BINDING PROPERTIES AND OTHER CHARACTERISTICS OF SEVERAL POLYESTER RESIN BINDERS USED IN PYROTECHNIC FORMULATIONS
NAVAL AMMUNITION DEPOT CRANE IN
Pagination or Media Count:
The binding strengths of pellets subjected to tensile and shear stresses, and the burning time and candlepower of flares pressed from compound aged 0-6 hours in increments of one hour prior to pressing were determined after curing periods of 5 and 30 days. Three formulations were used, each containing the same ratio of magnesiumsodium nitratebinder but, with three different polyester resin binders. The variations in physical strength, candlepower, and burning time with respect to delay time between mixing and pressing were found to be greatest for pellets and candles containing Laminac 4110. Likewise, the physical strength of pellets containing Laminac 4110 was significantly higher than the other pellets after curing 5 days however, tests after 30 days indicated that by this time the Laminac 4116 had essentially fully cured, and now had binding properties similar to Laminac 4110. All units cured for 16 hours at 150F, and then tested after 5 days exhibited considerably higher strengths than pellets not subjected to an elevated temperature. However, tests after 30 days showed that for the Laminac binders, greater binding strength is obtained by curing at room temperature for the duration of the curing cycle.