本文件规定了测量填充材料透气性和孔隙率的方法 金属粉末层，以及由此导出的包络比表面积值。这个 渗透性是在稳态流动条件下，使用一定压力下的层流空气来确定的 接近大气。本文件不包括通过常数测量渗透率 体积法。交叉引用:ISO 3954ASTM标准C721ASTM标准B330ASTM标准E2980ISO 3252购买本文件时提供的所有现行修订版均包含在购买本文件中。

This document specifies a method of measuring the air permeability and the porosity of a packed bed of metal powder, and of deriving therefrom the value of the envelope-specific surface area. The permeability is determined under steady-state flow conditions, using a laminar flow of air at a pressure near atmospheric. This document does not include the measurement of permeability by a constant volume method.Cross References:ISO 3954ASTM Standard C721ASTM Standard B330ASTM Standard E2980ISO 3252All current amendments available at time of purchase are included with the purchase of this document.