ASTM F1291 is a copyable method to evaluate how effectively it reduces the loss of apparel heat. Fabrics serve as the primary obstacle between the human body and environmental conditions, making thermal insulation an important factor in rest and safety. The hot manikin test mimics the actual body position by maintaining a constant surface temperature, while the sensors measure the energy required to maintain that temperature. Unlike subjective wear tests, this method provides accurate, repeatable, and comparable results in various clothing systems. This plays an important role in guiding apparel design, ensuring user safety in extreme environments, and developing clothes for diverse business and recreational needs.
ASTM F1291 Test Method
| Manikin Preparation | A life-sized heated manikin with segmented body zones is dressed in the test clothing ensemble. |
| Environmental Control | Testing is conducted in a climate-controlled chamber, typically under still air conditions. |
| Heating Procedure | The manikin surface is heated to simulate human skin temperature (around 34°C). |
| Measurement | Sensors measure the power input required to maintain manikin temperature, which reflects heat loss through clothing. |
| Data Collection | Heat loss data are collected from individual body segments and averaged across the whole manikin. |
| Calculation | Thermal insulation values are expressed in clo units, where higher values indicate greater insulation. |
| Repetition | Multiple tests may be performed for consistency and to account for garment fit or environmental variables. |
