EN ISO 6942

Material response to radiant heat

Requirements & test methods

ISO 6942 evaluates materials and assemblies exposed to radiant heat using visual and heat-transfer assessments.

Assesses charring, melting, shrinkage and other physical changes after radiant-heat exposure.

Heat flux in kW/m², exposure time in s and observed material changes.

Measures the time to 12 °C and 24 °C calorimeter rises. ISO 11612 uses 20 kW/m²; EN 469 uses 40 kW/m².

RHTI12, RHTI24 and their difference, in seconds.

Reading heat-transfer results
Quantity	Unit	Meaning
RHTI12	s	Time to a 12 °C calorimeter rise
RHTI24	s	Time to a 24 °C calorimeter rise
RHTI24 − RHTI12	s	Interval between those two measured endpoints

Radiant-heat testing of materials for work near furnaces and hot metal.

Radiant-heat testing for materials used near hot process equipment or other assessed radiant sources.

Materials for tasks near hot industrial equipment where radiant heat is a separate hazard.

Radiant-heat testing used in evaluating welding-clothing materials.

Aluminized fabrics with different bases for radiant-heat protection.

View fabric Flash fire + electric arc

Permanent multi-norm protection balanced with all-day wearer comfort.

View fabric Molten steel + iron

A lighter, more breathable answer to severe steel and iron exposure.

Tell us about the workplace hazard, garment requirements and target certification. Our technical team will help you define the right solution.