Compound sheathing

To make these polymers have the desired properties, certain additives (chemicals), as noted below, are added to the sheathing compound in specific ratios. The additives act like Hame retardants and diminish the igniiability of the insulation by lowering the temperature of the cable, delaying ignition and resisting the spread of fire in the insulation and ihe polymeric compounds... 

Cable sheaths may be covered with paper and hessian wrappings impregnated with bituminous compounds or with extruded or taped plastics outer sheaths. At pinholes or discontinuities in protective coatings the sheath will be particularly liable to electrolytic corrosion in stray-current areas, and it is desirable to supplement this form of protection by drainage bonds or direct cathodic protection. 

Component of the myelin sheath surrounding the axons of nerve cells. Additional compounds of the myelin sheath are phospholipids, cholesterol, cerebrosides, and specific keratins. The myelin sheath constitutes an isolating barrier during electrophysiological axonal signaling. 

In contrast to sugar, solid sodium chloride dissolves in water to give a liquid that conducts electricity. Figure 3-19 shows that a solution of NaCl is a good conductor. When an ionic compound dissolves in water, its component cations and anions are free to move about in the solution. Mixing leads to a uniform distribution of Na and Cl ions through the entire solution, with each ion surrounded by a sheath of water molecules as shown in Figure 3-20. 

At the m.p. of aluminium (600°C) an aluminium-sheathed palladium thermocouple formed an alloy with a flash and an exotherm to 2800°C [1]. The use of thin layers of palladium or platinum on aluminium foil or wire as igniters derives from the intense heat of alloy formation, which is sufficient to melt the intermetallic compounds [2],... 

Gravesend, 2002, pp.2. 30cms. 25/4/2002 CATAPYRRIC SX545 CM540U SILANE CROSSLINKABLE LOW-SMOKE LOW-TOXICITY HALOGEN-FREE FLAME-RETARDANT COMPOUND, FOR INSULATION OF LV CABLES AND SHEATHING OF ALL TYPES OF CABLES AEI Compounds Ltd. 

A former having roughly the shape of the article to be moulded is immersed in a suitable liquid compound that forms a deposit onto the former, which is possibly heated to ease the increase in thickness of the deposit. The former can be first sheathed with a knitted fabric to reinforce the dipped polymer. This process is used in special cases ... 

Organotellurium compounds such as dimethyltellurium dichloride and dimethyltelluride have been reported as potential inhibitors of squalene monooxygenase, causing a dramatic reduction in the rate of cholesterol biosynthesis and leading to degradation of the myelin sheath. 

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