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Institute for Environmental Research

Institute for Environmental Research

Kansas State University
64 Seaton Hall
Manhattan, KS 66506

Phone: 785-532-5620
Fax: 785-532-6642

NFPA Total Heat Loss Test


Total heat loss (from fire fighter fabrics)


ASTM 1868 "Thermal and Evaporative Resistance of Clothing Materials Using a Sweating Hot Plate Test"

THL Specification criteria are given in:

  • NFPA 1951 “Protective Ensembles for Technical Rescue Operations”
  • NFPA 1971 "Protective Clothing for Structural Fire Fighting and Proximity Fire Fighting"
  • NFPA 1977 “Protective Clothing and Equipment for Wildland Fire Fighting”
  • NFPA 1992 “Liquid Splash-Protective Ensembles and Clothing for Hazardous Materials Emergencies”
  • NFPA 1994 “ Protective Ensembles for First Responders to CBRN Terrorism  Incidents”
  • NFPA 1999 “Emergency Medical Protective Clothing”


Sweating hot plate in an environmental chamber; custom hoods provide either horizontal or vertical air flow at different levels

Specimen number and size:

3 - 20 x 20 inch squares 


$700 per fabric or fabric assembly (3 reps dry, 3 reps sweating)


Fire fighter turnout gear materials