GB 38300: Evolution and historical versions
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Protective clothing - Ensembles and garments for protection against cold
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GB 38300-2025
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Protective clothing - Ensembles and garments for protection against cold
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GB/T 38300-2019
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Basic data | Standard ID | GB 38300-2025 (GB38300-2025) | | Description (Translated English) | Protective clothing - Ensembles and garments for protection against cold | | Sector / Industry | National Standard | | Date of Implementation | 2026-09-01 | | Older Standard (superseded by this standard) | GB/T 38300-2019 | GB/T 38300-2019: Protective clothing - Ensembles and garments for protection against cold---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Protective clothing--Ensembles and garments for protection against cold
ICS 13.340.10
C73
National Standards of People's Republic of China
Protective clothing
2019-12-10 release
2020-07-01 implementation
State Administration of Market Supervision
Published by the National Standardization Administration
Contents
Foreword III
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Technical requirements 2
4.1 General requirements 2
4.2 Comprehensive effective thermal resistance 3
4.3 Air permeability 3
4.4 Hydrostatic pressure (optional) 4
4.5 Wet resistance 4
4.6 Rip Strength 4
4.7 Clothing size 4
5 Test method 4
5.1 Safety technical requirements 4
5.2 Comprehensive effective thermal resistance 4
5.3 Permeability 4
5.4 Hydrostatic pressure 4
5.5 Wet Resistance 4
5.6 Rip Strength 4
6 Identification 5
7 Information provided by the manufacturer 5
Appendix A (Informative) Conversion of Comprehensive Effective Thermal Resistance and Effective Thermal Resistance 6
Appendix B (Informative) Standard reference clothing for testing cold protective clothing 7
Reference 8
Foreword
This standard was drafted in accordance with the rules given in GB/T 1.1-2009.
This standard was proposed by the Ministry of Emergency Management of the People's Republic of China.
This standard is under the jurisdiction of the National Personal Protective Equipment Standardization Technical Committee (SAC/TC112).
This standard was drafted. Institute of Military Engineering, Academy of System Engineering, Academy of Military Sciences, 3M China Co., Ltd., Shantou
Mountain Clothing Co., Ltd.
The main drafters of this standard. Xi Yuhong, Li Chenming, Ge Yan, Wu Hanrong, Guo Yafei.
Protective clothing
1 Scope
This standard specifies the technical requirements, test methods, markings and information provided by the manufacturer of protective clothing for cold environments.
This standard applies to protective clothing used in cold environments.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest version (including all amendments) applies to this document.
GB/T 3917.4 Textiles. Tear properties of fabrics. Part 4. Determination of tearing strength of tongue specimens (double seams)
GB/T 4744 Testing and Evaluation of Waterproofing Performance of Textiles
GB/T 5453 Determination of air permeability of textile fabrics
GB/T 11048-2018 Textiles-Determination of thermal and moisture resistance under steady state conditions (evaporative hot plate method)
GB/T 13640 type of protective clothing
GB/T 18398-2001 Clothing thermal resistance test method
GB 18401-2010 National Safety Technical Specification for Textile Products
GB/T 20097-2006 General requirements for protective clothing
HG/T 2581.1-2009 Determination of tear resistance of rubber or plastic coated fabrics. Part 1. Constant speed tearing method
3 terms and definitions
The following terms and definitions apply to this document.
3.1
Synthetic temperature
Comprehensive characterization of cooling effects of air temperature and wind.
Note. The integrated temperature is measured in Celsius.
3.2
Cold environment cold
Environment with a combined temperature below -5 ° C.
3.3
Coat
Outer clothing for a full suit.
3.4
Suit ensemble
Includes two, one-piece (suit) or a combination of multiple garments.
3.5
Outershelmaterial
The outermost material of protective clothing.
3.6
Effective thermal resistance
Icle
Thermal resistance from skin to the outer surface of a single garment or suit under static conditions.
3.7
Comprehensive effective thermal resistance
Icler
Thermal resistance from skin to the outer surface of a single garment or suit under dynamic conditions.
3.8
Demand Thermal Resistance Inquired
IREQ
Calculated demand based on environmental thermal parameters (such as air temperature, average radiant temperature, wind speed, relative humidity, etc.) and human metabolism
Comprehensive effective thermal resistance.
3.9
Wet-vapourresistance
Ret
The ratio of the water vapor pressure difference on both sides of the sample to the heat flux per unit area of evaporation that passes vertically through the sample. Evaporative heat flux may be caused by diffusion and
Convection is transmitted in one or more forms.
3.10
Airpermeability; AP
Air permeability of fabric.
3.11
Hydrostatic pressure to waterpenetration
PW
The water pressure that the material can withstand water penetration.
4 Technical requirements
4.1 General requirements
4.1.1 Safety technical requirements
The basic safety technical requirements for cold environment protective clothing are shown in Table 1.
Table 1 Basic safety technical requirements for cold environment protective clothing
Project Type B Type C
Formaldehyde content/(mg/kg) ≤ 4.0 ~ 8.5 4.0 ~ 9.0
pH a 3 3
Color fastness b/level ≥
Water resistance (discoloration, staining) 3 3
Acid and sweat stain (discoloration, staining) 3 3
Alkali-resistant sweat stains (discoloration, staining) 3 3
Resistance to dry friction 3 3
Table 1 (continued)
Project Type B Type C
No smell
Decomposable carcinogenic aromatic amine dyes/(mg/kg) Banned
a Non-final products that should be subjected to wet treatment in the subsequent processing process. The pH value can be relaxed to 4.0 ~ 10.5.
b Not required for non-final products, natural colors and bleached products that need to be washed and faded; traditional hand-colored products such as tie-dye and batik are not required.
4.1.2 Ergonomic technical requirements
The design and production of cold environment protective clothing shall comply with the provisions of Chapter 4 of GB/T 20097-2006.
a) The materials and components of the protective clothing should ensure that they do not adversely affect the wearer.
b) While satisfying the protection requirements, the wearer should be as comfortable as possible.
c) Protective clothing contacting the wearer's body should avoid excessive irritation or injury caused by rough, sharp angles and protruding parts.
d) Considering the influence of external factors and the possible movements and postures of the wearer during work, the protective clothing should be designed to facilitate wearing
Wear the correct position and make sure to keep it in place during the intended use. Therefore, appropriate methods should be adopted to adapt the protective clothing
The wearer's body shape, such as. suitable adjustment structure, suitable size range.
e) Minimize the quality of protective clothing without affecting the design strength and effect.
f) The design of protective clothing should be considered to form a comprehensive protective whole with other series of protective clothing or equipment after wearing. Protective clothing and other protective clothing
Equipped with the same connection, such as the connection from sleeves to gloves, trousers to shoes, hat pockets to breathing apparatus, should provide the same level of protection.
4.2 Comprehensive effective thermal resistance
The comprehensive effective thermal resistance of clothing is divided into 4 levels, and the classification is shown in Table 2.
Table 2 Classification of comprehensive effective thermal resistance
Grade comprehensive effective thermal resistance/(m2 · K/W)
1 0.310≤Icler < 0.390
2 0.390≤Icler < 0.470
3 0.470≤Icler < 0.540
4 Icler≥0.540
4.3 Air permeability
The breathability of clothing is divided into 3 levels, and the classification is shown in Table 3. The air permeability is tested according to the method specified in 5.3.
Table 3 Permeability classification
Grade Air Permeability (AP)/(mm/s)
1 AP≤5
2 5 \u003cAP≤100
3 AP > 100
4.4 Hydrostatic pressure (optional)
The hydrostatic pressure of clothing with waterproof function is divided into 2 grades, as shown in Table 4. Hydrostatic pressure is tested in accordance with the method specified in 5.4.
Table 4 Hydrostatic pressure classification
Grade Hydrostatic Pressure (PW)/Pa
1 8000 \u003cPW≤13000
2 PW > 13000
Note. The comprehensive effective thermal resistance, air permeability, and hydrostatic pressure classification of 4.2 ~ 4.4 medium-cooled environmental protective clothing are independent of each other.It is recommended that users choose the right one according to the use of different environments.
Grade protective clothing.
4.5 Wet resistance
The total moisture resistance of multilayer clothing (excluding supporting clothing) should be less than 55m2 · Pa/W.
4.6 Rupture Strength
The tear strength of the outer fabric in the warp and weft directions should be not less than 25N.
4.7 Clothing size
The design of clothing size is implemented according to the requirements of GB/T 13640.
5 Test method
5.1 Safety technical requirements
The basic safety technical requirements for clothing are tested in accordance with the methods specified in Chapter 6 of GB 18401-2010.
5.2 Comprehensive effective thermal resistance
The effective thermal resistance of clothing is tested according to the static warming dummy method specified in GB/T 18398-2001.
Refer to Appendix A for effective thermal resistance for conversion calculations. Refer to Appendix B for the reference thermal resistance value of the supporting clothing for the effective thermal resistance test of clothing.
5.3 Air permeability
The breathability of the garment is tested in accordance with the method specified in GB/T 5453.
5.4 Hydrostatic pressure
The hydrostatic pressure of the garment is tested in accordance with the method specified in GB/T 4744.
5.5 Wet resistance
The moisture resistance is tested in accordance with the method specified in GB/T 11048-2018.
5.6 Rupture Strength
5.6.1 Fabrics whose surface is not coated with rubber or plastic shall be tested in accordance with the method specified in GB/T 3917.4.
5.6.2 The fabric coated with rubber or plastic shall be tested according to the method specified in Method A of HG/T 2581.1-2009. Test speed is
(100 ± 10) mm/min.
6 Identification
The cold environment protective clothing shall have a clear and easily identifiable permanent identification, and the identification shall be consistent with the requirements of GB/T 20097-2006. Content to
Should include.
a) Product name and type;
b) implementation standards;
c) effective thermal resistance level;
d) breathability level;
e) Hydrostatic pressure level;
f) production date;
g) Manufacturer's name, site and production date.
7 Information provided by the manufacturer
The instructions provided by the protective clothing should be consistent with GB/T 20097-2006, and the following information should also be provided.
a) product name;
b) information on wearing, washing, storage, etc. required during use;
c) basic usage information, description of typical usage scenarios, such as the use temperature and the source of detailed information;
d) the use of identification information;
e) If the thermal resistance of the jacket is related to the underwear, a detailed description of the underwear (such as a product identification code) is required;
f) Warnings of misuse are required.
Appendix A
(Informative appendix)
Conversion of comprehensive effective thermal resistance and effective thermal resistance
The comprehensive effective thermal resistance can be converted by the effective thermal resistance measured by the static dummy. The conversion method is as follows.
When v = 0.4m/s ~ 2.0m/s.
Itr/It = 0.54 × e (-0.15v-0.22v1) 0.5 (A.1)
When v = 2.0m/s ~ 18.0m/s.
Itr/It = 0.54 × e (-0.15v-0.22v1) × p0.075-0.06ln (AP) 0.5
(A.2)
The effective range of formula (A.1) and formula (A.2). v1 = 0m/s ~ 1.2m/s; AP = 1mm/s ~ 1000mm/s.
Where.
Itr --- The integrated overall effective thermal resistance from the skin to the environment (including clothing and air boundary layers), the unit is square meters per watt (m2 ·
K/W);
It --- the overall thermal resistance of the clothing from the skin to the environment, including clothing and the air boundary layer, using a static dummy according to GB/T 18398-2001
Measured in square meters per watt (m2K/W);
v --- air velocity in meters per second (m/s);
v1 --- walking speed in meters per second (m/s);
AP --- Permeability, unit is millimeter per second (mm/s).
Effective thermal resistance and comprehensive effective thermal resistance are calculated according to formula (A.3) and formula (A.4).
Icle = It-Ia (A.3)
Icler = Itr-Iar (A.4)
Where.
Icle --- effective thermal resistance in square meters per watt (m2K/W);
Icler --- Comprehensive effective thermal resistance in square meters per watt (m2K/W);
Ia --- Thermal resistance of static air boundary layer, measured by static dummy, the unit is square meter per watt (m2K/W);
Iar --- the dynamic air boundary layer thermal resistance, the unit is square meter per watt (m2K/W);
Appendix B
(Informative appendix)
Standard Reference Clothing for Cold Environment Protective Clothing Testing
Refer to Table B.1 for the reference thermal resistance values of single garments for cold environment protection testing.
Table B.1 Thermal resistance values of individual garments
Serial clothing
Thermal resistance Rct/(m2 · K/W)
(Allowable error ± 10%)
1 Long Sleeve T-Shirt (Underwear Top) 0.060
2 Autumn pants (underwear pants) 0.060
3 socks (to the knee) 0.053
4 Booties 0.189
5 Thermal jacket 0.100
6 Warm trousers 0.100
7 Knitted gloves 0.082
8 headgear 0.060
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