The volatile matter of coal refers to the gas and liquid (in a vapor state) produced by the decomposition of organic matter in coal after heating the coal sample at 900 ± 10 ℃ in isolation from air for 7 minutes.

The determination of volatile matter is a highly standardized experiment, and the results depend entirely on the specified test conditions. Therefore, when measuring the volatile matter of coal, the technical requirements for the determination are very strict. Specifically, as follows:

Technical requirements: (1) The temperature inside the high-temperature furnace should be strictly controlled within the range of 900 ± 10 ℃. When the sample is placed, the furnace temperature should recover to 900 ± 10 ℃ within 5 minutes.

(2) The timing of heating time should be done using a stopwatch, which starts when the sample is sent into the high-temperature zone of the high-temperature furnace and continues until the sample leaves the furnace. This operation process should be accurate at 7 minutes. Otherwise, the sample will be scrapped.

(3) Special crucibles should be used for measurement. When the crucible is burned in the furnace, direct contact between the crucible and the high-temperature furnace wall should be avoided.

(4) When measuring, if black smoke accumulates on the crucible or crucible cover, the test should also be scrapped.