Back to results
US 5,821,284 AGranted
Durable motor insulation
AssigneeThe United States of America as represented by the Secretary of the Air Force
InventorsMark Graham, Lane Levi, Brett Clarke
Life of this patent
Estimating the term…
Abstract
Provided is an insulation for rocket motors that uses two ingredients not previously combined in such insulation before. These ingredients are ammonium sulfate and antimony oxide, which when combined, have a synergistic effect that reduces the ablation rate significantly. Such insulation also includes EPDM rubber and aramid fibers. The inventive insulation also exhibits better tear resistance and propellant-to-insulation bond peel strength, compared with prior art rocket motor insulation.
Claims5
Internal insulation for rocket motors comprising:
- a) 45-50 wt. % ethylene-propylene diene terpolymar (EPDM),
- b) 4-6 wt. % Sb.sub.2 O.sub.3,
- c) 15-18 wt. % (NH.sub.4).sub.2 SO.sub.4
- d) 1/2 to 1 wt. % aramid fibers and
- e) 1-3 wt. % t-butyl peroxide as a curative.
2 more elements
Dependencies are inferred from the claim text.