THE INDIA RUBBER WORLD 



[Septf.mder 1, 1920. 



(d) Oil. — One-foot section, with both ends plugged, shall be 

 immersed for 48 hours in medium gas engine cylinder oil be- 

 tween 70 degrees and 80 degrees K. and immediately wiped clean 

 before resting. Test pieces to be cut al least four inches from 

 either end. 



T.\BLE. 



Size, as 

 Thickness: Specified. 



Tube, minimum , inch A 



Tensile:' 



Original tube and cover, minimum pounds 600 



After steaming tube, minimum 400 



After immersed in oil, cover, minimum 400 



Ultimate elongation: 



Original tube and cover, minimum inches 2-6 



After steaming tube, minimum 2-5 



After immersed in oil, cover, minimum 2-5 



Friction: 



Before steaming, minimum pounds 15 



After steaming, minimum 10 



Fabric: 



Weight per square yard, minimum ounces 10.8 



Number of plies 2 inches and under, minimum 3 



Number of plies over 2 inches, minimum 4 



DIVERS' HOSE. 



War Department Specification, No. 333-1-6 — June 5, 1919. 

 (AuTHOBiTv OF Suppi.Y CIRCULAR No. 8. P. S. & T. Div.. January 24, 1919.) 



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

 hose to be used for conducting air in diving apparatus. 



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

 General Specification for Mechanical Rublier 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) The cotton reinforcement shall consist of three braided 

 layers, well embedded in the rubber compound to meet all tests 

 described below. 



(6) Dimensions to conform with the following table. 



(f ) The washers shall be of leather, 1/16-inch in thickness. 



(d) Each length shall have a rubber cap at least 1/16-inch 

 thick. 



Branding.— See General Specifications. 



(a) Use the word "Divers." 



Material. — See General Specifications. 



(a) Tube and cover shall contain not less than 30 per cent 

 fine Para rubber, not more than 2^ per cent sulphur, nor more 

 than V/z per cent waxy hydrocarbon, with the remainder suitable 

 dry, inorganic mineral fillers. 



Inspection. — See General Specifications. 



(a) The inspector shall cut a 3-foot section from one length 

 out of every lot of ten (50-foot lengths) or less; or take one in 

 every 50 short lengths for test. 



(fc) For each lot of fifty 3-foot lengths one extra length shall 

 be furnished for lest purposes. 



Tests. — See General Specifications. 



(a) To conform with the following table. 



lb) Constricted part of test specimen shall be % by two 

 inches. 



O. D. lengths l-h inches, 3 or 50 feet. 



Hydrostatic for couplings 250 pounds for 10 minutes. 



Tests : burst 1 ,000 pounds. 



Friction 20 pounds. 



Tensile: 



Tube 1,200 pounds. 



Cover 1 ,000 pounds. 



Ultimate elongation : 



Tube 2 to 9 inches. 



Cover 2 to 9 inches. 



Stretch 2 to 7 inches. 



Set 25 per cent (maximum). 



Tolerance, plus or minus Vaz-inch. 



CHEMICAL ENGINE HOSE. 



War Department Speciaoation, No. 333-1-S — June 6, 1919. 

 'Authority or Supply Circular \o. 8. P. S. & T. Div., January 24. 1919.) 

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

 chemical engine hose for use with hand chemical fire extinguish- 

 ers, and chemical engines. 



(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. 



(o) Dimensions to conform with the following table. 



Branding. — See General Specifications. 



(a) Branding to be black. 



(b) Use the word "Chemical." 

 Materi.'VL. — See General Specifications. 



(<i) Tube, cover, washers, and friction shall contain not less 

 than 35 per cent fine Para and not more than 3 per cent sul- 

 phur ; the remainder to consist of suitable dry inorganic mineral 

 fillers. The use of carbonates will not be permitted. 



(b) Cover shall be red. 



Inspection.— Sec General Specifications. 



Tests. — See General Specifications and following table. 



(o) Test pieces of tube and cover shall be subjected to an 

 accelerated aging test of 96 hours in dry heat at 158 degrees F., 

 plus or minus 2 degrees. 



Table. 



i^Inch. H-Inch. J^-Inch 1-Inch. 



Tolerance (I. D.), plus TT minus.. «.c;. Vm V„ V», V« 



Thickness. 



Tube, minimum A ,V A A 



Cover, minimum V30 V.« '}» Vm 



Hydrostatic test: 



Coupling, minimum pounds 150 150 1.S0 150 



Burst, minimum 500 500 500 SCO 



Friction ..; 15 15 15 15 



Tensile: 



Tube, minimum . . .•. 1,500 1,500 1,500 1,500 



Cover, minimum 1.300 1.30O 1,300 L,300 



After agins: 



Tube, minimum 900 9O0 90O 900 



Cover, minimum 80O 800 800 800 



Ultimate elongation, minimum. inches 2-11 2-11 2-11 2-11 



Permanent set: 



Tube and cover, stretch for 10 ^ 



minutes, then release, minimum ~^ 



inches 2-10 2-10 210 2-10 



Per cent set after 10 minute rest, 



maximum 25 25 25 2S 



GAS HOSE. 



(A) ACETYLENE-HYDROGEN HOSE. (B1 OXYGEN HOSE. 



War Department Specification, No, 333-1-2 — June 6, 1919. 



(Authority of Supply Circular No. 8. P. S. & T. Div., January 24, 1919.) 



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

 hose to be used in carrying acetylene, oxygen, and hydrogen gas. 



(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 confTict. In such cases the word and meaning of this 

 .specification will govern. 



(a) Dimensions. — See the following table. 



(b) Rubber cover shall be red for acetylene-hydrogen hose; 

 black for oxygen hose. 



Branding. — See General Specifications. 



(a) The red covered hose shall have black brands. 



(b) For acetylene-hydrogen hose use the letters ".-XCET- 

 HYD ;" for oxygen the letters "OXY." 



Material. — See General Specifications. 



(a) The fabric plies shall be of sheeting or a plain weave 

 fabric. 



iNSPEcrriON. — See General Specifications. 



Tests. — See General Specifications and following table. 



Table. 



Size Inches A« plus or minus Vm 



Outside diameter ^, plus or minus Vti- 



Thickness: 



Cover Vm-A 



Tensile: 



Tube, minimum pounds 500 



Cover, minimum 450 



Ultimate elongation: 



Tube and cover, minimum inches 2-6 



Hydrortatk':"'"""" 



Coupling, minimum 250 



Burst, minimum 500 



DREDGING SLEEVES. 



War Department Specification. No. 833-1-4 — June 5. 1919. 

 lAurnnRiTv nr Supply Circular X... 8. P S. & T. Div., January 24, 1919.) 

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

 dredging sleeves to be used on hvdraulic dredges. 



(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) Sleeves shall consist of a rubber tube, cotton canvas lay- 

 ers, and rubber cover. 



(b) Between the center plies there shall be a 1/32-inch layer of 

 rubber compound. See General Specification. 



(c) Ends to be capped with same rubber compound as in the 

 tube. 



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



