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  pb, one reason there are more reports
  Posted by: ezwater on Apr-22-13 9:32 PM (EST)
 

of delamination of Kevlar than for glass, CAP, Nylon, etc., is that Kevlar is harder to tear than other cloths. The Kevlar fibers may hang together, but they tear partly out of the resin matrix, and you may see water seepage.

Glass and carbon are rather brittle, and if their limit is exceeded, the fibers snap off and a big split may propagate through the hull. No one would call that delamination, and it isn't.

Nylon, CAP, and polypropylene are all stretchy, and resist propagating splits, but they aren't as resistant to tearing as Kevlar.

The other delamination issue is the degree to which the resin adheres to the cloth. Polypropylene is very resistant to tearing, but getting a resin that sticks to it is difficult. (See Twintex.) Some detractors of Kevlar claim that resin adhesion is poor, leading to delamination. There seems to be little published data, but I found one report that Kevlar was about 15% lower than the general run of boat cloths in resin adhesion.

Again, however, since Kevlar holds together better, anecdotal reports of delamination may not be due to poor resin bonding, but to Kevlar's resistance to tearing. Hit a glass boat the same way, and the matrix may split or crush rather than delaminate.

Just ask me, I'll make up something good.

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