Significance and Use
4.1 This practice is used to measure the insulation provided by a cold weather clothing garment or garment system using a heated manikin (see Test Method ) and to predict the temperature rating for comfort at two activity levels using whole-body heat loss models.
4.1.1 The temperature rating is for an ensemble—not an individual garment. However, manufacturers want to label cold weather garments or garment systems with a temperature rating to help consumers select the product that will best meet their needs. Therefore, the insulation of a garment or garment system is measured with a standard base ensemble. Furthermore, the standard is limited to garments that cover a substantial amount of body surface area such as jackets, coats, insulated pants, coveralls, or snow suits. The temperature ratings of headwear, footwear, and handwear cannot be determined with this practice.
4.1.2 The temperature predictions determined by this standard practice are for adults only. The physiology of children is significantly different from that of adults, so a modified heat loss model needs to be used to predict the comfort of children wearing outdoor clothing.
4.1.3 The temperature ratings determined by this standard practice and listed on garment labels are only guidelines for comfort and will be affected by the garments consumers wear with them, their activity level during wear, and individual differences in the physiological characteristics of people (for example, gender, age, body mass, etc.).
1.1 This standard practice covers the determination of the temperature rating of a cold weather protective clothing garment or system of garments when worn with one of two base ensembles. It involves measuring the thermal resistance (insulation) value of a clothing ensemble (base ensemble plus the garment or garment system being evaluated) with a heated manikin in accordance with Test Method . The result is used in a heat loss model to predict the lowest environmental temperature for comfort.
1.2 The predictive model used in this standard estimates the evaporative heat loss from a person wearing cold weather clothing as opposed to measuring the evaporative resistance on a sweating manikin. If a person is active and gets overheated in a cold environment, he/she is usually able to adjust the garments to dissipate excess heat.
1.3 The temperature ratings estimated by this standard practice are guidelines for thermal comfort, determined from a whole-body heat loss model (see ). Therefore, localized cooling, discomfort, and even frostbite could still occur at extremely low temperatures because clothing insulation is not evenly distributed over the body surface. In addition, some body parts (for example, ears, fingers, toes) have a high surface area relative to their mass, and consequently lose heat at a faster rate than other parts of the body.
1.4 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.5 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.