With the rapid development of仿古 building materials, the inspection of antique tiles has become a matter of public concern. If the products are qualified, customers can use them with peace of mind. However, as things often do not go as planned, there are still many issues with the inspection of ancient-style tiles and bricks, and it can be said that there is no clear inspection standard in the current market. Below, I will briefly introduce the key points to be noted in the quality inspection of ancient-style tiles and bricks.

Firstly, the raw materials for producing ancient architectural bricks and tiles must meet the required standards. Planed extraction of the raw materials is mandatory, with different quality materials stored separately and mixed in proportions according to the requirements of the quality management department. Each shift is supervised by the workshop leader and a workshop-level quality inspector. The company should set up a raw material storage area (including internal fuel) based on the scale of production. The incoming raw materials should be stacked in batches. The types and quality of coal and internal fuel (including calorific value, moisture content, etc.) must comply with the requirements for brick and tile production, and should be mixed according to laboratory test results.

The company should build sheds (fields) for raw and auxiliary materials based on local rainfall, with the storage capacity in the south generally not less than seven days of production usage, and in the north not less than three days of production usage.

Next, strict control over the raw materials of ancient architecture bricks and tiles is essential. Chemical analysis of the raw materials must be conducted prior to production, with inspections typically conducted every six months. In case of changes or replacements in raw materials during production, timely testing is required. The particle size of raw materials used for brick making should not exceed 3mm, while for coal gangue brick making, it should not exceed 2mm. The particle size for making tiles and hollow bricks or blocks should not exceed 2mm. The particle composition of the raw materials should be inspected every six months, and timely inspections should be conducted for any changes in raw materials. The plasticity index for soil used in brick making should be greater than 7. The drying sensitivity coefficient should be less than 1 for low sensitivity, between 1-2 for medium sensitivity, and greater than 2 for high sensitivity; for brick and tile making raw materials, less than 2 is preferable. The natural moisture content of the raw materials should be lower than the molding moisture requirement. The sintering temperature and range should have a sintering temperature range greater than 50℃. Inspections should be conducted upon production or replacement of raw materials. Heat output, when using coal gangue or fly ash as raw materials, should not exceed 4800 kJ/kg, with one inspection per batch of raw materials.

Once again, quality inspections of semi-finished products are crucial. Enterprises should develop technical conditions for semi-finished product quality inspections based on the properties of the raw materials used, referencing the brick and tile product standards for making fired common bricks, porous bricks, hollow bricks, and clay tiles, etc. Key parameters include: allowable dimensional deviations, complete surfaces, chipped edges and corners, crack lengths, protruding impurities, warping, and rib heights. During the firing process, balance must be maintained across the five stages (drying, preheating, firing, holding, and cooling). The firing workers should regularly visually inspect the speed of the fire, preheating, firing zone length, the number of rekindling fire holes, preheating, and firing zone temperatures. Each shift in the workshop should conduct inspections, and the teams should keep records.

Then comes the quality inspection of the finished products. Bricks and tiles must be sampled and inspected by the company's quality control department in accordance with the batch time and specified items as stipulated by the bricks and tiles product standards. A certificate of conformity must be issued before they can be shipped out. The bricks and tiles shipped out must be graded and stacked according to product standards, with strict control over mixed grades. Defective and waste products must not be sold as conforming products. Bricks and tiles enterprises should regularly visit customers, seek their opinions, and improve the quality.