Overage Indicator for Graphite Fiber Epoxy.
Final rept. 15 Jun 77-14 Jun 78,
WESTINGHOUSE RESEARCH AND DEVELOPMENT CENTER PITTSBURGH PA
Pagination or Media Count:
Prepreg or B-staged products are used extensively in the aerospace, electrical, and communications industries. They consist of a partially reacted mixture of monomers which have been impregnated into the reinforcement. During shipping and storage, prior to use, the reactions will continue. The amount of reaction or age of the prepreg will depend on the conditions principally, temperature and time that it has been exposed to. These conditions are often unknown. At a point in the age of the prepreg, some critical property or properties will deteriorate. This would then represent the end of the useful life of the prepreg. The critical property will often depend upon the material and the end use intended of the prepreg. The overage indicator may then be the critical property itself or some other measurement which tracks the age of the prepreg and correlates well with the loss of the critical property. The latter affords more flexibility and generality of application to many products.
- Ceramics, Refractories and Glass
- Laminates and Composite Materials