规定了标准系列高温参考锥的特性，用于在1500至1800 C的温度范围内测定耐火材料的高温锥当量（耐火度）。本国际标准中规定的锥适用于ISO 528中所述的程序，不包括在1500和1800 C下的测定。

Specifies the characteristics of a standard series of pyrometric reference cones, which are used for determining the pyrometric cone equivalent (refractoriness) of refractory materials, over the temperature range 1500 to 1800 C. The cones specified in this International Standard are suitable for use in the procedure described in ISO 528, excluding determinations at 1500 and 1800 C.