PVC wire coating

Three room dimensions and two ceiling materials were analysed the products were PVC conduit (rigid and ENMT, semi-rigid 100 m of either) and PVC wire coating (400 m). 

Calculations were made, for many fire scenarios, in which the fire hazard model F.A.S.T. was used to simulate hazard to occupants of a standard room following a fire starting in a plenum above it. A total of 400 m of PVC wire coating was assumed to be present in the plenum. Its decomposition was made a function of the plenum... 

Investigate the fire hazard in a room due to the burning of PVC wire coating in a plenum space above it, when the fire starts in the plenum. 

The product used for these calculations was a fire retarded plasticized PVC wire coating material, which does not spread flame or continue burning unless an external source of heat or flame is directed at it. This material was chosen because PVC represents the most common cable... 

The use of fire safe PVC wire coating products in a plenum, did not contribute, in virtually any of the simulations reported here, to a significant increase in the fire hazard due to the fire itself. This conclusion is valid both for the cases where the fire starts in the room and for the cases where the fire starts in the plenum. 

Especially useful as a plasticizer in applications requiring good elongation retention such as high-tenaperature PVC wire coatings. Its excellent resistance to soapy water extraction also makes it attractive for use in vinyl film and vinyl coated fabrics. TOTM is often a good substitute for polyester polymeric plasticizers in low volatility applications where improvements in processing are desired. 

Kaolin is primarily used in the rubber industry as a filler and is frequently used in the calcined form. It is being widely used in innerliner compound in the tubeless tire industry. Use of kaolin in glass fiber reinforced thermosets improves surface quality, reduces warpage, and lowers crack formation. Kaolin is used in polyvinyl chloride (PVC) wire coating because of its good electrical insulating properties. Surface-treated calcined kaolines are used for tire wheel cap made from polyamides (PA) and greenhouse films from LDPE [7[. 

The average rate of mass loss is calculated from the amount of mass lost and the corresponding time period. The calculations in Table I at 573 K represent the average mass loss of isothermal dehydrochlorination. Thus, the values in Table I (3.4 %/min for blue conduit, 2.9 %/min for grey conduit and 2.3 %/min for wire coating) represent a reasonable estimate of the mass loss rate of the PVC products in a fire, at a temperature not exceeding 563 K. 

Fires starting in a room may eventually get transferred to a plenum above it. However, by the time the effects of such a fire cause PVC products (rigid conduit, ENMT conduit and wire coating) in the plenum to burn, the room has already reached flashover conditions. Furthermore, the smoke generated by the room fire fuel causes much faster toxic concern than that from the PVC products in the plenum. 

Vinyl chloride (CH2=CHC1) is the second-largest-volume chemical made from ethylene. It is made by adding chlorine to ethylene and then thermally cracking out HC1 from the intermediate, ethylene dichloride. The vinyl chloride is polymerized to polyvinyl chloride (PVC), also called vinyl, which is used to make pipe, floor covering, wire coating, house siding, imitation leather, and many other products. 

Poly(vinyl chloride), also known as PVC, is prepared by radical polymerization to produce material composed of an average of 10,000 to 24,000 monomer units. It is atactic and therefore amorphous, but it has a relatively high Tg because of the large size of its molecules and its polar carbon-chlorine bonds. It is a rigid material and is used to make pipe, panels, and molded objects. About 68% of PVC is used in the building and construction industry. A more flexible form of PVC is produced by adding a plasticizer such as dioctyl phthalate. This is used to prepare electric wire coatings, film, and simulated leather or vinyl. ... 

Irradiation crosslinking of PVC-U, carried out using electron beam, has shown a marked increase in glass transition temperature in the presence of a triacrylate, with minimal thermal degradation (216). Electron beam irradiation has also been investigated on a PVC-P wire coating formulation in the presence of different reactive monomers (185). Flame retardancy has also been improved with the incorporation of appropriate flame retardants (118). The effect of UV irradiation on formulations, incorporating iron chloride or cobalt chloride, has also been studied (67). 

The effect of irradiation dose and different polyfunctional monomers(PFMs) at a constant ratio of 10 phr on the physicochemical properties of a PVC formulation used as wire coating was investigated. The PFMs used were trimethylolpropane triacrylate, trimethylolpropane trimethacrylate, ethylene glycol dimethacrylate, diethylene glycol diacrylate, pentaerythritol tetraacrylate, triallyl cyanurate and 1,6-hexanediol diacrylate. The properties studied included tensile properties at room and elevated temps., softening temp., swelling characteristics and volume resistivity. 18 refs. 

It was determined that the shear rate in PVC passing through a copper wire coating die was in excess of 4000000 Is. This resulted in volatilisation of the dioctyl phthalate plasticiser and changes in the polymer molecular structure, as determined by infrared spectroscopy. The flow was studied using capillary rheometry with a die of a 0.15 mm diameter. It was concluded that the change in... 

Orlando, FI., 7th-llth May, 2000, paper 388 EFFECTS OF MAGNESIUM HYDROXIDES ON THE PHYSICAL PROPERTIES OF A SEMIRIGID PVC USED IN WIRE COATING Torone J A Petrie S... 

Primarily used as a plasticizer for PVC and its copolymers. Vinyls plasticized with this ester find application in variety of markets including automotive and furniture upholstery, wire coatings and gasketing materials. 

Vinyl chloride is a colorless gas with a mild, sweet odor. It is a manufactured substance that is used to make polyvinyl chloride (PVC) for a variety of plastic products, including pipes, wire coatings, and upholstery. Burning these products will release dangerous amounts of Vinyl Chloride. 

Lead Compounds—These were among the earliest stabilizers. Although quite effective as heat stabilizers, they are toxic, impart opacity to PVC compounds, and cause black coloration with time because of poor sulfide stain resistance. The primary use for lead compounds is in electric applications such as wire coatings. The principal lead compounds for this use are tribasic lead sulfate, basic lead sulfate silicate, basic lead carbonate, and basic lead phthalate. Use levels usually range from 3 to 8 parts-per-hundred parts of PVC (phr). 

Beilstein Handbook Reference) AI3-17104 BRN 2302822 CCRIS 7052 Di-(2-ethylhexyl) terephthalate EINECS 229-176-9 HSDB 6150 Kodaflex DOTP Terephthalic acid, bis(2-ethylhexyl) ester. Plasticizer used with PVC resins, in PVC plastisols, rubber application including wire coatings, ajtomotive and furniture upholstery compatible with acrylics, CAB, cellulose nitrate, polyvinyl butyral, styrene, oxidizing alkyds, nitrile rubber. Solid mp = 30-34° bp = 400 d = 0.980. Eastman Chem. Co. 

The first commercial blend of this type is Cylon . Here PVC is the matrix, and PA (that melts below 215°C ) the dispersed phase. The two resins were compatibilized using the well known PVC plasticizer — Elvaloy (a terpolymer of ethylene, carbon monoxide and acrylics). These soft to semi-rigid alloys were commercialized for wire coating, automotive applications and blow molding [Grande, 1997 Hofmann, 1998]. They are flame, abrasion and chemicals resistant, easy to process, and tough. 

PVC/NBR blends have been developed in the 1940 s as an alternative to natural rubber. In addition, the blend provided improved processability and high resistance to oxidation, a notorious drawback for the natural rubber wire coatings. 

PVC pipe Vinyl siding Wire coatings Synthetic leather Packaging Furniture... 

PVC is one of the most commonly used amorphous thermoplastics. It is available in two forms plasticised, used mainly in the wire coatings, floor tiles, toy balls, gloves, car seats, rain-wear and in vinyl gramophone-records, and unplasticised, used in pipes, gutters, window frames and wall claddings. 

Chem. Descrip. Polyvinyl chloride homopolymer Uses PVC for calendering, extrusion, molding, elec, wire coatings, flexible and rigid compounding Features Consistent quality good plasticizer dry up Properties Wh. free-flowing powd. sp. gr. 1.40 bulk dens. 0.56 g/cm relative vise. 2.37 (1 % in cyclohexanone)... 

Chem. Descrip. Modified complex lead sulfophthalate salt Uses Heat stabilizer for PVC wire and cable (105°), high temp, wire and cable coatings, flexible and rigid profiles, CPE, CPVC, plastisols Features Economical... 

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