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New Service Bulletin: 'Chute Hatch

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Based on my Flight Design composite training I agree with Corey on this. Flox is used when you want to add strength to the resin, and Cab-o-sil is just a thickening agent used to keep the resin from running.

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Above 3:1 ratio (if I recall correctly), usually any additives weaken the ability to create a bond, but flox is basically small fibers which increase the strength before it decreases. Cab-o-sil on the otherhand is silicate particles and functions similarly to microballoons, and as tom said, it keeps it from running, but to compound on that, it also serves to make filler material lighter but weaker except in compression.

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Flox gives a little bit more tensile strength in the right ratios. Chopped fibers even more so (flox is tiny chopped fibers). The fibers stop a single shear line from forming in the epoxy.

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