GB/T 22899.1-2008 "Paper and board—Determination of hygroexpansivity—Part 1: Hygroexpansivity up to a maximum relative humidity of 68%" specifies the method for determining the hygroexpansivity of paper and board when the relative humidity is increased to 68%. It is applicable to all types of paper and board. After conditioning the specimen under standard conditions, it is exposed to an environment with a relative humidity of 68%. The dimensional changes are measured, and the hygroexpansivity is calculated. The standard defines requirements for environmental control, dimensional measurement accuracy, and result calculation, reflecting the hygroscopic expansion characteristics of paper under this humidity condition.
This summary is not the original standard text and is for reference only. For accurate information, please obtain it through official channels.
| Status | Active | ||
|---|---|---|---|
| CCS | Y30 | ICS | 85.010 |
| Release Date | 2008-12-30 00:00:00 | Implementation Date | 2009-09-01 00:00:00 |