VVGzng – power cable with copper conductors and insulation made of PVC. The shell of the cable is made of PVC with low flammability zapolneniem.Konstruktsiya Underlying Copper cable is conductive solid or stranded live round or sector shape. Once upon a consistent 1 or Class 2 Standard 22483. Conductor insulation is made of polyvinyl chloride (PVC) plastic. As a rule, multi-strand cables, each isolated vein has a different color or a number, which is placed by printing or stamping (digit height 4 mm, the distance between the numbers – up to 35 mm). Zero veins usually have a light blue or blue insulation, and grounding wires – yellow-green. In multi-strand cable is twisted cores. Filling and cover – of PVC reduced goryuchesti.Tehnicheskie and operating characteristics of the power cable VVGzng can be operated at a temperature of -50 C to +50 C and humidity up to 98% at +35 C.

Long-term allowable temperature of the heating cables in the living the process of costavlyaet +70 C. Short circuit duration up to 4 with the maximum permissible temperature of living should not exceed +160 C. In emergency mode allowed heating cables must be lived no more than +80 C. The duration of the cables must be at least 8 hours a day, but not more than 1,000 hours of life. Lay cable VVGzng recommended at temperatures below -15 C (without preheating).

At The minimum bending radius should not exceed 7.5 of its outer diameter. Rated frequency cable VVGzng is 50 Hz. Swarmed by offers, scholarship program is currently assessing future choices. Test ac voltage at 50 Hz voltage 0.66 kV – 3 kV to 1 kV – 3.5 kV. Guarantee period – 5 years from the date of commissioning. The service life of up to 30 VVGzng let.Sfera VVGzng of cables used for power transmission and distribution in fixed installations in rated voltage of 660 V and 1000 V at 50 Hz. As a rule, they are laid in dry and wet production areas, on cable racks, and in subway systems in nuclear power plants outside of containment. Also, cables VVGzng used for electrical power, requiring the sealing of cables in the electrical input.

Sandwich – paneli.Klei and materials for their development sendvichey.Tendentsii competition in the manufacture of sandwich panels is growing. Companies moving towards cheaper cost. Economy puts their priorities in the selection of raw materials for sandwich panels. Interesting changes await us in the market of external walling, the sandwich panels is based on mineral wool, expanded polystyrene and polyurethane foam. The market value of mineral wool slabs are about 1.5 times higher than that of the foam. In this Minplita sold about twice as expensive as its cost. Not far off the fall in prices for Minplita, and then Minplita cost and foam on the market will be equal. Price foam will not fall, because the profit on its production and so is minimal.

Non-combustible mineral wool to press very soon, much foam on the market sandwich panels. Polyurethane sandwich panels are currently the best in terms of teplosberezheniya and mechanical characteristics. The problem is their low fire resistance. However, replacing polyurethane foam is a foam tsianauratnaya, which practically does not burn. For more specific information, check out Roubini Global Economics. By the year 2010 will come into effect restrictions on the use of combustible materials in construction, and to press strongly tsianauratnaya foam polyurethane.

Existing lines producing polyurethane sandwich will have to change the site of injection and mixing ingredients. New pre-equipped with modern lines of the respective device, working as a polyurethane foam, and the tsianauratnoy such equipment company "Yongming". In the production of sandwiches made of PVC as an "internal" list is almost universally used a cheaper high-impact PS (polystyrene) or ABS. Polystyrene, by the way, stronger than PVC and 0.7 mm thickness for PS is sufficient in case of production to sandwiches window slopes. Excellent high-impact PS is produced by LLC "PolimerMarket", and the most reliable polyurethane adhesive for him – TOP-UR-E-PVC. PVC sheet has long been widely used with a thickness of 0.9 mm, or even 0.8 mm, 1.0 mm and not as it was originally. The best adhesive for sandwich panels remain polyurethane. There is an active search for other cheaper for a base polymer adhesive. But while nothing can come close to polyurethane adhesives for weather resistance and hardiness. One-component polyurethane adhesives costs have long been caught up with two part. A matter of choice of glue – it is a question of equipment used for the production of sandwiches. On continuous lines applies only component polyurethane adhesive. On shotgun assembly lines are applied one-component polyurethane adhesives cure at different rates. Two component adhesive less technologically in the case of bench lines, although some companies have traditionally apply it to this day. Polyurethane adhesive consumption is reduced to 100-120 grams per square meter sandwich panels. More economical use of polyurethane adhesives with low density. Distinguish between low-density glue easily even visually: the glue is transparent, although it may be the color from colorless to red-brown, such as adhesives mark TOP-UR-E-PVC – colorless, and mark TOP-UR-40 yellow-brown adhesive minimum density of 1.1-1.15 g / ml and therefore most economical for consumption. Polyurethane adhesives are high-density: 1.4-1.5 g / ml, is filled with so-called polyurethane adhesives. K-filled polyurethane adhesives include adhesives, most brands and Macroplast Isolemfi. They are opaque, and their color beige or cream. The color is caused by kaolin or chalk, which they introduced to reduce the cost. Filled with polyurethane glues is very heavy, and its relative cheapness, they do not justify – adhesive consumption is quite large, at a cost manufacturer sandwiches even more expensive.