[Oberon_1]

Maybe this topic had been discussed before, but I couldn’t find a direct answer.
My question is about the manufacturing standards for plywood. In almost all cases plywood thickness comes rated as a rounded number: 1/4”, 1/2”, 3/4”…But in reality all of them are significantly thinner. For example the 1/4” plywood is 5mm, while the 3/4” is only 18mm thick. That is a significant difference. Therefore the question is why?
And, is there any kind of plywood that is made true to size and if so, who sells it?
Also, there doesn’t seem to be a standard about the number of ply for any thickness. At least it’s never specified in stores and in lumberyards.

 

[Oberon_1]

1) That is no excuse since a lot is manufactured for the US market.
2) But even if they produce by the metric system, they could say it’s 5mm, or 18mm thick. I’m more annoyed by the fact that it’s advertised (and sold) in fractions of inches, when in reality it’s not.
So, when you buy a sheet of plywood you can’t really tell what will you get (in terms of thickness, number of ply, and what the inner layers are made of). The only way is from previous experience.

 

[Oberon_1]

Imperial sizes are no longer a world standard. We're about the only place left using imperial sizes.

I see using the imperial sizes as a convenience. Massive quantities of metric sized ply is imported to the US. I'm not sure if there is any manufacturer in the USA producing ply. And if they hope to sell it overseas, they will have to produce metric.

Not sure it matters much so long as the makers identify it by its metric size. Calling 18mm 3/4 inch is something done in ad copy and price tags. I don't think there's anything to be done about it. I mean, if you want to use plywood, you don't have any alternatives anymore.

Imperial sizes are no longer a world standard. We're about the only place left using imperial sizes.

I see using the imperial sizes as a convenience. Massive quantities of metric sized ply is imported to the US. I'm not sure if there is any manufacturer in the USA producing ply. And if they hope to sell it overseas, they will have to produce metric.

Not sure it matters much so long as the makers identify it by its metric size. Calling 18mm 3/4 inch is something done in ad copy and price tags. I don't think there's anything to be done about it. I mean, if you want to use plywood, you don't have any alternatives anymore.

You’re right. Anyway, I read somewhere that plywood made to the full size of 1/4”, 1/2”, etc can be purchased. Do you know about such products?