Materials,Parts and Finishes

Barium

Barium (symbol Ba) is a metallic element that occurs in combination in the minerals witherite and barite, which are widely distributed. The metal is silvery white in color and can be obtained by electrolysis from the chloride, but it oxidizes so easily that it is difficult to obtain in the metallic state. Its melting point […]

Bearing materials

A large variety of metals and nonmetallic materials in monolithic and composite (laminate) form are used for bearings. Monolithic ferrous bearings are made of gray cast iron, pressed and sintered iron and steel powder, and many wrought steels, including low-carbon and high-carbon plain-carbon steels, low-alloy steels, alloy steels, stainless steels, and tool steels. Most cast-iron […]

Benzene

A colorless, liquid, inflammable, aromatic hydrocarbon which boils at 80.1 °C and freezes at 5.4 to 5.5°C. Benzene is used as a solvent and particularly in Europe as a constituent of motor fuel. In the United States the largest uses of benzene are for the manufacture of styrene and phenol. Other important outlets are in […]

Beryl

At least 50 different beryllium-bearing minerals are known, but in only about 30 is it a regular constituent. The only beryllium-bearing mineral of industrial importance is beryl, a hexagonal beryllium-aluminum silicate with the ideal composition Be3Al2Si6O18, equivalent to 5% beryllium or 14% beryllium oxide, 19% A12O3, and 67% SiO2. The precious forms of beryl, emerald […]

Beryllium

Among structural metals, beryllium (symbol Be) has a unique combination of properties. It has low density (two thirds that of aluminum), high modulus per weight (five times that of ultra strength steels), high specific heat, high strength per density, excellent dimensional stability, and transparency to x-rays. Beryllium is expensive, however, and its impact strength is […]

Beryllium alloys

Dilute alloys of base metals that contain a few percent of beryllium in a precipitation-hardening system are the principal useful beryllium alloys manufactured today. Although beryllium has some solid solubility in copper, silver, gold, nickel, colbalt, platinum, palladium, and iron and forms precipitation-hardening alloys with these metals, the copper-beryllium system and, to a considerably lesser […]

Beryllium oxide

A colorless to white crystalline powder of the composition beryllium oxide, also called beryl-lia. It has a specific gravity of 3.025, a high melting point, about 2585°C, and a Knoop hardness of 2000. It is used for polishing hard metals and for making hot-pressed ceramic parts. Its high heat resistance and thermal conductivity make it […]

Bismuth

Bismuth (symbol Bi) is a brittle, crystalline metal with a high metallic luster with a distinctive pinkish tinge. The metal is easily cast but not readily formed by working. Within a narrow range of temperature, around 225°C, it can be extruded. Its crystal structure is rhombohedral. It is one of the few metals that expand […]

Bituminous coatings

Bitumens have been defined as mixtures of hydrocarbons of natural or pyrogenous origin or combinations of both (frequently accompanied by their nonmetallic derivatives), which can be gaseous, liquid, semisolid, or solid and which are completely soluble in carbon disulfide. Bitumens used in the manufacture of coatings are of the semisolid and solid variety and are […]

Blow molding

Essentially, blow molding involves trapping a hollow tube of thermoplastic material in a mold. Air pressure applied to the inside of the heated tube blows the tube out to take the shape of the mold. There are many variations on the basic technique. In short, the process is an economical high speed, high-production-rate method of […]

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