ISO 17492:2019
Clothing for protection against heat and flame — Determination of heat transmission on exposure to both flame and radiant heat
This document specifies a test method for measuring the heat transferred through horizontally mounted flame-resistant textile materials when exposed to a combination of convective and radiant heat. The exposure conditions are adjusted to be approximately a 50/50 mixture of pure convective heat and pure radiant heat. The total exposure heat flux is 84 kW/m2.
This test method is applicable to any type of sheet material used either as a single layer or in a multilayer construction when all structures or sub-assemblies are made of flame-resistant materials. It does not apply to materials that are not flame resistant.
This test method does not apply to the evaluation of materials exposed to any other type of thermal energy sources, such as radiant heat only or flame contact only. ISO 6942 is applicable when evaluating materials for exposure to radiant heat only. ISO 9151 is applicable when evaluating materials due to flame contact only.
NOTE Some, but not all, textiles materials can ignite and continue to burn after exposure to the convective and radiant heat produced by this test method.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Precautions
7 Sampling
7.1 Specimen dimensions
7.2 Number of specimens
8 Conditioning and testing atmospheres
8.1 Conditioning atmosphere
8.2 Testing atmosphere
9 Test procedure
9.1 Initial set up and calibration procedures
9.1.1 Initial set up of the system and alignment of burner flames
9.1.2 Initial setting of the 50/50 mix of convective and radiant heat
9.1.3 Setting the radiant heat from the lamps
9.1.4 Setting the total exposure heat flux
9.2 Sensor care
9.2.1 Sensor care
9.2.2 Sensor inspection
9.2.3 Surface reconditioning
9.3 Specimen holder care
9.4 Computer processing of data
9.5 Test specimen mounting
9.5.1 Single layer specimens
9.5.2 Multilayer assembly specimens
9.6 Test specimen exposure when both TPI and HTI(DE) are measured
9.7 Test specimen exposure when only HTI(DE) is measured
10 Expression of results
10.1 Selection of analysis method
10.2 Thermal protection index analysis method
10.2.1 Time to onset of burn injury
10.2.2 Thermal protection index
10.3 HTI(DE) analysis method
10.4 Response to convective and radiant heat exposure
11 Interlaboratory test data
12 Test report
Annex A (informative) Availability of materials
Annex B (informative) Basis of sensor calibration
Annex C (informative) Interlaboratory test data
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
6 Precautions
7 Sampling
7.1 Specimen dimensions
7.2 Number of specimens
8 Conditioning and testing atmospheres
8.1 Conditioning atmosphere
8.2 Testing atmosphere
9 Test procedure
9.1 Initial set up and calibration procedures
9.1.1 Initial set up of the system and alignment of burner flames
9.1.2 Initial setting of the 50/50 mix of convective and radiant heat
9.1.3 Setting the radiant heat from the lamps
9.1.4 Setting the total exposure heat flux
9.2 Sensor care
9.2.1 Sensor care
9.2.2 Sensor inspection
9.2.3 Surface reconditioning
9.3 Specimen holder care
9.4 Computer processing of data
9.5 Test specimen mounting
9.5.1 Single layer specimens
9.5.2 Multilayer assembly specimens
9.6 Test specimen exposure when both TPI and HTI(DE) are measured
9.7 Test specimen exposure when only HTI(DE) is measured
10 Expression of results
10.1 Selection of analysis method
10.2 Thermal protection index analysis method
10.2.1 Time to onset of burn injury
10.2.2 Thermal protection index
10.3 HTI(DE) analysis method
10.4 Response to convective and radiant heat exposure
11 Interlaboratory test data
12 Test report
Annex A (informative) Availability of materials
Annex B (informative) Basis of sensor calibration
Annex C (informative) Interlaboratory test data
Bibliography