BS EN 342-2004 pdf download.Protective clothing ENsembles and garments for protection against cold.
This BS EN 342 specifies requirements and test methods for performance of clothing ensembles (i.e. two piece suits or coveralls) and of single garments for protection against cold environment.
It does not include specific requirements for head wear, footwear and gloves intended to prevent local cooling.
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 document (including any amendments) applies.
EN 340, Protective clothing — General requirements.
EN 20811, TextIles — Determination of resistance to water penetration — Hydrostatic pressure test. EN 31092, Textiles —Determination of physiological properties — Measurement of thermal and water-vapour resistance under steady-state conditions (sweating guarded-hotplate test) (ISO 11092:1993.)
EN ISO 9237, Textiles — Determination of permeability of fabrics to air (ISO 9237:1995).
EN ISO 15831, Clothing — Physiological effects — Measurement of thermal insulation by means of a thermal manikin (ISO 15831:2004).
EN ISO 4674-1, Rubber- or plastics-coated fabrics — Determination of tear resistance — Part 1: Constant rate of tear methods (ISO 4674-1:2003).
3 Terms and definitions
For the purposes of this European Standard, the following terms and definitions apply. cold environment
environment characterized by the combination of humidity and wind at air temperature below — 5 °C NOTE See ENV ISO 11079.
3.2
garment
individual component of a clothing ensemble, the wearing of WNCI’I provides protection to the part of the body that it covers
3.8
lining
innermost material without watertight property
3.9
thermal resistance (insulation)
temperature difference between the two faces of a material divided by the resultant heat flux per unit area in the direction of the gradient, The dry heat flux may consist of one or more conductive, convective and radiant components. Thermal resistance Rd, expressed in square metres keMn per watt, is a quantity specific to textile materials or composites which determines the dry heat flux across a given area In response to a steady applied temperature gradient
3.10
water vapour resistance R.
water vapour pressure difference between the two faces of a material divided by the resultant evaporative heat flux per unit area in the direction of the gradient. The evaporative heat flux may consist of both diffusive and convective components.
Water vapour resistance Re, expressed in square metres pascal per watt, is a quantity specific to textile materials or composites which determines the “latent” evaporative heat flux across a given area in response to a steady applied water vapour pressure gradient
3.11
effective thermal insulation ‘de
thermal insulation from skin to outer clothing surface under defined conditions measured with a stationary manikin.
The effective thermal insulation value, I,,, is determined in relation to the naked body surface area. The value is given in rn2 K)W
3.12
resultant effective thermal insulation I.r
thermal insulation from skin to outer clothing surface under defined conditions measured with or calculated for
a moving manikin.
The resultant effective thermal insulation value, I,.,, is determined in relation to the naked body surface area. The value is given in m2 KJW
3.13 insulation required IREQ
required resultant thermal Insulation calculated on the basis of the thermal parameters of the environment (e.g. air temperature, mean radiant temperature, air velocity, relative humidity) and the body metabolism
NOTE See ENV ISO 11079.
3.14
resistance to water penetration WP
hydrostatic pressure supported by a material as a measure of the opposition to the passage of water through the material
4 Performance assessment and requirements
4.1 General
The ergonomic requirements of EN 340 shall be applied.
4.2 Thermal insulation, I. and I
Requirements for thermal insulation of the human body in a specific cold environment are assessed on the basis of ENV ISO 11079.
To be within the scope of this standard, the resultant effective thermal insulation ‘det shall have a minimum value of 0.310 m2 KIW, when measured in accordance with 5.1. Optionally, the effective thermal insulation ide value can be measured according to 5.1.
Thermal insulation of a clothing ensemble or garment is classified on the basis of measured insulation values. Performance of a clothing ensemble or garment in terms of preserving heat balance at normal body temperature depends on internal body heat production. Therefore the protective value of a clothing ensemble or garment is evaluated by comparing its measured insulation value and the calculated required insulation value (REQ). This comparison is the basis of Tables B.1 and B.2.
4.3 Air permeability, AP
When tested in accordance with 5.2, the air permeability AP shall be in accordance with Table 1.BS EN 342-2004 pdf download.