MIL-DTL-24688A

INSULATION, THERMAL AND ACOUSTIC ABSORPTIVE, CELLULAR POLYIMIDE FOAM

Year: 2011

Abstract: This specification covers thermal and acoustic absorptive cellular polyimide foam insulation for use on bulkheads, overheads, and ventilation ducting. This specification also covers preformed thermal pipe insulation for use on piping operating at temperatures up to 600 °F in shipboard applicationsIntended Use: Insulation as specified herein is intended for the following applications. Type I. Type I material is a general purpose insulation for thermal and acoustical applications designed to be used as a direct substitute for fibrous glass insulation on an inch for inch thickness basis. Type I material is intended as an alternative for MIL-I-742, Type II and MIL-I-22023, Type I and Type II (all classes). Type II, class 1. Type II, Class 1 material is intended for use as a thermal insulation substitute for MIL-I-742, Type I. Type II, Class 1 material is not intended for use as an acoustic material. Type II, class 2. Type II, Class 2 material is designated for use as a lightweight acoustical absorption material for overheads (exclusive of suspended ceiling system panels) and bulkheads in dry, clean shipboard spaces where moisture and water vapor barriers are not required. This material should not be used in areas such as main or auxiliary machinery rooms, galleys, or showers where moisture, petroleum products, or noxious contaminants may be absorbed by the insulation. Type II, Class 2 material is intended for use as an acoustical insulation substitute for MIL-A-23054. Type II, classes 3 and 4. Type II, Classes 3 and 4 materials are intended for use as lightweight thermal insulation to be applied to round, oval, or rectangular ducts. Type II, Classes 3 and 4 materials are not intended for use on bulkheads and overheads. Type II, class 5. Type II, Class 5 material is intended for use as a lightweight thermal insulation to be applied in spaces where the insulation may be exposed to moisture and/or oil, such as engine rooms and machinery spaces. Type III, classes 1 and 2. Type III, Classes 1 and 2 flexible pipe insulation are intended for use on hot piping operating at temperatures from 100 to 400 °F. Type III, Classes 1 and 2 flexible pipe insulation are not intended for use on bulkheads and overheads. Type III, classes 3, 4, 5, and 6. Type III, Classes 3, 4, 5, and 6 rigid pipe insulation are intended for use on hot piping operating at temperatures from 100 to 600 °F. Type III, Classes 3, 4, 5, and 6 rigid pipe insulation may be used in areas subject to high traffic. Type III, Classes 3, 4, 5, and 6 rigid pipe insulation are not intended for use on bulkheads and overheads.
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