1, thematic content and suitable scope

This standard provided the means of moisture content of beaverboard of the density in determining.

This standard is applied to indoor beaverboard of the density in using.

2, cite standard

The preparation of test specimen of beaverboard of the density in GB 11718.3

3, principle

Pass metage, affirmatory test specimen is as dry as its when sampling of quality of the constant weight after the quality that reduces to the quality that reduces between constant weight and this and test specimen are dry than.

4, equipment and metrological implement

4.1 balance, feeling quantity is 0.01g.

Sweatbox of 4.2 air convection, temperature can be controlled in 103 ± 2 ℃ .

4.3 desiccator, diametical 250mm.

5, sampling and test specimen

The sampling of test specimen and cut, answer to undertake according to the regulation of GB 11718.3.

6, test method

6.1 test specimen are after sampling instantly metage, come accurately 0.1g. Should notice to avoid moisture content to arrive in sampling during metage produce change.

6.2 test specimen in the thermometer the condition of 2 ℃ of 103 ± falls dry to constant weight, after cooling inside desiccator, should instantly metage, in case change of test specimen moisture content exceeds 0.1% .

7, test result

The water content W of 7.1 test specimen (% ) should press type is calculated, come accurately 0.1% .

W=(m0-m1)/m1 × 100
　
In type: The quality of the test specimen when M sampling, g;

M test specimen is dry the quality to constant weight hind, g.

The 7.2 moisture content of every Zhang Ban, for the arithmetical average of moisture content of 3 test specimen, come accurately 0.1% .

8, add specification:

This standard is put forward by ministry of forestry of People's Republic of China.

This standard puts in a mouth 's charge by institute of industry of lumber of academy of Chinese forestry science.

This standard by Fuzhou man-made board factory is in charge of drafting.

This standard basically drafts person topaz booth, Zhuang Yuanbiao, Liang Zhonghuang, Wang Xu.

(responsibility of Chinese lumber net edits: Xu Xiao)