THE EFFECT OF HYDROCARBON FILL FLUIDS ON 5109S NEOPRENE AND QXA 3770 FLUOROCARBON RUBBERS

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Authors
  1. Hiltz, J.A.
  2. Keough, I.A.
Corporate Authors
Defence Research Establishment Atlantic, Dartmouth NS (CAN)
Abstract
The chemical resistance of two elastomers, 5109S neoprene rubber and QXA 3770 fluorocarbon rubber, to three hydrocarbon-based buoyancy fluids has been assessed by monitoring weight gain and dimensional changes of rubber samples immersed in the fluids. The neoprene rubber absorbed approximately 7%, 20% and 20% by weight Bayol 35, Voltesso 35 and Marcol 72 respectively. The dimensions of the neoprene rubber also increased following immersion in the fluids. The fluorocarbon elastomer absorbed less than 0.15% by weight of the fill fluids, and did not swell following immersion in the fluids. Dynamic mechanical analysis was also used to monitor changes in the properties of the elastomers following immersion. The glass transition temperature (Tg) of the neoprene rubber samples decreased by 15 to 20 degrees following immersion in the fill fluids. Changes is the Tg of the fluorocarbon rubber following immersion were considerably smaller than those observed for the neoprene rubber. The results indicate that the fluorocarbon rubber has good chemical resistance to the fill fluids while the neoprene rubber does not. However, the dynamic properties of the fluorocarbon rubber indicate that it should not be used for low temperature, high frequency applications if rubber-like properties are required.
Keywords
Boots;Fill fluids;Neoprene rubber;Fluorocarbon rubber;Dimensional stability
Report Number
DREA-TM-98-203 — Technical Memorandum
Date of publication
01 Jan 1998
Number of Pages
29
DSTKIM No
98-02275
CANDIS No
509142
Format(s):
Hardcopy;Document Image stored on Optical Disk

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