Silicone Pressure Testing: Thermal Expansion and Solvent SwellingAuthor: Kent Larson
Company: Dow Chemical Company
Date Published: 9/17/2017 Conference: SMTA International
Measurements show that when confined samples of silicone gels and soft elastomers (low to mid-00 scale hardness) are heated, they create pressures that track closely with what would be expected from liquids, while A scale hardness silicones create pressures that more closely follow elastomer predictions. Solvent swelling in confined samples produced very similar results, though the measured data for the harder elastomers fell between the liquid and elastomer predictions. Within the limited data, it appears that the crossover between liquid and elastomer pressure generation behavior lies somewhere in the upper 00 / 1-10A hardness scales, or in the 0.2 – 0.5 MPa Young’s modulus range. Details are provided to allow for pressure generation estimates for both thermal expansion and liquid swell.
CTE, expansion, pressure, swelling
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