Combined heat exposure
Exposes a horizontal flame-resistant specimen to combined convective and radiant heat.
Heat flux: 84 ± 2 kW/m², approximately 2 ± 0.05 cal/(cm²·s).
ASTM F2700
Heat-transfer evaluation of FR materials under continuous heating
Requirements & test methods
ASTM F2700-26 measures unsteady-state heat transfer through flame-resistant clothing materials during continuous combined convective and radiant heat exposure.
Specimen arrangement
Measures heat transmitted through a single fabric or layered assembly in contact or spaced arrangements.
Test record: layers, exposed face, sensor arrangement and pretreatment.
Heat-transfer performance
Calculates heat-transfer performance from the calorimeter response. 1 cal/cm² = 4.184 J/cm².
Measured quantities:
| Quantity | Unit |
|---|---|
| Applied heat flux | kW/m² |
| Exposure time | s |
| Heat-transfer performance | J/cm² or cal/cm² |
Where the standard is used
Foundry
Material heat-transfer testing under combined radiant and convective exposure.
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Oil & Gas
Heat-transfer data for materials considered for industrial thermal exposure, interpreted within the applicable clothing specification.
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Electrical
Material heat-transfer testing where a separate industrial heat hazard exists.
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Welding
Material heat-transfer testing that can support a thermal-performance assessment.
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