The wood standard specifies the method for measuring apparent density and is applicable to all kinds of leather that can accurately measure the thickness of the leather.
QB/T 3812.10-1999 history
2005QB/T 2715-2005 Leather-Physical and mechanical tests-Determination of apparent density
QB/T 3812.10-1999 Leather.Determination of apparent density was changed to QB/T 2715-2005 Leather-Physical and mechanical tests-Determination of apparent density.