permitted to upgrade rejected material and submit the upgraded material as a new lot. However, in case of a second rejection, the charges made by the spacer producer and the tube manufacturer in connection with the second series of tests shall be borne by the seller. This specification covers tantalum ore suitable for the production of tantaluma double fluoride, tantalum oxide, and tantalum metal. 2. Chemical and physical requirements A. Chemical requirements: Tantalum pentoxide (Ta,О5) Combined tantalum and columbium pentoxides (T2O5 Minimum 40% Stannous dioxide (SnO2). Minimum__ 70% Maximum. Titanium dioxide (TiO2). Maximum_. Combined stannous and titanium dioxides (SnO, plus Maximum.. B. Physical requirements: Ore in its natural state will suffice. 3. Packaging Material shall be packed in steel drums or hardwood barrels or kegs. Con tainers may be of any standard type, but all containers comprising a 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. 2. Chemical and physical requirements a. Chemical requirements: Material shall conform to the following chemical specifications for the appropriate Grade: Tin content is to be determined as the difference between 100 percent and the total content of the listed impurities, whether or not maximum limits for each such impurity are specified. b. Physical requirements: All material shall be in the form of pigs. Pigs may be of any size and shape usual with the producer, but all pigs comprising a single shipment shall be of the same nominal size and shape. The surface of the pigs shall be clean and free from foreign material. All pigs shall be legibly marked with the producer's Brand name, either in casting or by stamping or indelibly printing. Each shipment shall be identified with the name of the producer. 3. Packaging Pigs may be supplied loose or in any standard type of container. Containers shall be so constructed as to withstand rough handling. All containers comprising a given shipment shall be of the same nominal size and shape. 4. Inspection Except in the case of "qualified" Brands, as defined below, each shipment shall be subject to inspection and analysis by the purchaser or its designee to determine conformity with the chemical requirements for the Grade to which supplied and to other requirements of this specification. The purchaser will from time to time designate "qualified" Brands, stipulating the effective period of such qualification. In the instance of such "qualified" Brands, the chemical inspection requirement will be waived for material produced within the ffective qualification period. Qualification shall be accomplished, at the request of the supplier, by submission to the purchaser of satisfactory evidence that the immediately preceding six months' production of the Brand to be qualified averaged within the chemical limits of the Grade under which qualification is desired, and that not more than 10 percent of that production has fallen outside said specification, and to only a nominal degree. Upon acceptance of the above evidence, the purchaser will then designate the Brand as "qualified" for the appropriate Grade. All material bearing that Brand, and which was produced during the six-month period immediately preceding qualification, or is produced during a stated effective period immediately following qualification, will be accepted as good delivery against this specification without chemical inspection. P-37 18 January 1945 ARMY AND NAVY MUNITIONS BOARD WASHINGTON, D. c. MATERIAL PURCHASE SPECIFICATIONS TUNGSTEN 1. Description This specification covers high-grade tungsten ores and concentrates of the following Types: A. Ferberite: Defined as containing tungsten primarily as FeWO1, with not more than 20 percent of the tungsten as MnWO. B. Hubnerite: Defined as containing tungsten primarily as MnWO,, with not more than 20 percent of the tungsten as FeWO.. C. Wolframite: Defined as containing tungsten as both FeWO, and MnWO, in any proportions from 80 percent FeWO, and 20 percent MnWO, to 20 percent FeWO, and 80 percent MnWO1. D. Natural Scheelite: Defined as containing, in nature, tungsten as CaWO.. E. Synthetic Scheelite: Defined as chemically precipitated scheelite produced from any natural Type of ore. 2. Chemical and physical requirements: a. Chemical requirements: Each lot of material purchased under this specification shall be of one of the five Types listed in paragraph 1 and shall conform to the following chemical limits for that Type: b. Physical requirements: Material of Types A through D shall be either natural ore, or concentrates produced from natural ore, and may be in the form of either lump or fines or a mixture of the two. Lumps shall not exceed one inch in size. Type E material shall be chemically precipitated scheelite produced from any original Type of ore, further processed such that not over 10 percent of any lot shall pass a 35-mesh Tyler Standard Screen. 3. Packaging Material shall be packed in steel drums or hardwood barrels or kegs. Containers may be of any standard type, but all containers comprising a given lot shall be of the same nominal size and shape. 4. Inspection Material shall be subject to inspection and analysis of each lot by the purchaser or its designee. This specification covers one grade (grade A) of fused black vanadium oxide suitable for manufacture of ferrovanadium and special alloys, direct additions to alloy steel, or the manufacture of vanadium chemicals. 2. Chemical and physical requirements a. Chemical requirements: Each lot of material purchased under this specification shall conform to the following chemical limits: Vanadium Pentoxide V2O.- Phosphorus (P). Sulphur (S)- Insolubles* Percent by Weight (Dry Basis) Minimum_- 86.00 Maximum__ Maximum__ .05 .15 Maximum.. .05 *Determined by adding to a one-gram sample 10 cc. of concentrated hydrochloric acid and 30 ec. of 1:1 sulfuric acid solution, heating to fumes of SO3, cooling, diluting with water to 125 cc., dissolving all salts, filtering on Whatman No. 40 filter paper, washing thoroughly, igniting, cooling, and weighing the residue. Not more than one chemical analysis shall be included in any lot. b. Physical requirements: Material shall be in broken, crushed, or flake form. All material shall pass a 2-inch screen. It is desirable that a minimum portion of any lot pass a 4-mesh Tyler standard screen. 3. Packaging Material shall be packed in steel drums or oak barrels or kegs. Content of any individual container shall not exceed 500 pounds. 4. Inspection Materials shall be subject to inspection and analysis by the purchaser or its designee. This specification covers slab zine of the following Grades: Special High Grade High Grade Intermediate Brass Special Selected Prime Western 2. Chemical and physical requirements and other quality tests a. Chemical requirements and other quality tests: All material will be purchased as one of the Grades listed in Paragraph 1 hereof and shall conform to the requirements for that Grade as covered by Specification B-6 of the American Society for Testing Materials, latest revision. b. Physical requirements: All material shall be in slab form. Slabs may be of any size normal with the producer, but all slabs in each lot shall be of the same nominal size and shape. 3. Inspection Material shall be subject to inspection and analysis by the purchaser or its designee. This specification covers two Types ("A” and “B”) of baddeleyite, the national zirconium dioxide, sometimes called zircite or zirkite, intended for the produc tion of ceramics and the alloy ferrozirconium, respectively. b. Physical requirements: Not more than 25 percent of any lot of either Type "A" or Type "B" material shall pass a 12-inch Tyler Standard Screen. 3. Packaging Material shall be supplied in bulk. 4. Inspection Material shall be subject to inspection and analysis by the purchaser or its designee. This specification covers zircon (zirconium silicate) intended primarily for ceramic and refractory applications. |