Accession Number : ADA308410

Title :   Low-Density Foam for Insulating Liquid-Hydrogen Tanks.

Descriptive Note : Technical note,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION CLEVELAND OH LEWIS RESEARCH CEN TER

Personal Author(s) : Sumner, Irving E.

PDF Url : ADA308410

Report Date : MAR 1969

Pagination or Media Count : 53

Abstract : A lightweight polyurethane foam insulation for liquid hydrogen tanks of space vehicles was developed that could he foamed in place, did not crack when chilled to liquid hydrogen temperature, and had a thermal conductivity of 0.0137 W/(m)(K) (0.0079 Btu/(hr)(ft)(R)) at a mean temperature of 136 K (243 deg. R). The foaming-in-place technique in which the foam constituents were poured directly on the tank, coupled with the specific foam formulation, produced a 34.4-kg/cu m - (2.14-lb/cu ft) density foam that remained structurally intact during all simulated ground-hold vibration, and space-hold tests conducted. Thermophysical properties of the foam were determined, and thermal stress profiles throughout a layer of insulation were calculated.

Descriptors :   *SPACECRAFT, *THERMAL INSULATION, *EXPANDED PLASTICS, DENSITY, THERMAL CONDUCTIVITY, LIGHTWEIGHT, LOW DENSITY, LIQUID HYDROGEN, POLYURETHANE RESINS, THERMAL STRESSES, FOAM, THERMOPHYSICAL PROPERTIES.

Subject Categories : Plastics
      Unmanned Spacecraft
      Manned Spacecraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE