Radiant Heat Source Ignitability Tester ISO 5657 GB/T14523 Professional Building Product Time-to-Ignition and Critical Heat Flux Test Instrument for comprehensive flammability assessment. Product Overview The Radiant Heat Source Ignitability Tester is a precision instrument designed to evaluate the ignition characteristics of building materials according to ISO 5657 and GB/T14523 standards. This advanced testing equipment measures time-to-ignition and critical heat flux