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    Home > Coatings News > Paints and Coatings Market > Coating standard: revision of general technical conditions for facing fire retardant coating

    Coating standard: revision of general technical conditions for facing fire retardant coating

    • Last Update: 2020-04-03
    • Source: Internet
    • Author: User
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    Core tips: 1 Classification of fire performance of facing fire retardant coating 2 cancel GB 15442 According to GB 15442 "classification of fire performance of facing fire retardant coating" issued in 1995, the fire performance of facing fire retardant coating is divided into grade I and grade II In the past ten years, the standard has played an important role in guiding the development of facing fire retardant coatings and ensuring the safety of people's lives and properties After more than 20 years of development, the quality of facing fire retardant coating products has been significantly improved At present, there are nearly 150 enterprises producing decorative fire retardant coating in China, 70% of them Paint knowledge how about Akzo Nobel Powder Coating Recommended introduction: powder coating is a kind of coating with different form from general coating, which is in powder form It is a new type of coating, because of its own advantages and more and more known by people Let's introduce Akzo Nobel Powder coating Akzo Nobel Powder coating is a cost-effective coating solution, which can be applied to different kinds of products After the treatment of static electricity and fire baking, a tough and durable coating surface will be formed, with the least impact on the environment Since the introduction of this technology, powder coating has been able to continue to maintain the Home of coatings: 1 "classification of fire performance of facing fire retardant coatings" 2 The "classification of fire performance of facing fire retardant coatings" issued in 1995 was cancelled, and the fire performance of facing fire retardant coatings was divided into grade I and grade II In the past ten years, the standard has played an important role in guiding the development of facing fire retardant coatings and ensuring the safety of people's lives and properties After more than 20 years of development, the quality of facing fire retardant coating products has been significantly improved At present, there are nearly 150 enterprises producing facing fire retardant coatings in China, 70% of which have reached the first level of gb15442.1 At the same time, with the rapid development of China's economy, various materials (including combustible materials) are widely used, so the technical requirements for facing fire retardant coatings are increasingly high Therefore, based on the current situation of the product quality of facing fire retardant coating and the needs of international trade, through a large number of verification tests, the author proposes to cancel gb15442, "fire performance classification of facing fire retardant coating", and stipulate the fire performance technical indicators of facing fire retardant coating products: Fire resistance time ≥ 15 min; flame relay ratio ≤ 25; weight loss ≤ 5.0g; carbonization volume ≤ 25cm3 See Table 1 for the fire performance of facing fire retardant coating products produced by different manufacturers The physical and chemical properties of the decorative fire retardant coatings produced by the 24 enterprises all meet the requirements of the original standards, and 17 of them meet the requirements of the above indexes, accounting for 70% of the total 3 Add the defect classification of technical indicators to make the standards effectively implemented, and it is also conducive to the supervision and management of the supervision department on the products In recent years, the product standards, whether national standards or industry standards, mostly stipulate the defect categories of the technical indicators of the standards, and stipulate the principle of product quality qualification in the inspection rules Therefore, the defect categories of each technical index can be specified according to the influence degree of each technical index on product quality (see Table 2) 4 In the chapter of inspection rules and inspection rules, in order to make the judgment principle more reasonable than the original standard, it is suggested to add the comprehensive judgment principle of product quality: a = 0, B ≤ 1, B + C ≤ 2 (A: heavy defect, B: general defect, C: light defect) The quality of the product can be determined to be qualified only when the product conforms to the comprehensive judgment principle 5 Determination of fire resistance time of facing fire retardant coatings -- Part revision of large plate method GB / T 15442.2-1995 fire performance classification and test method of facing fire retardant coatings -- large plate combustion method has been implemented for nearly ten years since it was published in 1995 In the past ten years, the standard has played an important role in the quality supervision of the fireproof performance of the decorative fireproof coating in China and in improving the quality of such products The method specified in GB / T 15442.2-1995 is to measure the protection time (i.e fire resistance time) of the facing fire retardant coating on the combustible substrate The temperature of the back fire surface of the test piece is located in the center of the back fire surface of the test piece, and the temperature at this point is taken as the criterion of the flame resistance time However, during the implementation of the standard, we found that after the fire expansion and foaming of the facing fire retardant coating, the cracking of the foaming layer appeared in the later stage of the test of some products, which resulted in the temperature of the back fire surface at the crack of the foam layer much higher than the temperature at the center of the back fire surface of the test piece Therefore, it is difficult to objectively reflect the protective effect of the coating on the combustible substrate only by measuring the temperature at a point in the center of the back fire surface In order to ensure the accuracy and reliability of the test data, after a large number of verification tests, the author suggests to add four more temperature measuring points on the back fire surface of the test piece, which are distributed on the diagonal line 100 mm away from the intersection of the diagonal line See Table 3 for test data According to the data statistics in Table 3, it is not difficult to see that 37% of the center temperature of the test piece has not reached 220 ℃, while the other four points have reached 220 ℃ Therefore, it is suggested that five temperature measuring points should be specified on the back fire surface of the test piece, which is more scientific and reasonable than that of the original standard only in the center Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,
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