Moisture graying

A 25% dispersion of NaH crystals ia oil is obtained. The commercial product, after filtration, is a 60% dispersion of NaH crystals (5—50 p.m). The oil dispersions can be handled quite safely because the oil phase provides a barrier to air and moisture, whereas the unprotected crystals react vigorously. Traces of unreacted sodium metal give the product a gray color. 

Properties. Anhydrous aluminum chloride is a hygroscopic, white soHd that reacts with moisture ia air. Properties are shown ia Table 1. Commercial grades vary ia color from light yellow to light gray as a result of impurities. Crystal size is dependent upon method of manufacture. At atmospheric pressure, anhydrous aluminum chloride sublimes at 180°C as the dimer [13845-12-0] Al2Qg, which dissociates to the monomer beginning at... 

Powdered Teflon for use in pyrots is covered by US Mil Spec MIL-P-48296IPA) (1 May 1974), Polytetrafluoroethylene (TFE) . Three classes of material are specified (1,2 3). The requirements are purity, 99.4% min infrared spectrum, peaks consistent with figure shown color, TFE shall be opaque and the color shall range from white to gray moisture, 0.05% max ash, 0.1% max mp, 337° 10°C packing density, Class 1 — 1.18 0.13g/cc, Class 2 - 1.25 0.02g/cc, Class 3- 1.14 0.09g/cc particle size by sieve analysis, Class 1 — 95 15 microns, Class 2 — 237 27 microns, Class 3 — 200 30 microns particle size distribution by sieve analysis, as specified in Table 1... 

Fig. 4.7.8 Moisture distribution in lasagna three sheets. The image data at one time point pasta as a function of distance from the surface is shown by the insert. The lighter gray is to the center (0.1 cm). The moisture profiles directly proportional to moisture content and are extracted from the central sheet of a set of occurs at the edge of the pasta sheet.

Anhydrous calcium sulfate is a crystalline substance orthorhombic the color may vary as white, gray, blue or brick-red occurs as insoluble anhydrite or porous soluble anhydrite density 2.96 g/cm hardness 3.5 Mohs insoluble anhydrite is practically insoluble in water (0.21% at 20°C) soluble anhydrite readily absorbs moisture and is soluble in water. 

Type 1 No 7 Mk 6 Model 3 Modification Bomb consisted of a sheet steel cylindrical body contg 182 cylindrical pellets arranged around a central cardboard tube contg gray igniter mixture (Ba nitrate 75, A1 24.5, oil 0.3 moisture 0.2%). 

Tungsten tetrachloride is an air and moisture-sensitive gray-green solid, which may be stored indefinitely under a dry nitrogen atmosphere. It is insoluble in common organic solvents. In addition to its use as a precursor for compounds... 

Partially fluorinated carbons (CFX) vary in color from gray to dark black. They are thermally less stable, particularly if the fluoride content is 0.2 < x < 0.5. They hydrolyze above 150 C in the presence of moisture and are susceptible to the attack of strong alkalis.12... 

Air- and moisture-sensitive complex cyanides of composition M5Zr(CN)5 (M = K or Rb) have been prepared by reaction at -50 °C in anhydrous ammonia of zirconium(III) bromide with an excess of either KCN or RbCN. In the case of the reaction involving KCN, the 1 3 distribution of zirconium between the gray, ammonia-insoluble K5Zr(CN)5 and the soluble zirconium(IV) products is in accord with the disproportionation shown in equation (1). The... 

Schapiro and Gray (36) have shown that microscopic voids commonly occur in Antarctic coals altered by igneous heating. These voids occur without necessarily affecting the megascopic appearance of the coal. Possibly coked coals such as this, which may be called cryptovesicular, include moisture in excess of that which is driven off by standard drying procedure. It is conceivable that unusual moisture relations would be reflected by the unusual samples. 

The solvent is removed by distillation from the steam bath, the final traces under 10-30 mm. pressure. The flask is allowed to cool with a calcium chloride tube attached, and the product crushed with a spatula and transferred to bottles sealed against moisture. The yield is 394-418 g. (80-85 Per cent °f the theoretical amount) of a white or slightly gray solid. 

Tungsten(VI) tetrabromide oxide is a dark-brown crystalline compound, which is obtained in the form of needles or flakes. It is extremely sensitive to atmospheric moisture, decomposes rapidly in water, which leaves a gray-green precipitate, and is completely dissolved in solutions of ammonia or sodium hydroxide, which form clear, colorless solutions. It is slightly soluble in concentrated hydrochloric acid, dioxane (yellow solution), 2-methoxyethanol (colorless solution), and acetone (green solution). It has a melting point of 322°C., as determined by D.T.A. 

AS is a white to brownish-gray crystalline salt that is soluble in water, but is only slightly soluble in ethanol. AS has excellent storage properties in bags and in bulk, and it does not require any anti-caking conditioners. This is because AS is resistant to moisture absorption and has a critical relative humidity of 79% at 30°C244. AS can be irritating when in contact with the skin or mucous... 

The mixture is stirred for an additional 30 minutes after completion of the I2 addition, and a steel-gray solution with a small amount of white flocculent precipitate is obtained. The sides of the flask are now rinsed with 200 ml. of benzene while dry nitrogen is blown over the surface of the solution to assure complete removal of traces of HI gas and exclusion of moisture. 

Na[Zn2(CH3)2H3] -xTHF is sensitive to air, moisture, and heat and must be stored in a closed container at - 78°. At room temperature, the compound slowly decomposes, changing from a white powder to first yellow, then gray, aggregates. It loses dimethylzinc and THF readily at room temperature, eventually becoming sodium trihydridozincate(l -). 

PROP Dark-gray or dark-yellow moisture-... 

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