Accession Number : AD0721676

Title :   Using Accelerated Hydrolytic Reversion Data to Predict Service Life of Elastomeric Potting Compounds.

Descriptive Note : Final summary rept. 15 Feb 69-28 Feb 70,

Corporate Author : WEBER STATE COLL OGDEN UTAH

Personal Author(s) : Welch,Garth L. ; Lofgreen,Louis R.

Report Date : FEB 1971

Pagination or Media Count : 32

Abstract : A method is proposed for estimating the service life of two specific potting compounds based upon reversion data obtained at high temperatures and various humidities at each temperature. Reversion was followed using the change in durometer hardness with time. This method separates the effect of the water vapor concentration from the effects of the temperature on the rate of reversion. Knowing the vapor pressure of water at each temperature, and using the Arrhenius equation to extrapolate the data obtained, a reversion time can be calculated for any desired combinations of temperature and relative humidity, including cyclic operating conditions where temperature and humidity follow a regular cycle. (Author-PL)

Descriptors :   (*EMBEDDING SUBSTANCES, *HYDROLYSIS), ELASTOMERS, AGING(MATERIALS), DEGRADATION, ACCELERATED TESTING, HUMIDITY, REACTION KINETICS

Subject Categories : Elastomers and Rubber

Distribution Statement : APPROVED FOR PUBLIC RELEASE