Covering materials for cable materials main points and edge material. Dosage of covering materials for the slightly bigger than the flange material, smoke suppression flame retardant cable materials belong to the covering materials for cable materials in the industry. Because of covering materials for cable are mostly plastic and rubber material, easy to burn such materials. Wire and cable is often due to itself in the process of transmitting electricity heating or due to external flame combustion, thus cause and spread into the fire. Every year in China because of the cable fire losses caused by hundreds of millions of yuan. Therefore, wire and cable fire retardant subject more and more aroused people's concern. And then a flame retardant fire prevention materials research and development. Flame retardant cable is and its associated with the molecular structure of the polymer materials, but more importantly, it adopted by the flame retardant materials. First in order to improve the flame retardant properties of wire and cable, general use PVC material or added in the polyolefin flame retardant containing halogen class. This kind of wire and cable has good flame retardant effect, but in the process of combustion will release a lot of smoke and halolide gases, make the person suffocate, easily did a lot of corrosion of equipment at the same time, the so-called "secondary disaster". A lot of fire analysis shows that the proportion of toxic smoke kill people is much higher than the proportion of high temperature burning to death. During the second world war developed a antimony halogen flame retardant system, and is known as a milestone in the history of the development of flame retardant technology, after more than half a century of research and application has to mature, and in recent 20 years has been in an important role in the field of flame retardants. But it burns caused by toxic fumes choked the people more easily than high temperature calcination make people dead.
Internationally, particularly in the European Union and Japan, the flame retardant cable material earlier put forward the requirement of high performance, non halogenated flame retardant, and has to be standardized in many industries with cable. Since 1986, Germany and other European countries and the United States is much Australia diphenyl ether phosphorus-containing flame retardants such as toxicity and environmental topics, had an argument. Latest promulgated the eu ROHS directive explicitly pointed out that since July 2006 old, electric and electronic equipment in the new market, banning the use of lead, mercury, pan, hexavalent chromium, more P wave diphenyl ether (BDE) and Macao biphenyl (PBB), and other harmful substances. The PBB and PBDE is much marina containing flame retardants for plastics flame retardant. In addition, SONY of Japan's newly launched SONY certification of green environmental protection, which is clearly exaggerated stop using PVC cable materials, halogen-free flame retardant cable materials instead of. It should be said, has a huge impact on our country as these rules are but on people's life safety, environment pollution reduction is beneficial. The technology level of China's wire and cable material has been and abroad. In the early 80 s, many manufacturers in the cable industry in our country has successfully developed a general flame retardant cable. According to statistics, in 1987 a 1991 has developed more than 40 flame retardant cable, basically adopts the flame retardant PVC and neoprene, the flame retardant cable is only suitable for occasions with low requirements, and for some special occasions with higher flame retardant grade, requires the use of low smoke, zero halogen flame retardant cable, such as: underground public facilities, high-rise buildings, ships, warships, etc. With the development of flame retardant cable technology, and familiar with wire and cable fire accident, the domestic various fields using the part of the cable to cable halogen-free flame retardant is becoming more and more high, the first is a few use areas are mainly in the corresponding technical specification or technical requirements in bidding, puts forward new requirements for flame retardant species, in the form of legislation, and by many standards, specifications and engineering bidding requirements for confirmation.
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