GB/T 22899.2-2008 "Paper and board — Determination of hygroexpansivity — Part 2: Hygroexpansivity up to a maximum relative humidity of 86%" specifies the method for determining the hygroexpansivity of paper and board when the relative humidity is increased to 86%. It applies to various types of paper and board. By gradually raising the ambient relative humidity to 86%, the dimensional changes of the specimen after reaching equilibrium are recorded, and the hygroexpansivity is calculated. The standard clarifies the control accuracy of temperature and humidity, equilibrium time, and measurement procedures, providing a basis for evaluating the performance of paper under high-humidity conditions.
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 |