REFLECTOR:STRUCTURAL ADHESIVE

[Scott Derrick]

All of this sounds OK, sort of.

But in the scientific world which we are trying to emulate its all 
anecdotal, which means it ain't worth the paper its printed on.

Where's the specs?  Where's the testing results.

I know Rutan didn't recommend West but he states specifically that he 
only recommends products that he has tested, and as far as I know he 
never tested West for applicability.  Or maybe he did, but I haven't 
been referred to any documents that support that.

As far as I know Nat never did any testing of resins, he just followed 
Rutan's lead, not a bad lead to follow.

Here is a brief West Systems Properties page

http://www.westsystem.com/webpages/userinfo/moreinfo/properties.htm

I've seen one of these for EZPoxy but can't seem to find it.

Anybody know of one online?

Scott


Alexander Balic wrote:
> The resin provides the shear strength of the laminate - it is like the
> difference between trying to bend a board (strong resin) and a telephone
> book (weak resin) the difference in the telephone book is that there is no
> shear strength between the pages (fibers).  But you only need just enough
> resin to make maximum contact with the fibers, any more, and the fibers will
> tend to float apart, causing more of the (much) weaker resin to be in shear,
> by cross section, as well as making the lay-up unnecessarily heavy. so the
> argument is correct, but to be able to stress a given laminate is
> proportional to the shear strength of the resin, but once the resin starts
> to fail, the laminate is done (de-lamination) so perhaps a stronger resin
> could provide the same stiffness with less fibers, but I would say that the
> only way to significantly change the stiffness is to go to a lower modulus
> of elasticity (low E)  fiber like graphite, that has less stretch than the
> glass.
> 
> -----Original Message-----
> From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
> Behalf Of lawrence epstein
> Sent: Tuesday, May 06, 2003 6:42 AM
> To: reflector@tvbf.org
> Subject: Re: REFLECTOR:STRUCTURAL ADHESIVE
> 
> 
> Is this accurate?  I was under the impression that a very small percentage
> of the ultimate (load bearing) strength is from the resin.  "strength" is
> derived from the fibers .  the resin merely keeps the fibers lined up?
> 
> Larry Epstein
> 173 FGE
> 
> 
>>I'm saying that for a laminate of the same strength or of the same
>>stiffness you'd use fewer plies (and thus have less weight) with ProSet
>>than with WEST.  (Note that they're both made by Gougeon)
>>
> 
> 
> 
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