Should Trueview AR sheets be square?

[lawrieh]

I am cutting a 905mm x905mm square from a 915mmx1220mm sheet of Trueview UV70 anti-reflective glass.

Been having problems with the gas fitting, presumed it was me.

I checked my square, its spot on. checked the glass but its not square. On the short side its around 5mm out on the end that is opposite the T-square if that makes sense.

It makes it nigh on possible to cut down to 905mm.... any ideas?

[lawrieh]

The other sheet in the box was not square, (I checked the diagonals), only 115.5cm long and had a scratch. I will send it back.

The next box I've just opened is full length and square. Perhaps just a couple of bad sheets in the previous one.

[Justintime]

Never come across it, but I guess it wouldn't be apparent that often, until you come to do what you're doing...

[pramsay13]

Yes they should be square and I'm sure they are almost always square but I guess there might be a rogue sheet or two that moves slightly when it is being cut in the factory.

[Not your average framer]

I have always been taught never to assume that anything is necesarily supllied cut square and that particularly seems to apply with board materials. Glass seems to be cut square more often, but certainly not always!