This specification covers two Types ("A" and "B") of refractory grade chro mium ore, each of which is suitable for the manufacture of a specific type of refractory. Type "A" originates in Southern Rhodesia and is suitable for the production of plastic monolithic refractory in marine boilers, stationary boilers, furnace hearths and linings. Type "B" originates in the Philippine Islands (Masinloc ore) and the Camaguey and Moa Bay Districts of Cuba, and is suitab for the production of all other chromium type refractories. 2. Chemical and physical requirements a. Type "A" material shall conform to the following chemical specifications, Chromic Oxide (Cr2O3). Iron (Fe)-‒‒‒‒ Silica (SiO2) – Minimum. 44 Maximum. 12 and shall consist of "lump ore" of which all shall pass a 10-inch screen but not more than 20 percent shall pass a Tyler Standard 1⁄2-inch screen. In addition to conforming to the above chemical and size specifications, Typ* "A" material shall be submitted for the approval of manufacturers who ar producing a satisfactory refractory material for the lining of marine boilers t C. S. Navy Specifications. Failure of qualified manufacturers to certify that the material has physical characteristics suitable to the production of refractory meeting such U. S. Navy Specifications shall constitute a rejection of the material, regardless of conformance to the chemical and size specifications above listed. b. Type "B" material, depending on its origin, shall conform to the following chemical specifications: and shall consist of "lump ore" of which all lumps shall pass a 10-inch screen. In the instance of Camaguey and Moa Bay ore, not more than 20 percent shall pass a Tyler Standard 10-mesh screen. In the instance of Masinloc ore, no more than 5 percent shall pass a Tyler Standard 8-mesh screen. 3. Packaging Both types of ore shall be supplied in bulk. 4. Inspection Material shall be subject to inspection and analysis by the purchaser or its designee. Inspection of Type "A" material shall include the practical approval of samples as required by Paragraph 2a hereof. This specification covers refined cobalt suitable for the production of ferrous and nonferrous alloys. 2. Chemical and physical requirements a. Chemical Requirements: Each lot of cobalt metal shall conform to the following: b. Physical Requirements: Material shall be supplied in rondelles or other small lump or granular form. All material shall pass a two-inch screen, and none shall pass a 6-mesh Tyler Standard Screen. All material in any one lot shall be of the same approximate size. 3. Packaging Material shall be packed in steel drums, or hardwood barrels or kegs. Containers may be of any size usual with the producer, but all containers comprising any given lot shall be of the same nominal size and shape. 4. Inspection Material shall be subject to inspection and analysis by the purchaser or its designee. This specification covers columbium ore suitable for the manufacture of ferrocolumbium. b. Physical Requirements: There shall be no restriction as to size. Ore in its natural state will suffice. 3. Packaging Con Material shall be packed in steel drums or hardwood barrels or kegs. tainers may be of any standard size, but all material in a given lot shall be packed in containers of the same nominal size and shape. 4. Inspection Material will be accepted on the basis of inspection and analysis by the purchaser or its designee. P-16 1 May 1948 (Supersedes Issue of 21 September 1944) MUNITIONS BOARD WASHINGTON, D. C. MATERIAL-PURCHASE SPECIFICATIONS COPPER 1. Description This specification covers the following Types of Copper: II Electrolytic copper wire bars. III Low Resistance Lake copper ingot bars. IV Fire Refined (other than Lake) copper ingot bars. 2. Chemical and physical requirements and other quality tests Type I material shall conform to the requirements of A. S. T. M. Specification B-115, latest revision in effect on date of contract. Cathodes may be of any size usual with the producer, but not less than 30 by 30 inches, and all cathodes supplied against a given contract shall be of the same nominal size. Type II material shall conform to the requirements of A. S. T. M. Specification B-5, latest revision in effect on date of contract. All material shall be in the form of 250-pound wire bars. Type III material shall conform to the requirements for low resistance Lake copper as set forth in A. S. T. M. Specification B-4, latest revision in effect on date of contract. All material shall be in the form of 50-pound ingot bars. Type IV material shall conform to the requirements of A. S. T. M. Specification B-216, latest revision in effect on date of contract. All material shall be in the form of 50-pound ingot bars. 3. Inspection Material shall be subject to inspection and analysis by the purchaser or its designee. This specification covers two Grades (A and B) of crystal corundum, intended primarily for abrasive use. 2. Chemical, physical, and hardness requirements a. Chemical Requirements: Each lot of Grade A crystal corundum shall contain not less than 92 percent alumina (Al2O3). Each lot of Grade B crystal corundum shall contain not less than 90 percent alumina (Al2O3). b. Physical Requirements: Not more than 5 percent of each lot of Grade A crystal corundum shall pass through a 3 mesh U. S. Standard Screen. Not more than 5 percent of each lot of Grade B crystal corundum shall pass hrough a 7 mesh U. S. Standard Screen. e. Hardness Requirements: Of each lot of material, not less than 95 percent hall have a hardness equal to or exceeding nine (9) on Moh's Scale. . Packaging Material shall be supplied either in bags or in other containers standard with he producer. All bags or containers comprising any given lot shall be of the ame nominal size and shape. Inspection Material shall be subject to inspection and analysis by the purchaser or its esignee. This specification covers industrial diamonds of the following classes: a. Smaller than 24 per carat. b. 24 per carat to 10 per carat. Class 2-Thread Grinding Stones: a. Smaller than 10 per carat. c. 1 carat to 2 carat. d. 2 carat to 4 carat. e. Larger than 4 carat. (2) Second Quality. Class 4-Shaping, Boring, and Turning Tool Stones: a. Each lot shall be offered either as sorted diamonds of a single Class and Subclass listed in Paragraph 1 hereof, or as a series or mixture of such Classes and Subclasses. In the latter case, the approximate distribution within the series shall be either stated in advance or shall parallel that of a sample lot previously offered for inspection. 76100-48-pts. 4 and 5-27 b. All diamonds shall meet industry standards for the Class and Subclas claimed. 3. Packaging Diamonds may be packed in any manner usual with the seller. Each lot sha be separately packed and identified. 4. Classification and inspection Each lot of diamonds shall be classified according to the Classes and Subclass listed in Paragraph 1 hereof, and shall be inspected for conformance with th requirements of Paragraph 2 hereof. Diamonds will be subject to classification and inspection by the purchaser its designee. This specification covers high-carbon lump amorphous graphite of Ceylon origi or equal. The material is intended primarily for the manufacture of carb brushes for electrical equipment. 2. Quality and size requirements a. Quality Requirements: (1) All material purchased under this specificatio shall contain a minimum of 97 percent graphitic carbon in a moisture-free sample The determination shall be made as the difference between 100 percent and th total percentage of ash plus volatile matter. (2) The lumps shall have an unctuous feel, a conchoidal fracture, and lustrou fracture faces. (3) The lumps shall not be dull, hard, or cokey in appearance, and shall no contain tough needle or flakey crystal formations characteristic of the graphit used for the manufacture of crucibles. b. Size Requirements: No lumps shall exceed 5 inches in diameter. Not mor than 3 percent of any lot shall pass a 10 mesh United States Standard Screen 3. Packaging All material shall be packed in steel drums, or hardwood barrels or kegs. Con tainers may be of any normal size and shape, but all containers comprising a giver lot shall be of the same nominal size and shape. 4. Inspection Each lot of material shall be subject to sampling, inspection, and analysis by the United States Customs Laboratory as the inspecting agent for the purchaser This specification covers crystalline flake graphite suitable for use, after usual industry processing, in the manufacture of graphite crucibles. |