422 



THE INDIA RUBBER WORLD 



No. GS 10S2X1. 



Valve insidcs: Schrader's 1801 or approved equivalent. 



GS 1083X1. 



Tire gage: Schrader's straight Universal gage or approved 

 equivalent for small cars or motorcycles. 

 GS 1083X1. 



Schrader's right angle gauge or approved equivalent for large 

 cars and pneumatic tired trucks. 



GS 1084X1. 



Pump connection: Schrader's Universal No. 2238 or ap- 

 proved equivalent. 



GS 1085X1. 



Deflating caps: Schrader's No. 1886 or approved equivalent. 



GS 1086X1. 



Valve repair tool : Schrader's No. 239S or approved equivalent. 

 ■The power to approve equivalents is vested only in the Gov- 

 ernment. 



REPAIR KITS. 

 GS 1090. 



Repair kits shall be made up with the following material, 

 packed in a round cardboard carton with tin ends and cover, ap- 

 proximately 2^ inches in diameter and 2^ inches deep. 

 It shall contain : 

 Six cementless patches. 



Strip of cured back tube gum 2 by 8 inches. 

 Tube of cement 2K> by i/<-inch diameter, or equivalent. 

 Piece of sandpaper 2 by 8 inches, or equivalent. 

 Two valve insides, Schrader's 1801 (GS 1082X1), or 



approved equivalent. 

 Two valve caps, Schrader's 880 (GS 1081X1), or ap- 

 proved equivalent. 

 Carton to be labeled as follows : 



war department standard inner tube repair kit. 



Directions. 



For Temporary Tube Repairs. 



For repairing sm.ill punctures use "Cementless Patches." 



Roughen the tube with sandpaper, then apply cement and allow to 



dry. Remove cloth from patch and apply. Tube can be used at 



For repairing blowouts use combination repair stock. Roughen 

 tube around cut with sandpaper, then apply coat of cement around 

 cut inside and outside of tube. Allow to dry. Cut piece combina- 

 tion stock 54 -inch larger in all dimensions than cut and place inside 

 of tube, bringing edges of cut together over center of stock. Apply 

 another coat of cement outside of tube and allow to dry. Cut and 

 place same size piece of combination stock on outside of tube over 

 center of blow-out. Tube can be used immediately. 



Note: Always remove cloth from patch and combination stock 

 before applying and place cloth side next to tube. 



REPAIR MATERIAL FOR PNEUMATIC TIRES. 



See General Specifications for Tires', which are a part hereof. 



FABRICS (ONLY FOUK TYPES NECESSARY). 

 GS 1091X1. 



Square- Woven Building Fabric: This fabric shall be 17% 

 ounces per square yard with an allowable variation of 3 per 

 cent plus or minus. It shall be 23 by 23 weave. The fabric shall be 

 made from long-staple cotton with a tensile strength for each 

 warp and filling of at least ISO pounds per inch. Methods of 

 testing to be the same as specified in the fabric casing specifica- 

 tions. The fabric shall be frictioned both sides and skim-coated 

 one side to a minimum gage of 0.047-inch. 



GS 1091X2. 



Cord Builder Fabric: This fabric shall be made from long- 

 staple carded Egyptian or combed peeler cotton, or their physical 

 equivalent, as approved by the Government, weighing not less 

 than 13 nor more than 16 ounces per square yard. The cord 

 fabric shall be frictioned or spread both sides and skim-coated 

 equally on both sides to a gage of 0.050-inch. 



GS 1091X3. 



Bead Fabric, Square Woven. — This fabric shall weigh at 

 least 8 ounces per square yard. It shall be made from long- 

 staple cotton and shall be frictioned both sides. 



GS 1091X4. 



Breaker Fabric. — This breaker shall be an open-weave fabric 

 of at least 10 ounces per square yard. It shall be made from 



long-staple cotton. It shall be frictioned or spread and also 

 skim-coated equally on both sides. The minimum gage shall 

 be 0.070-inch. 



GS 1092. 



COMPOUNDS (ONLY THREE STOCKS NECESSARY). 



GS 1092X1, 



Friction, Seam. Cushion, and Tube Repair Stock : (a) Specific 

 gravity not to be over 1.30. These shall be made from and have 

 the characteristics of a compound containing at least 65 per cent 

 by volume of new rubber. 



(b) Two tread stocks shall be used. There shall be a black 

 stock of specific gravity not over 1.60 and a white or grey stock 

 of specific gravity not over 1.90. The treads shall be made 

 from and have the characteristics of a compound containing at 

 least 50 per cent by volume of new rubber. The kind and 

 quality of the reclaimed rubber must be declared when used. 

 "The tensile strength of a properly cured tread sample shall be 

 2,000 pounds per square inch, with a minimum elongation of 

 400 per cent (2 to 10 inches). The permanent set shall not ex- 

 ceed 30 per cent after an elongation of 350 per cent (2 to 9 

 inches). 



(c) Side wall stocks. Use tread stock. 



(d) Retread semi-cured bands. Use repair tread stock specifi- 

 cations. 



(c) Cured-back tube stock. The uncured stocks used must 

 fill the specifications for the friction coat and cushion stocks. 

 The gage of the raw gum shall be not less than 0.015. 

 The gage of the cured gum shall be not less than 0.032. 



GS 1093. 



CEMENTS (TWO CEMENTS ONLY). 



GS 1093X1. 



(o) Vulcanizing cement shall be made from a compound 

 having a maximum specific gravity of 1.15 containing at least 

 75 per cent by volume of new rubber. It shall be dissolved in 

 benzol. The rubber compound content by weight to be determined 

 by evaporation and milled to constant weight, shall be not less 

 than 17 per cent of the total weight of the cement. 



GS 1093X2. 



(6) Acid cure cement: This cement to be made from new 

 rubber with no other ingredients than a benzol solvent. The 

 pure rubber content weight to be determined by evaporation 

 and milled to a constant weight, shall be not less than 6 per 

 cent of the total weight of the cement. The acid solution used 

 with this cement shall be 2 per cent monochloride of sulphur and 

 98 per cent benzol. 



CURE. 



The base cure on a 4-inch section for repair material should be 

 based on 45 minutes at 50 pounds steam pressure, it being under- 

 stood that cure is to be made under proper conditions. 



VALVE BASES. 

 GS 1094. 



Two sizes designated as large and small will be required. 

 The standard commercial, after sample bases have been sub- 

 mitted to and approved by the Government, will be accepted. 



AIR BAGS. 

 GS 1095. 



The air bags shall be made according to the standard practice 

 and design of the manufacturer. A sample section of the bag 

 showing the end reinforcement and cross section of the bag must 

 be submitted to the Government for approval. Bags must be 

 tested with 100 pounds air pressure and show no leaks when 

 immersed in water. 



PRICES. 



Repair materials will be purchased on a pound basis. For com- 

 parison of difTerent quotations the specific gravity and price on 

 the basis of volume must be submitted by the bidder in addition 

 to the price on a weight basis, it being understood that the 

 volume price shall be the price per square yard of the gage 

 specified in the request for bid. 



The Langen (Java) Rubber Estates Co., Limited, reports 

 that of its 4,427 acres, 2,377 are planted with Hevea rubber and 

 of these 1,979 acres are being tapped. The rubber yield for 

 the fiscal year, closing with the end of August, 1919, was 700,- 

 222; the average net sale price was Is. 9.\d. per pound, the cos 

 of production, f. o. b. at port of shipment wa; 11.43£f. per pound 

 The estimated crop for 191?. 1920 is 8SO,0OC jeunds. The ne 

 profits were £28,297. 



