The static protective clothing with groundable point shall be tested according to the method specified in 5.18, and the resistance between each test point and groundable point of the clothing shall be 1.0 × 105 Ω ~ 1.0 × 109 Ω.
Note: In some environments, for the purpose of safety, it is necessary to reduce the charge of human body to below 0.05 μC, or reduce the electrostatic voltage of human body to below 500 V. The above industries can wear static protective clothing meeting the requirements of 4.2.8.3 according to the protection requirements, because it is difficult for static protective clothing to dissipate the charge generated by human body to below the safety limit in time by corona discharge, and the electrostatic electric field generated by friction of the inner clothing covered by static protective clothing may also cause harm to the surrounding equipment. Electric charge, as a grounding path, is transmitted to the ground from clothing and human body through wristbands and grounding wires.
5 Test method
5.1 Lay the fabric or clothing on the table top, and observe it 1.5 m away from the product under good lighting conditions. No warp break, weft break, damage and stain are allowed.
5.2 The samples are taken from the different position of the fabrics and liner for testing the formaldehyde content according to the method specified in GB/T 2912.1.
5.3 The samples are taken from the different position of the fabrics and liner for testing the pH values according to the method specified in GB/T 7573.
Contents of GB 12014-2019
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Technical requirements
5 Test method
6 Inspection rules
7 Identification
8 Packaging and storage
Annex A (Normative) Test method for point-to-point resistance
Annex B (Normative) Test method for quantity of electric charge alive
Annex C (Normative) Washing methods for woven fabrics clothing
Annex D (Normative) Washing methods for knitted fabrics clothing
Bibliography
