This specification covers flame retardant polyurethane foams for packaging furnished as two-component liquid foam-in-place (FIP) systems (see 6.1).
The polyurethane foams and the raw materials for the foams shall be furnished in the following classes, grades and categories. Additional characteristics shall be specified by the procuring activity (see 3.3.9, 6.2 and 6.5):

       Class 1 - Rigid                   Category 1 - Conventional Strength                  Category 2 - High Strength         Class 2 - Flexible                   Grade A - (Figure 1)                  Grade B - (Figure 2)                  (Use Grade with Class 2 only)

Beneficial comments (recommendations, additions, deletions) and any pertinent data which may be of use in improving this document should be addressed to the Air Force Packaging Technology and Engineering Facility, AFMC LSO/LOP, 5215 Thurlow Street, Wright Patterson AFB OH 45433-5540, by using the Standardization Document Improvement Proposal (DD Form 1426) appearing at the end of this document or by letter.

       Class 3 - Semi-Rigid (Figure 3)

Intended Use: Materials covered by this specification are intended for use as cushioning and blocking/bracing in packages to protect equipment and items from damage by shocks or impacts incurred during shipment and handling.