5' x 5' vs 4' x 8' plywood sheets

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Forum topic by SteveMI posted 08-12-2015 08:04 PM 941 views 0 times favorited 1 reply Add to Favorites Watch
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1094 posts in 3295 days

08-12-2015 08:04 PM

I have found that the glues used for the two sizes of plywood are different. Seems 5’ x 5’ is glued with Urea Formaldehyde Adhesive, and 4’ x 8’ is glued with Phenol Formaldehyde Resin. Both glues are industrial.

I learned the glue information through a bad experience with 4’ x 8’ sheet material not getting repeatable cutting with a laser. Even with higher power there would be sections that did not cut. Switching to 5’ x 5’ sheets with recommendation by the laser machine rep solved the issue, lesser power and repeatable full cutting.

And I had a better experience on the CNC with the left over 5’ x 5’ format sheets. Bits seemed to be cleaner after cutting and I could cut at a slightly faster rate.

So, for the cabinet shop and furniture guys that use a CNC, does this make sense? Is my limited sample size on the CNC too small?

And to go on tangent, is either a better substrate for veneer?


1 reply so far

View greg48's profile


601 posts in 2758 days

#1 posted 08-12-2015 09:16 PM

Steve, I’m only aware of the Baltic birch ply being offered in the 5×5 format, while the 4×8 formats are offered for construction and cabinet grade plays. The glue types may be a factor, but the fact that there are no voids in the Baltic birch may be more significant. That will be $0.02 please.

-- Greg, No. Cal. - "Gaudete in Domino Semper"

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