Thermal Insulation Values and Temperature Ratings for Sleeping Bags
Property:Resistance to dry heat transfer (insulation value) provided by sleeping bags or sleeping bag systems
Method:ASTM F 1720 "Standard Test Method for Measuring the Thermal Insulation of Sleeping Bags Using a Heated Manikin". We also test according to military specifications.
Instrument:Thermal manikin on a cot in environmental chamber
Specimen number and size:1 regular or long sleeping bag (auxiliary products like clothing, ground pad, etc. may be tested as part of a bag system; IER has these, or a company may provide them)
Cost:$600 for 3 replications in a row on one sleeping bag
Heat transfer models are used with the insulation value to determine the lowest temperature for comfort for 8 hours of sleep. No additional charge for these calculations.
Option #1: bag tested alone
Option #2: bag system tested with clothing, pad, etc.