Environmental Chamber

Conditioned : In moisture equilibrium with a conditioning atmosphere, A sample of a paper or board is conditioned and said to be in equilibrium with the conditioning atmosphere when it has been exposed to the atmosphere long enough for the results of two weighings of a test piece, per formed at an interval of at least 1 h, not to differ by more than 0.25 per cent.

Conditioning atmosphere :
For general purposes the conditioning atmosphere in testing paper and board shall be :

• Temperature - 230 ± 10 C
• Relative humidity - 50 % ± 2%