Resistance to heat and fire

M 31
PTL Tracking Test Apparatus

for determination of the proof (PTI) and the comparative (CTI) tracking indices of solid insulating materials

T 03
PTL Glow-Wire Test Apparatus
to determine the fire resistance by the fire hazard test

T 10
to determine the dimensional stability of parts consisting of non-ceramic,
non-metallic insulating materials when exposed to higher temperatures up to maximum 250 °C