Cable with polymer compound isulation and coating

цена на кабель с ПВХ медный, стоимость, продажа

The appearance of this type of cable has been due to the fact that all the non-combustible fire-resistant cables with PVC sheath (marking -ng) contain halogens. (including such halogen elements as fluorine, chlorine, bromine, iodine and astatine ). Despite the fact that halogen containing cables are an effective method of flame retardance, in the event of a short circuit, those in immediate proximity to the cable are exposed to toxic chemicals such as hydrogen chloride gas and Carbon monoxide. Therefore, the use of steel cables containing halogens are banned in areas with dense populations of people such as subways, stadiums, concert halls, etc.

The solution to this problem was the development of halogen-free cables from polymer compositions. Their main advantages are lack of toxic and smoke generation during combustion and the allocation of the corrosive substances. The The oxygen index (CI) of halogen-free cables are relatively high at range of 35-40 units. This means that for combustion to occur, the air must contain at least 35-40% O2. Under normal conditions the oxygen content of air is approximately 21%. Therefore, substances with a high CI (> 27) are difficult to combust. This type of fireproofing is achieved by introducing aluminum hydroxide (Al(OH)3) and magnesium hydroxide (Mg(OH)2), which are flame retardant. Under the influence of high temperatures, the process of decomposition of metal hydroxides are inflammable gases and water, which dilute the oxygen thereby reducing combustability.

The most popular cable with insulation of polymer materials is ППГнг-HF.

ППГнг-HF – Index HF – It means that the cable does not contain halogens (Halogen Free). Technical characteristics of the cable match the figures in the NPB 248-97 fire safety regulations. This type of cable is widely used for offices and other premises where there is computer equipment and other office equipment as well as in subways, residential buildings, shopping malls, schools, hospitals and other densely populated areas.