14 CFR 25.603 - Materials.
The suitability and durability of materials used for parts, the failure of which could adversely affect safety, must -
(a) Be established on the basis of experience or tests;
(b) Conform to approved specifications (such as industry or military specifications, or Technical Standard Orders) that ensure their having the strength and other properties assumed in the design data; and
(c) Take into account the effects of environmental conditions, such as temperature and humidity, expected in service.