Kayak and Canoe Design Bulletin Board

Re: S-glass

Posted By: Tapio Manner
Date: Thursday, 11 May 2000, at 1:37 p.m.

In Response To: S-glass (Rick Lawler)

: I asked this on the kayak building board and haven't gotten a reply, so I'll
: try it here. Does anyone know how much stronger S-fiberglass is than
: standard E-glass? Would 4 ounce S-glass roughly correspond in tensile
: strength to 6 ounce E-glass? And what about Kevlar? It seems that Kevlar
: of a given weight/yard has similar tensile strength to standard E-glass of
: twice as much weight/yard (i.e. 5 oz Kevlar = 10 oz glass)- does this
: sound about right? Thanks.

In a kayak the strength of the material is only on thing and ordinary E-glass is strong enough, so S-glass just is not worth the price. Stiffnes is the other important factor and there both glasses lack property. The only practical alternative IMHO is HS-carbon. Especially stiffnes is difficult in thin laminates (weather wood or man-made composite) because it depends on the third power of thicknes so the effect of the fiber is easily overpowered by this. Twenty years ago carbon fibers were somewhat brittle but the modern HS fibers are very different.

TLM

Messages In This Thread

S-glass
Rick Lawler -- Wednesday, 10 May 2000, at 11:12 p.m.

Re: S-glass
lee -- Thursday, 11 May 2000, at 7:34 a.m.

Re: S-glass
Tapio Manner -- Thursday, 11 May 2000, at 1:37 p.m.

Re: composites
Doug Kuik -- Monday, 15 May 2000, at 5:27 p.m.

Re: S-glass
David Huang -- Tuesday, 20 August 2002, at 5:59 a.m.

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