THE INDIA RUBBER WORLD 



805 



War Department Specifications for Mechanical Rubber Goods — 111.' 



WAR Department Specikkations No. 333-1-1, frequently re- 

 ferred to in the following specifications, were published 

 in TiiK IN-DIA RiiiiiKK Wc.Ri.u January 1, 1920. 

 RUBBER TRANSMISSION BELTING. 



War Department SpeciScation. No. 333-3-1— June 6. 1919. 

 (Authority of Sm-plv ciklllak .\u. 8, 1'. S. S: T. Div.. January 2-4. 1919.) 



General. — (a) This specification covers the requirements for 

 friction surface rubber belting to be used for power transmission. 



(6) See War Department Specification No. 333-1-1, headed 

 General Specification for Mechanical Rubber Goods^ which is 

 made a part hereof, except in such cases as the provisions be- 

 low directly conflict. In such cases the word and meaning of 

 this specification will govern. 



Construction. — Sec General Specifications. 



(a) Seam in outside ply shall be filled wtth a rubber cord or 

 beading, fastened down with a rubber cover strip about one- 

 half inch wide. 



Branding. — See General Specifications. 



(o) Use word "Transmission." 



Material. — See General Specifications. 



(a) Cotton duck shall weigh at least 27.4 ounces per square 

 yard. 



I.NSPECTiON. — See General Specifications. 



(a) Inspector shall cut sample 12 inches long from belts four 

 inches or under in width, four inches long from belts above 

 four inches in width, from each roll of belting. 



Tests. — See General Specifications. 



(a) F.\BRic. — The warp must show a tensile strength not 

 less than 260 pounds and the filler 170 pounds. 



(b) Friction. — The friction shall be determined by stripping 

 off two plies and separating them at the rate of one inch per 

 minute. Additional test specimens shall be used for the alternate 

 plies until all plies are tested. The average of all plies to be 

 considered the friction strength, which shall not be less than 18 

 pounds for belting four inches wide and over and 17 pounds for 

 belts less than four inches wide 



BALATA BELTING. 



War Department Specification. No. 333-3-2-June 5, 1919. 

 (Authority of Supply Circular No. K, P. S. & T. Div., January 24, 1919.) 



General. — (a) This specification covers the requirements for 

 balata belting to be used for power transmission, elevator, and 

 conveyor up to a temperature not exceeding 110 degrees F. 



(b) See War Department Specification No. 333-1-1, headed 

 General Specification for Mechanical Rubber Goods^, which is 

 made a part hereof, except in such cases as the provisions be- 

 low directly conflict. In such cases the word and meaning of 

 this specification will govern. 



Construction. — See General Specifications. 



(a) The duck shall be thoroughly impregnated with balata. 



Branding. — See General Specifications. 



(a) Use the word "Balata." Brand with stencil. 



Material. — See General Specifications. 



(a) Cotton duck shall weigh not less than 29 ounces per 

 square yard and have not less than 8-ply warp yarn and 5-ply 

 filling yarn. 



(b) ' The impregnating material shall be chemically neutral 

 in character, permanently pliable, and free from any substance 

 injurious to the untreated fabric, and unaffected by exposure to 

 atmospheric conditions and water. 



Inspection. — See General Specifications. 



(a) Inspector shall cut off sample 12 inches long from belts 

 four inches or under in width, four inches long from belts above 

 four inches in width, from each roll of belting. 



Tests. — See General Specifications. 



Fabric. — (a) The untreated duck shall have a tensile strength 

 of at least 250 pounds in the warp and 200 pounds in the filling. 



(b) The adhesion between the plies of fabric shall be de- 

 termined by separating two plies at a time at the rate of one 

 inch per minute. Additional test specimens shall he used for the 

 alternate plies until all plies arc tested. The average of all plies 

 to be considered the adhesion strength, which shall be at least 

 12 pounds. 



CORRUGATED TENDER HOSE. 



War Department Speoifioation, No. 333-l-lS-Jun6 6, 1919, 

 (AfTHORiTv OF Supply C.RrrLAR No. S. P. S. & T. Div., January 24, 1919.) 

 General. — Co) This specification covers the requirements for 

 hose for conducting water between tender and locomotive. 



(b) See War Department Specification No. 333-1-1, headed 

 General Specification for Mechanical Rubber Goods^ which is 

 made a part hereof, except in such cases as the provisions below 

 directly conflict. In such cases the word and meaning of this 



specification will govern. 



Construction. — See General Specifications. 



(a) Dimensions to conform with the following table. 



(b) Made of an inner rubber tube; two plies of duck; a coil of 

 galvanized or copperized wire extending within three inches of end 

 of hose and thoroughly embedded in at least a 1/32-inch layer 

 of rubber of same compound as tube ; two plies of duck ; and an 

 outer rubber cover. 



Branding. — See General Specifications. 



(a) Use word "Tender." 



Material. — See General Specifications and following table. 



(a) Tube and friction shall be made of a rubber compound 

 best adapted to resist the continued action of hot water and 

 steam; the cover to resist water; abrasion, and other mechanical 

 injuries. 



Inspection. — See General Specifications. 



(a) Inspector may select at random for tests one length from 

 each and every shipment of 100 lengths or less. Tests shall be 

 performed on samples taken from soft ends. 



(6) If samples corresponding to any one lot fail to meet the 

 requirements, the contracting officer may reject that lot or may, 

 with the consent of the contractor, accept part or all of it at 

 not more than 75 per cent of the contract price : Provided, how- 

 ever, that it does not fall below by more than 10 per cent of the 

 requirements. 



Tests. — See General Specifications and following table. 



Table. 



2 'A 3 3y, 



Inches Inches Inches 



Tolerance, inside dianieter, plus or minus inch ^/m ^/aa '/si 



Outside diameter 354 3J4 4'4 



Tolerance, outside diameter, plus or minus- A i^ A 



Len^h, as specified in proposal. 



Length, tolerance, plus or minus ^i Vi % 



Thickness, tube and cover, minimum AAA 



Duck, plies, minimum 4 4 4 



Weight (square yards), minimum ounces 18 18 18 



Wire diameter inches 0.120 0.120 0.120 



Spacing maximum 44 J4 V* 



Thickness of rubber liner, minimum Vaj V»! />m 



Friction, minimum pounds 15 15 15 



Tensile: 



Tube, minimum 500 500 500 



Cover, minimum 450 450 450 



Ultimate elongation, lube and cover, minimum. .inc/i« 2-6 2-6 2-6 



RADIATOR HOSE. 



War Department Specification. No. 338-1-9 — June 5, 1919. 



(Authority of Supply Circular No. S. P. S. & T. Div., January 24, 1919.) 



General. — (a) This specification covers the requirements for 

 hose to be used between radiator and engine. 



(/7) See War Department Specification No. 333-1-1, headed 

 General Specification for Mechanical Rubber Goods", which is 

 made a part hereof, except in such cases as the provisions below 

 directly conflict. In such cases the word and meaning of this 

 specification will govern. 



Construction. — See General Specifications. 



(o) Dimensions to conform with the following table. 



(b) No couplings. 



Br.\nding. — See General Specifications- 

 Co) Use word "Radiator." 



Material. — See General Specifications and following table. 

 (a) Tube and friction shall be composed of a steam-resisting 

 coinpound ; cover of an oil-resisting compound. 

 Inspection. — See General Specifications. 



(a) Inspector may select at random four 3-foot sections from 

 each and every shipment of 2,000 feet or less. Two samples to be 

 used for steaming, two for oil tests. 



Tests. — See General Specifications and following table. 

 (o) Test specimens shall not be buffed. 



(b) In calculating the tensile strength after steaming and oil 

 tests, the thickness of test specimen shall be considered as 

 equal to that of the original test specimens. 



(c) Steaming.— Steam at 45 pounds pressure to be passed 

 through a 2-foot section for eight hours. (Hose to be provided 

 with open drain cocks to prevent filling with condensation.) 



■Continued from The India Rubber World. July 1, 1920, pages 649-651. 

 'See The India Rubber World, January 1, 1920, page 214. 



