An Industry Test Program for Interlayer Equivalency,
BOEING COMMERCIAL AIRPLANE CO SEATTLE WA
Pagination or Media Count:
After the announcement in 1980 that Monsanto will have to discontinue production of their interlayer Saflex PT due to the non availability of 3 GH plasticizer, an Industry team, under the auspices of the Aerospace Industries Association AIA, was formed to identify and obtain approval for a replacement interlayer. A test program was derived to examine the physical, mechanical and operational characteristics of candidate replacement materials and compare them to those of the current PVB3GH. Typical production batches of material were procured and the test program was completed by an Industry cooperative effort. The program demonstrated a high degree of equivalency and finally resulted in FAA approval of an interlayer as a general direct replacement for all existing designs of glass windshields utilizing PVB3GH interlayer in either a bird bouncing or bird bagging mode. It is believed that this is the first time a windshield materials has received FAA approval without the usual expensive certification program normally required for each design.