Abstract: The heat-insulating property of thermal protection products used on the engine′s gas cylinders is evaluated through sampling test under thermal vacuum environment. The product temperature rise which is evaluation requirement is affected seriously by the equipment and engineering process. According to the test method in the heat conductivity coefficient of the insulation material, temperature rising rate as a novel test requirement of evaluating the property of the products is acquired under the same testing process. This method can evaluate heat-insulating property accurately and objectively, and it can eliminate the interference factors in the equipment and engineering process. The heat insulating property of out-of-shape thermal protection products with non-uniform thickness also can be evaluated by the method.

Key words: Composite structure, Thermal protection, Heat-insulating property, Product test