FYI Innegra shrinkage in heat cure

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24Dave
Posts: 124
Joined: Mon Oct 03, 2011 2:14 pm

FYI Innegra shrinkage in heat cure

Post by 24Dave »

I have started to experiment with various Innegra fabrics that I have. One thing I have learned is that while you can add a 1 or 1.5 inch strip of 2 ounce plain weave under your edges only without incident, if you are covering an entire board/ski, you have to have a symmetrical layup for higher heat cures like you would with fiberglass. (I usually use carbon only and break all the symmetry rules.) I had a fabric with just 1.25 ounces of uni Innegra in it going across a deck only. With a 165-170F cure, I had shrinkage in the deck and a curved, convex base, about 1/8th inch high on each side, 27.5 cm wide snowboard. There is a table out there showing that Innegra will shrink beyond 50C or 122 F, maybe .25% at 60C or 140F and .5% shrinkage at 80C/176F. Heat was applied about 50 minutes after mixing resin so not really done as a true post cure.


table is midway down this pdf

http://www.noahsmarine.com/mmNM/Images/ ... tation.pdf
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