Prediction of Moisture Absorption in the 5 in. 54 HIFRAG Discarding Rotating Band for Various Climatic Environments,
Abstract
The equilibrium sorptions of moisture in filled and unfilled Nylon 612 were determined as a function of relative humidity. Average diffusion coefficients for these materials were determined between room temperature and 100 C. These data were used to calculate the rate of moisture uptake in the 5-in./54 HIFRAG Discarding Rotating Band for various climatic environments and laboratory exposure conditions. Simple guidelines are given which will enable the weapons engineer to predict the rate of moisture uptake for various other environments. The method outlined can also be easily extended to other similar problems. The use of protective coatings as moisture barriers was also considered. It was concluded that organic coatings are not very beneficial though a Teflon coating of 1 mil may lead to a 38% reduction in the rate of moisture uptake. An excellent moisture barrier was obtained with a 1-mil thick copper coating that was chemically deposited on the surface of the Nylon. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 03, 1977
- Accession Number
- ADA039163
Entities
People
- J. M. Augl
Organizations
- Naval Ordnance Laboratory