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Thermal And Gamma Radiation Behavior Of Dyed Nomex Yarns

Report Number: ML TDR 64-77
Author: McGrath, Joyce C.
Corporate Author: Air Force Materials Lab Wright-Patterson AFB Ohio
Laboratory: AF Materials Laboratory
Date of Publication: 1964-04
Pages: 22
Contract: Laboratory Research - No Contract
Project: 7320
Task: 732001
AD Number: AD0601573

This program involved a comparative study of natural and dyed 100-denier yarns of Nomex (a high temperature resistant fiber formerly known as HT-1) was made to determine if the inclusion of color in the solution before fiber formation changes or affects the strength or temperature resistant properties of the yarns after exposure to temperatures up to 600F and/or gamma radiation. A variation in data was obtained between the dyed yarns and the natural color yarns; however this is believed due to a variation in the yarns and not the color process. The color sealed yarns were furnished in very small experimental quantities with zero twist while the natural yarns were furnished from a contract item and had producer's twist. At the higher temperatures, all the yarns had a tendency to become somewhat brittle and fray out. Elongation properties were more readily affected by high temperature and/or gamma radiation than the strength properties. All data obtained for the color sealed yarns, after exposure to high temperature and/or gamma radiation, indicates that the color sealing process has not adversely affected the strength and high temperature resistant characteristics of the Nomex yarns.

Lockheed Martin Missiles & Fire Control
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