This article elaborates on the calibration method of reference material calibration used by current equal-pressure method gas permeability testing, analyzes practical application situations of reference material calibration. At the same time, this article recommends another calibration method: standard gas calibration. It is pointed out that both reference material calibration and standard gas calibration should be adopted in equal-pressure method gas permeability testing, which can not only pave the way for popularizing equal-pressure method, but also reduce the use-cost.

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