Polyurethane foam flame retardant standards - polyurethane, foam, fire retardant - Plastic industry

HC WIRE: Large number of rigid polyurethane foam applications are flame retardant, 20-year fire-retardant materials in China corresponding standards have been amended, and gradually with the international standards. Through a summary of previous research, this paper Polyurethane Foam in the implementation of "Classification flammability of building materials" (GB8624-2006) after what direction should be put forward some suggestions.



[Keywords]: flame-retardant standards; polyurethane foam; flame direction

1 polyurethane foam flame more than 20 years the implementation of relevant standards

1.1 "Classification flammability of building materials" (GB8624-1997) for the PU foam level of the stringent requirements of B1



The past 20 years, China's polyurethane industry developed rapidly. As the product has very low thermal conductivity and vapor permeability resistance, light weight, high specific strength, combined with paper, metal, wood, cement board, brick wall Plastic , Asphalt felt so strongly adhesive, without adding Other Adhesives, etc, have many industrial and civil sectors used. However, polyurethane and other polymer materials as a strong polymer flammability. Rigid polyurethane foam of density, thermal insulation performance, the exposed surface with the outside world than other materials, large, therefore easier to burn. With the extensive use of polyurethane foam, the materials, flame, fire, etc. It is an urgent need to address the important issue. In China, accidentally ignited polyurethane foam as a result of the frequent occurrence of fire, to the application of polyurethane foam has had some negative impact. Many experts in foreign countries even think that this issue is whether the future of rigid polyurethane foams



Continue to develop one of the keys. Therefore, the flame of rigid polyurethane foam, security has become an important technology for building materials can index. Building legislative bodies in many countries have formulated a series of flame retardant regulations, at the same time the corresponding development of a series of polyurethane foam combustion testing methods.



China since 1980 has developed four Test method for flammability of plastic national standards, that the oxygen index method (GB2406-1980), hot rod method (GB2407-1980), the level of combustion method (GB2408-1980), Vertical combustion method (GB2409-1980), in particular, the oxygen index method (GB2406-1980) is applied to our rigid polyurethane foam flammability test first a national standard. 1984 Shanghai Public Security Bureau issued "on the production, sale and use of polymer materials management rule", which clearly states: rigid polyurethane foams used in construction, the oxygen index of not less than 26%. Quite a number of provinces and cities fire departments and public security institutions to refer to this requirement has promulgated various local and departmental regulations. Oxygen index greater than 26% of the development of rigid polyurethane foam, also attracted widespread national attention to relevant research. State Science and Technology in the "Plan", "Plan" rigid polyurethane foam during the oxygen index greater than 26% of the target as a national research topic, and in the "Plan" research success. This is the safe use of rigid polyurethane foam, reduction and elimination of fire, played a positive role. But with China's rising science and technology, production and use of rigid polyurethane foam of the relevant public security fire department units and personnel come to realize that their is an organic polymer materials, even if the oxygen index of 26% or higher, does not mean the fire is not burning. High oxygen index can improve Flame Retardant Content to achieve, but a large number of flame retardants have caused the smoke big, toxic disadvantages. Along with polyurethane foam industry, calls for a comprehensive understanding of the combustion characteristics of foam, fire-retardant properties to determine scientifically the comprehensive evaluation index, truly reflect the actual fire in the burning behavior of materials has been on the agenda. Initially self-extinguishing and oxygen index for evaluating the difficulty of the target material burning has been far from sufficient, we must also take into account the fire, the flame propagation rate of diffusion index, size and toxicity of smoke.



This country adopted national standards?? Buildings insulation rigid polyurethane foam (GB10800-1989), and in 1990 the level of implementation of the provisions of combustion and combustion method for the determination of vertical flame-retardant polyurethane foam nature, that is used to measure the flame propagation of flame retardant materials.





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