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Dielectric Strength and compression

Dielectric Strength and compression

Dielectric Strength and compression

(OP)
Hi,

When you have an SBR Rubber and you do a dielectric strength test on it (to ASTM D149) you get some strength for a given thickness, my question is, if you compress that, like when SBR is used as gasketing in flanges, does the dielectric strength change at all? Or is it just that it gets thinner so the gross voltage it can take reduces?

Per my current understanding, SBR is incompressible, so it shouldn't lose density when used as a gasket, so the strength rating should remain the same, can anyone confirm this? As a second question, since its incompressible then won't all standard gasket thicknesses (1/16, 1/8, 3/16) have the same result from the dielectric strength test? I can't find data to say one way or the other.

Thanks

RE: Dielectric Strength and compression

Rubbers are about as compressible as liquids. Whether the density changes when you squeeze it would depend on whether the sides are constrained or allowed to bulge out to accommodate the deformation.

Chris DeArmitt PhD FRSC CChem

www.phantomplastics.com
Consultant to the plastics industry

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