GB/T 17617 - 2018 stipulates the rules for sampling and inspection of refractory raw materials. It specifies the scope of application of sampling, covering all kinds of refractory raw materials. Detailed description of the sampling plan, including sampling method, sample size determination method, to ensure that the sampled samples can represent the whole batch of raw materials. The inspection items and judgment criteria are also clearly defined, involving key indicators such as chemical composition and physical performance of raw materials. The rules provide the basis for mass control of refractory raw materials, and help manufacturers and purchasers to ensure the quality of refractory raw materials through standardized sampling inspection and meet the strict requirements of high temperature industrial production on raw materials.