Muffle furnace refractory castables must be subjected to on-site slump measurement and sample sampling according to regulations. The test and sampling equipment used must meet the requirements and be verified.
1. Inspection of the test block of the mix ratio before construction. Before construction, the refractory castable of the annealing furnace should be made into test blocks according to the mix ratio specified in the design. After inspection, it meets the specified requirements.
2. Detention of test block. Annealing furnace refractory castables should be batched for every 20m3 of each grade or mix ratio of a single project. Retain the test block for inspection. If it is less than this number, a batch of test shall be made; when each single project uses the same brand or mix ratio for multiple constructions, the test block shall be retained for inspection every time.
3. Physical and chemical testing. Annealing furnace refractory castables and other unshaped refractory materials shall be subject to physical and chemical inspection items and the number of samples shall be carried out in accordance with regulations.
4. The maintenance of the sample should meet the regulations.
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