Metal melt index

The various alkali metals may yield slightly different results in terms of catalyst performance. Lithium is slightly preferred over sodium as a melt-index promoter, and both may be preferred over potassium. Such differences have been reported in investigations on silica doped with 5 mol% of alkali metal and calcined at 700 °C. Lithium caused crystallization to form quartz whereas sodium and potassium caused conversion to cristobalite [477,609-612],... 

Figure 1. Effect of stearic add on melt index of metal sulfonate CR-2504 (base polymer—CR-2504 sulfonate content—33 meq/100 polymer)...

Polyethylene (Marlex 5003, Phillips Petroleum Co., Bartlesville, Okla.) was formed from powder into 0.009-inch-thick sheets between specularly smooth Mylar sheets in a metal mold at a temperature of 150°C. and pressure of 1000 p.s.i. for approximately 5 minutes. The polymer has a density of 0.95 and a melt index of 0.3. 

Shark-skin occttrs when the melt index and the coefficient n are small. This may happen when a larger amount of plasticizer is used Die swell is caused by elastic deformation in flow. It resrrlts from material expansion after it leaves the die. Increase in shear rate increases die swell. Parison sagging is caused by a decrease in pseudoplastic properties (coefficient n becoming closer to unity) and decreased friction between metal and melt. 

Testing 271 Melt enthalpy 160 Melt Index 153 Metal deactivators... 

Colorless cubic crystals or white granular powder saline taste odorless hygroscopic does not melt but sublimes on heating at 340°C vapor pressure 48.75 torr at 250°C and 251.2 torr at 300°C density 1.5274 g/cm at 25°C refractive index 1.642 readily dissolves in water, solubihty 229 g and 271 g/L solution at 0°C and 20°C, respectively solubdity lowered by alkah metal chlorides and HCl dissolution lowers the temperature of the solution sparingly soluble in alcohols (6 g/L at 19°C) and soluble in hquid NH3 insoluble in acetone and ether. 

A bright white metal soft and ductile body-centered cubic structure index of refraction 3.03 density 5.96 g/cm melts at 1,910°C vaporizes at 3,407°C electrical resistivity, 18.1 microhm-cm at 0°C and 20.1 microhm-cm at 25°C magnetic susceptibility 1.4x10 cgs units modulus of elasticity 18-19x10 psi shear modulus 6.73xl0 psi Poisson s ratio 0.36 thermal neutron absorption cross section 5 barns/atom insoluble in water, dilute sulfuric acid, and hydrochloric acid at all concentrations soluble in nitric acid, aqua regia, and concentrated sulfuric acid insoluble in alkalies. 

White crystalline powder sharp metallic taste orthorhombic structure refractive index 1.5452 density 4.20 g/cm very hygroscopic melts at 394°C vaporizes at 650°C highly soluble in water 447g/100 mL at 20°C aqueous solution acidic very soluble in alcohol, ether, and acetone soluble in alkali hydroxides and ammonia solution. 

The heptahydrate, ZnS04 7H20, is a colorless crystalline solid metallic taste rhombohedral crystals effloresces refractive index 1.457 density 1.957 g/cm3 at 25°C melts at 100°C loses all its water molecules at 280°C decomposes above 500°C very soluble in water, 96.5 g/lOOmL at 20°C soluble in glycerol, 40 g/100 mL insoluble in alcohol. 

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