Guarded Hotplate Thermal Resistance
topic
The guarded hotplate measures dry thermal resistance (Rct) by maintaining a heated plate at steady-state temperature differential above ambient while a guard ring eliminates lateral heat loss; fabric specimens are layered on the plate and total thermal resistance calculated from power input, plate area, and temperature difference.
Role
Provides the fundamental thermal insulation value (tog or clo) used in cold protective clothing standards, sleeping bag ratings, and building textile insulation specifications across ISO 11092 and EN 31092 frameworks.