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Old 10-17-2008
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Technical Resin Question..

I am trying to find out what the PSI peel strength is for fiberglass when using polyester resin vs. epoxy resin in the following situations.

#1 PSI shear/peel strength for secondary bond of polyester resin and cloth to older polyester GRP hull.

#2 PSI shear/peel strength for secondary bond of epoxy resin and cloth to older polyester GRP hull.

#2 Primary PSI strengths for polyester resin / fiberglass vs. epoxy/fiberglass.

I have read that Vinylester resin has a roughly 500 PSI bond strength and epoxy is, and can be, over 2000 PSI. I know polyester is less strong than vinylester but how much less is it 200 PSI? 300 PSI?? 400 PSI??
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Old 10-17-2008
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Part of the reason this may be difficult to determine accurately, is that the number of unbound styrene bonding sites in the laminate will have a strong effect on the strength of the polyester/vinylester bond. If most of the styrene bonding sites are used up, the bond will be primarily dependent on the secondary bonding or adhesive bonds, rather than the stronger chemical bonding that normally makes up a decent polyester/vinylester laminate.

IIRC, West Systems has published some numbers, but given the source, the numbers may not reflect reality. Some of the boat building books I've read also have numbers for the different types of resin and their physical characteristics.

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Originally Posted by Maine Sail View Post
I am trying to find out what the PSI peel strength is for fiberglass when using polyester resin vs. epoxy resin in the following situations.

#1 PSI shear/peel strength for secondary bond of polyester resin and cloth to older polyester GRP hull.

#2 PSI shear/peel strength for secondary bond of epoxy resin and cloth to older polyester GRP hull.

#2 Primary PSI strengths for polyester resin / fiberglass vs. epoxy/fiberglass.

I have read that Vinylester resin has a roughly 500 PSI bond strength and epoxy is, and can be, over 2000 PSI. I know polyester is less strong than vinylester but how much less is it 200 PSI? 300 PSI?? 400 PSI??
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Old 10-17-2008
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3M had done a few test but was mostly on the shear strength of different types of fillers?
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