Subject: Re:: Re: [harryproa] Equivalency numbers
From: "realink@iprimus.com.au [harryproa]"
Date: 7/3/2018, 11:50 PM
To: <harryproa@yahoogroups.com.au>
Reply-to:
harryproa@yahoogroups.com.au

 


Ply vs foam/glass at the extremes is not about strength or stiffness.  3mm foam with 100 gsm glass each side would be about the same stiffness as 3mm ply, but would have no impact resistance.  25mm ply has similar stiffness to 25mm core with 1,5000 gsm each side, but is far heavier. 

I think what ply has, that even Woods wasnt able to comprehend

Ply has utility, if you can take it off the rack, or buy it somewhere locally and deliver it yourself
you didnt have to make it, it was just there, it has an immediacy of purpose that for an average use exceeded the requirement. Mark it out, cut it up, install, resin, peel ply, ... bang job done.

Not to say you couldnt have foam core sheets in the same way, but we dont ...



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Posted by: realink@iprimus.com.au
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