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  • 1
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    Characterization of Adhesives for Attaching Reusable Surface Insulation on Space Shuttle Vehicles (1973)
    In:  CASI
    Details
    Publication Date: 2014-09-09
    Description: An extensive development and testing program on adhesive systems shows that: (1) A closed cell silicone rubber sponge bonded to substrates with thin bond lines of glass filled adhesive exhibits density and modulus values approximately one third that of solid silicone adhesives; (2) utilization of glass or phenolic microballoons as fillers in silicone adhesives reduces density but increases moduli of the vulcanized materials; (3) the silicone elastomer based adhesives appear to be complex systems rather than homogeneous, isotropic materials. Tensile, shear, and compression properties plotted versus temperature verify this conjecture; and (4) constant strain-stress relaxation tests on glass-filled adhesive show that stress relaxation is most pronounced near the glass transition temperature.
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA. Ames Res. Center Symp. on Reusable Surface Insulation for Space Shuttle, Vol. 3; p 935-964
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Development of design allowables data for adhesives for attaching reusables surface insulation, addendum 1A (1973)
    In:  CASI
    Details
    Publication Date: 2019-06-27
    Description: The task consisted of conducting mechanical and thermal tests to establish design allowables data on a new room temperature vulcanizing (RTV) silicone adhesive, X3-6004. Low modulus, coupled with relatively low density and good low-temperature properties of this adhesive, places it in contention as a candidate for attaching reusable surface insulation on the space shuttle. Data obtained show that the modulus values of X3-6004 are significantly lower than those of RTV-560 and the other three adhesives characterized at test temperatures from 550 to -175 F. At -175, -200 and -270 F, the modulus of X3-6004 is approximately the same as GE RTV-560 and the other three silicone adhesives. The X3-6004 adhesive exhibits good processing properties. It has a 12 percent lower density than RTV-560. Although lower in overall strength properties as compared to the other adhesives in the program, X3-6004 has adequate adhesion to 2024T81 aluminum to compete as an adhesive for attaching reusable surface insulation. It does exhibit some tendency to revert and soften at temperatures above 350 F when in a confined area.
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-CR-128888
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Development of design allowables data for adhesives for attaching reusable surface insulation (1972)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Results are presented from tests to establish design allowables data for the following room temperature vulcanizing (RTV) silicone rubber based adhesives: (1) General Electric's RTV-560; (2) Dow Corning's 93-046; and (3) Martin Marietta's SLA-561. These adhesives are being evaluated for attaching reusable surface insulation to space shuttle structure.
    Keywords: MATERIALS, NONMETALLIC
    Type: NASA-CR-128887
    Format: application/pdf
    Location Call Number Expected Availability
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    NASA TECHNICAL REPORTS
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