plywood 'SG' and 'PS' designations

[mark mcfarlane]

What's the meaning of 1SG and 2SG in the below specs?

from http://hwp.us/plywood/plywood.html

3/4 BIRCH C2 UV FINISHED 1SG IMPORT
3/4 BIRCH C2 UV FINISHED 2SG IMPORT

1/8 RED OAK A4 1SG
1/4 RED OAK A4 1SG (INDO.)
1/4 RED OAK A2 2SG

1 or 2 sides grooved ?


How about the PS designation in these specs? i've seen PS used for structural grading, but always with number like PS-1, PS-2,...


1/4 WHITE OAK A4 PS 1SG IMP.
1/8 WHITE OAK A4 PS 1SG
3/4 WHITE OAK A2 VC RIFT CUT
3/4 WHITE OAK B1 P/S VC (DOMESTIC)

[Thomas S Stockton]

ps - plain sliced

1sg one side good

2sg 2 sides good
another one you might find is wpf whole piece face
Tom

[Tony Joyce]

WPF -whole piece face
RC - Rotary Cut

[mark mcfarlane]

Thanks Thomas and Tony.

I might have figured it out, but saying A4 and 1SG in the same spec was redundant.

1/8 RED OAK A4 1SG
1/4 RED OAK A2 2SG

So I guess a WPF would typically be radial cut for a sheet of plywood, unless you had a really big tree.

A good reference for the record, on this page and on the links on this page:

http://www.columbiaforestproducts.co...-and-matching/