Review
The national standard for ceramic wall tiles specifies the definition, technical requirements, test methods, inspection rules and signs, product instructions, packaging, transportation, storage and ordering of dry pressed ceramic tiles. Porcelain bricks are g/t4100â€2006 appendix g (water absorption rate e≤0.5%); ceramic bricks are gb/t4100â€2006 appendix l (water absorption rate e>10%).
Inspection standards
ISO 9001: ISO 9001 is used to verify that the organization has the ability to meet customer requirements and apply
The ability of products required by regulations to enhance customer satisfaction. With the continuous expansion of the commodity economy and increasing internationalization, in order to improve the credibility of products, reduce duplication of inspections, weaken and eliminate technical barriers to trade, and safeguard the rights of producers, distributors, users and consumers, this third certification party does not It is governed by the economic interests of both the producer and the seller. Notarization and science are the passes for the quality evaluation and supervision of products and enterprises; as the basis for the customer's review of the supplier's quality system; the enterprise has the ability to meet the technical requirements of its ordered products.
All certified companies have reached international standards in the integration of various management systems, indicating that the company can provide customers with expected and satisfactory qualified products continuously and steadily. From the perspective of consumers, the company is customer-centric, able to meet customer needs, achieve customer satisfaction, and not induce consumers.
3c certification (China National Compulsory Product Certification): It is a product conformity assessment system implemented by governments in order to protect consumers' personal safety and national security, strengthen product quality management, and implement laws and regulations. The so-called 3C certification is China's compulsory product certification system, the English name China Compulsory Certification, the English abbreviation CCC.
Size deviation
Tile dimensions include side length (length, width), edge straightness, straight angle, and surface flatness. Dimensional deviation refers to the allowable deviation of the average of these dimensions from the working size.
1. The side length is an indicator of the length and width dimensions of the tile.
2. The straightness is reflected in the plane of the brick, and the deviation of the center of the side from the straight line.
3. Straight angle refers to the vertical degree of the four corners of the tile (put one corner of the brick against the right angle corrected by the standard plate and measure its deviation from the standard right angle).
4. Edge Bend—The center of one edge of the brick is a distance from the two corners of the edge.
5. Surface flatness is measured by three points on the tile surface.
a. Center Bend—The center of the brick deviates from the plane defined by the three corners of the four corners of the brick.
b. Warpage—The three corners of the brick determine the distance of the fourth corner from the plane.
Surface Quality
Excellent product: At least 95% of the bricks are 0.8 mm away from the vertical observation surface without defects.
Qualified products: At least 95% of the bricks are perpendicular to the surface at a distance of one meter.
Spots and stains that appear for decorative purposes are not considered defects.
(Defects generally refer to: black spots, pinholes, yin and yang, lack of flowers, sag, chipping, etc.; glazed tiles, dirty, pinholes, puddles, etc.)
Physical properties
1. Water absorption rate: It refers to the percentage of the weight of the inhaled water as a percentage of the weight of the product after the open pores of the ceramic product are filled with water. The national standard stipulates that the water absorption rate ≤0.5% is called porcelain brick, (the average value is not more than 0.5%, the single value is not more than 0.6%), and the water absorption rate is >10% for the ceramic brick (the average water absorption rate of the ceramic brick) For e>10%, the single value is not less than 9%, when the average e>20%, the manufacturer should explain).
2. Strength:
a. Porcelain brick: thickness ≥ 7.5mm, the average breaking strength is not less than 1300n.
Ceramic brick: thickness ≥ 7.5mm, the average breaking strength is not less than 600n.
b. The average modulus of the fracture modulus of the porcelain brick is not less than 35mpa, the single value is not less than 32mpa, the average value of the fracture modulus of the ceramic brick is not less than 15mpa, and the single value is not less than 12mpa.
3. Thermal shock resistance: no cracking or cracking occurred after 10 times of thermal shock resistance test.
4. Anti-glaze cracking: After the glaze cracking test of the glazed ceramic tile, the glazed surface should be free of cracks or peeling.
5. Gloss: The gloss of polished tiles is not less than 55. (Glossiness is one of the reference indicators for measuring the degree of sintering of polished tiles. The higher the gloss, the better the compactness of the sintering).
6. Abrasion resistance: The depth of wear of the unglazed brick is not more than 175mm3.
7. Small color difference: report the color difference of ceramic tiles after inspection. There are two kinds of color difference, one is the color difference on the single product itself, and the other is the color difference between the single piece and the single piece. The probability of occurrence of the former is small, while the latter is more common. In general, slight chromatic aberration is unavoidable, especially for products produced at different times. The color tone is always subject to subtle changes, which are related to changes in raw materials, metering deviations in ratio, temperature at firing, and fluctuations in firing atmosphere. Etc. Even related to climate change. Therefore, the factory has to carry out the "color number" sorting of the kiln products to ensure that the same batch of products have the same or substantially the same color tone.
Physical performance quality indicators are: frost resistance, wear resistance, impact resistance, linear thermal expansion coefficient, wet expansion, floor tile friction coefficient.
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