TAILIEUCHUNG - Materials Handbook 2008 Part 3

Tham khảo tài liệu 'materials handbook 2008 part 3', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 140 BROMINE brushes. The taper of the bristle gives the brush stiffness at the base and resiliency toward the end. Quality varies according to the type of animal climate and feeding. The colors are white yellow gray and black. They are graded by locality color and length and in normal times the name of the place at which they are graded such as Tsingtao Hankow and Chungking is an indication of the grade. The best fibers are more than 3 in cm in length. The Chinese natural black bristles are sometimes sold at a premium. The . bristles from Chester hogs are light in color and of high quality. Bristles from the Duroc hog are bronze in color stiff and superior to most Chinese grades. Those from the Poland China hogs are black and stiff but they have a crooked flag and are of poor quality. Artificial bristles are made from various plastics the nylon bristles being of high quality and much used. Exton of Du Pont was one of the original nylon monofilament nontapered bristles. Tynex of this company now comes both tapered and level. They are more durable than natural bristles. Casein bristles are made by extruding an acid solution of casein stretching the fiber and insolubilizing with formaldehyde or other chemicals. They have good paint-carrying capacity and good wear resistance but are dissolved by some paint solvents. Keron bristle of Rubberset Co. is produced from the protein extracted from chicken feathers. It is nearly identical in composition to natural bristle. BROMINE. An elementary material symbol Br. It is a reddish-brown liquid having a boiling point of 138 F 59 C . It gives off very irritating fumes and is highly corrosive. It is one of four elements called halogens a name derived from Greek words meaning salt producer. They are fluorine chlorine iodine and bromine. They are all chemically active combining with hydrogen and most metals to form halides. Bromine is less active than chlorine but more so than iodine. It is moderately soluble in water. It .

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