ASTM F2732-23 pdf download – Standard Practice For Determining The Temperature Ratings For Cold Weather Protective Clothing.
Manufacturers of cold weather protective clothing want consumers to be thermally comfortable when wearing their products.Therefore,they want to indicate the amount of warmth (that is, insulation)their products will provide to consumers at the point of sale.This is often expressed as a temperature rating on product labels and in product descriptions in catalogs.A temperature rating is commonly understood to mean the lowest air temperature at which the average adult person will have an acceptable level of thermal comfort when wearing the product.Although it is not always stated on labels or in catalogs,manufacturers are assuming that consumers will wear the appropriate amount of clothing with the cold weather garments.
Heated manikins are used to measure the thermal resistance (insulation)and evaporative resistance of clothing ensembles in accordance with Test Methods F1291 and F2370,respectively.The thermal insulation value of a cold weather protective ensemble is used in heat loss models to estimate the thermal comfortofpeople in cold environments.This approach is also used for sleeping bags(see ISO 23537-1).
1.1 This established procedure is designed to ascertain the temperature rating of cold-weather protective apparel or a composite of such garments when worn in conjunction with one of two foundational ensembles. It entails assessing the thermal resistance (insulating value) of the entire clothing assembly (comprising the base ensemble and the garment or system of garments under evaluation) using a heated manikin, in line with the specifications of Test Method F1291. The derived data is then employed within a heat loss model to forecast the minimum ambient temperature at which the wearer would experience comfort.
1.2 The predictive model incorporated in this standard calculates the evaporative heat loss for an individual donning cold weather attire, rather than directly measuring the evaporative resistance on a manikin simulating perspiration. In scenarios where an individual engages in physical activity and becomes overheated in a cold setting, they typically have the ability to modify their clothing to release any surplus heat.
