GB/T 3000-1999 in English

本标准规定了测定致密定形耐火制品透气度的方法。对定形隔热耐火制品透气度的测定，可参照本标准。本标准所规定的方法考虑到气体的动力粘度。因此，所得的结果不可直接与早期没考虑粘度的方法所得的结果比较。测定时一般通空气，需要时可用其他气体，已给出空气和氮气的粘度。

Scope

This standard specifies the method for determining the air permeability of dense shaped refractory products. For the determination of air permeability of shaped heat insulation refractory products, you can refer to this standard. The method specified in this standard takes into account the kinetic viscosity of the gas. Therefore, the results obtained are not directly comparable to those obtained by earlier methods that did not take viscosity into account. Air is generally used for measurement, and other gases can be used if necessary. The viscosities of air and nitrogen have been given.