- Author
-
Krasny, J. F.
|
Schwartz, A. M.
- Title
- Nomex Ultraviolet Inhibitors. Final Report. April 1970-September 1972.
- Coporate
- Gillette Company Research Inst., Rockville, MD
- Sponsor
- Aeronautical Systems Division, Wright-Patterson AFB, OH
- Report
-
ASD-TR-72-104
December 1972
30 p.
- Distribution
- Available from National Technical Information Service
- Contract
- F33657-70-C-0858
- Keywords
-
nomex fabrics
|
ultraviolet inhibitors
|
parachutes
|
degradation
- Identifiers
- harness webbing; parachute pack cover fabric; actinic degradation
- Abstract
- Investigation has been made of several systems intended to improve the resistance of Nomex fabric and webbing to actinic degradation. All of these consisted in applying to the Nomex a material that absorbs actinic radiation in the range 360 - 390 nm, which is known to be the wavelength involved in the photochemical degradation. Several materials are available that meet this primary requirement, but relatively few meet the added requirements of stability, safety in application and use, and lack of undersirable effects on the fabric. A major problem proved to be the durable and satisfactory bonding of the protective material to the Nomex. Best results were obtained by applying a pigment that was opaque to the harmful radiation (carbon-black) in a lacquer type polymeric "tie-coat" or binder. A vinyl resin was used as the major ingredient of the tie-coat. As a stipulated part of this investigation a complete survey was made of the technical literature relating to actinic degradation of polyamides. This is included as an appendix.