DETERMINATION OF DENSITY OF MDF
Medium density fiberboard-Determination of density
1 Subject Content and Scope of Application
This standard specifies the method for determining the density of CHINA MDF.
This standard is suitable for indoor medium density fiberboard.
2 Reference Criteria
Preparation of CHINESE MDF specimens in GB 11718.3
Determine the ratio of mass to volume of each specimen.
4 measuring instruments
According to GB 11718.3.
5 Sampling and specimens
Sampling and cutting of specimens are carried out according to GB 11718.3.
6 test methods
6.1 Weighing each specimen, accurate to 0.1g.
6.2 Measure the size of each specimen according to GB 11718.3.
6.2.1 Four thickness measuring points and the positions of length and width measuring points are shown in the figure.
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The thickness of 6.2.2 specimens is the arithmetic average of four-point thickness, and the length and width are the arithmetic average of two measurements.
The volume of 6.3 specimens should be calculated accurately to 0.1 cm.
7 test results
7.1 The density p (g/cm3) of each specimen is calculated according to the following formula, and it is accurate to 0.01g/cm3.
In formula: m – specimen quality, g;
V – specimen volume, cm3.
7.2 The density of a plate is the arithmetic average of the density of all the specimens on the same plate, which is accurate to 0.01g/cm3.