Fiberglass: 6oz+4oz vs. 5+5 ?

[MIK911]

So what are the pro's/cons of getting 6+4 vs 5+5 on the deck?
Is it true that since the 'pores' on the 6oz glass are bigger, it'll hold more resin, therefore heavier?
If this is true, can one achieve the same strength (total 10oz of 'glass) by using 5+5oz? (therefore lighter?)

thanks

[Johnny]

All I know is that I like boards glassed with S-glass.

I've heard that it's more expensive and harder to work with, but the end result is very strong and last a long time.

I'm sure the experts will chime in...

[K-man]

I believe that is correct about 6oz holding more resin.As far as weight is concerned,can't see how it would add that much more weight.Another # doesn't seem relative[to me] in a short wide KB.
And as far as glass cloth strength?My understanding is that strength relates to ''tensile'' strength.So what's the advantage of using a more expensive cloth.

[tomway]

I remember when I first started dabbling in shaping and glassing my own boards a shaper from Newquay in England (Chris Jones for those familiar) mentioned that sanding through glass exponentially weakened it. Even just skimming through the sanding coat and taking out the tops of the threads (which he reckoned isn't enough to be visible and often happens even in professional glass shops) would weaken it by 1/2.

The argument therefore was to have a light glass outside so the heavier glass under would maintain the core of strength irrespective of sanding damage. If this argument bears weight (sure there are many who know better than I), then the 6/4 would be stronger, so that's one argument in its favour. Not sure about the weight though, never used two layers of 5oz before.

[surfhorn]

Actually, its the weave of the cloth and not pores.

[Beeline2.0]

..

[WillP]

I get most of my longboards from Steve Boehne at Infinity and he always glasses my bigger (10'+) boards with 5oz. cloth. It definitely keeps the weight down on big boards. Not sure if it would make any noticeable difference on a kneeboard.

Who's shaping your custom? I can recommend a few local southbay guys that'll make a good kneeboard.


PM me.

[K-man]

Found this.

http://www.tapplastics.com/uploads/pdf/ ... 20cloth%22

Answered my own question

[Bill E.]

S-Glass has a much higher tensile strength, but also a much higher cost.

All glass is good in tension, but poor in compression.

In snowboard manufacture the bottom glass is very thin (tension).

The top glass is more than twice as thick to compesate for it being in compression and for the two to equal-out to give the sandwich construction its strength in flex.

Also, most have fibers orientated at 0/90 and at 45 degrees to give it torsion stiffness.

[MIK911]

Dean Cleary gave me this option, and recommended the 5+5 (which i accepted) on my 5'10" swallow tail.

I'm not currently in the market for another board, but was interested in other's experience/opinion on the topic. Would like to keep this option availble for future reference (since there 'will' be other boards).

thanks

[surfhorn]

I've also used 'glass with stripes of graphic in the weave for knee patches.