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• Prepreg Material Time Limits (Boeing example) Uncured composite materials typically have “shelf life” limits: – How long they can be refrigerated (frozen) – How long they can out of refrigeration, uncovered – How long they can be held, under a vacuum bag, before autoclave curing Time limits are dependent on type of material. Typical example: • Supplier Inventory 110 – 730 Days Purchaser Inventory Life Varies from 280 – 1095 days (up to 3 years, dependent on material) Date of Manufacture Date of Receipt Handling Life 240 Hrs Mechanical Life 1000 Hrs End of Storage Life Autoclave Cure Start In Freezer Out of Storage Layup Complete, Bagged 17PDF Image | Composites 101 Workshop
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