190 



THE INDIA RUBBER WORLD 



[January 



to inside of tire bnnil and with a protective coating of silicate of 8oda 

 over the label. 



PNEUMATIC INNER TUBES (GREY). 

 Specification No. 1062A. 



NOVEMHEK 1, 1918. 



1. General. This specification covers the following sizes: 



(a) 28 by 3 31 by 4 36 by 6 



29 by ly, 33 by 4 36 by 7 



30 by 3'A 35 by 5 40 by 8 



(b) All tiilies itianufictured to this specification shall be of the endless 

 type, except motorcycle tubes which shall be butt end or endless as ordered. 



(c) All tubes shall he free from defects and guaranteed as to material 

 and workmanship. 



2. Compound, (a) Tube? 't-nll In •p:i.ir from and have the charac- 

 teristics of a compound cont.n m ,, .ininmnin of 93 per cent by volume 

 of the best quality new wild ! i i - i il.her. Sulphur content shall 

 not exceed 7 per cent by wci Icr used. 



(b) The (>it:;iiiif .ct-lnnc t t: ' . t iw i ;rr.i compound must not exceed 

 Sa per rev ' - -'■ . : ; ■ . M,l,i,cr i.sol. 



(c) r. ■ •■ •■ r ii,,,„ ingrcJiems known to the trade as oil 



3. C.A, 1 :\\ till tlic specification in the following table 

 for miniiv ; - ze. minimum gages and minimum length. 



Minimum Minimum Minimum 



Size Pole Size. Thickness. Finished Length. 



28 by 3 \:s inches 0.072-inch 77 inches 



29 by 3:i 2H inches 0.090-inch 78 inches 



30 by 3;i 2;i inches 0.090-inch 81 inches 



31 by 4 2!i inches 0.09S-inch 82 inches 



33 by 4 2'i inches 0.110-inch 89 inches 



35 by 5 3 inches 0.135-inch 92 inches 



36 by 6 3!^ inches 0.180-inch 92 inches 



38 by 7 4'A inches 0.210-inch 94 inches 



40 by 8 5 inches 0.250-inch 96 inches 



(b) In case tube is mold-cured, measurements must he equivalent to 

 above as determined by volume. If larger-sized poles are used volume of 

 rubber shall be at least equal to above measurements. 



4. Splice. The splice shall be as strong) as the rest of the tube under 

 the inflation test. 



5. Valves. Each tube shall be fitted with one complet* Schrader valve, 

 or its approved equal, applied in such a manner as not to leak or tear out 

 under ordinary usage. The following schedule shall apply: 



28 by 3 Schrader's No. 1936 



29 by 3'A Schrader's No. 1936 



30 by 3!5 Schrader's No. 725 



31 by 4 Schrader's No. 725 

 33 by 4 Schrader's No. 725 



35 by 5 Schrader's No. 792 



36 by 6 Schrader's No 2033 

 38 by 7 Schrader's No. 2033 

 ■to by 8 Schrader's No. 2033 



Each valve shall be fitted with lock nut. rim nut and valve cap. Dust 

 cap shall be furnished for all valves with the exception of 28 bv 3, 29 by 

 }•/!. 36 by 6 and over. Spreaders shall be furnished for all sizes up to 

 and including 35 by 5. "^ 



6. Marking. Tubes shall be plainly marked with the manufacturer's 

 name and size of tube, in both inch and the metric equivalent in accord- 

 ance with S. A. E. standards. 



7. Tests and Inspection, (al Chemical and physical tests shall be 

 made from each lot of one thousand tubes or less in order to secure de- 

 liveries o. uniform qiiality, and in accordance with the requirements of 

 these specifications. These tests and analyses shall be made in accordance 

 with the procedure followed by the Bureau of Standards, Washington, D. C. 

 Ihe average results of four test pieces cut longitudinally from the tube 

 shall rhovv an ultimate elongation of not less than 750 per cent (1 to 8A 

 inches! when stretched at the rate of 20 inches per minute. The thickness 

 of test puces shall be the full thickness of the tube, and the central portion 

 °.L X^""- '""T ?"*" *>,' M-inch wide over gage length of one inch, the 

 ends being gradually enlarged to a width of approximately one inch to 

 provide a satisfactory gripping surface. The permanent set determined by 

 tlie average of four tests with pieces as above, shall not exceed 10 per cent 

 alter an elongation of 500 per cent (1 to 6 inches) for 10 minutes fol- 

 i>eT:ln'"65 and' 90 Je'^grT^rF"' ^" '"'= ="="' "^ "^"^ ^' ^ temperature 



(b) Each tube shall be tested for leaks by inflating with air and im- 



(c) The Government reserves the right to make any inspection, test or 

 s"ecffi'cati"n""^''^ '° insure the product meeting all requirements of the 



8. Packing. Packing shall be as per specifications accompanying request 



AUTOMOBILE TIRE ACCESSORIES. 



Specification No. 1073A. 

 November 1, 1918. 



1. Blow-Out P.mches. Thei-e are recommended only for emergency 

 repairs. A vulcanized repair should be made as soon as possible. 



Patches must be made of at least six plies of seven-ounce fabric or its 

 equivalent weight of fabric, as approved by the Government. The plies 

 m.ust be properly stepped down, according to good commercial practice. 

 Two ears are required on all patches. The lenijth of the patch must be 

 according to the manufacturers' standard commercial practice. The 3 and 

 3H-inch must be designed for use with clincher fabric tires and the 4, 

 4'A. and 5-iflch must be of ample size for use with cord tires. 



2. Cementless Patches. There shall be one standard size, I'A inches 

 in diameter. The gage and compound of the stock must comply with the 

 specific.ntion for cured-back tube stock as given in the repair material 

 specification. Patches molded to a feather edge are preferred. 



3. Reliners. These are recommended only in case of extreme neces- 

 sity. All sizes up to 4 inches must be made of at least three plies, while 

 4-inch and larger must be made of at least four plies of seven-ounce fabric, 

 or its equivalent, as approved by the Government. The plies must be 

 built up on the bias and a lap of 'at least 6 inches is required. The edges 



must be properly stepped oflf on the sides and skived on the ends to insure 

 against injury to the tube. Each size reliner must be designed so that its 

 Width will be such as to properly fit the standard tire of that size. This 

 includes 3 and 3V^-inch in fabric clincher and 4-inch or larger in cord 

 tires. The edge must stop approximately J^-inch above the toe of the bead. 



4. Flaps. Motorcycle flaps must be of the cemented-in type and equal 

 in construction and quality to the flap supplied by the bidder on tires made 

 to government specifications. 



Straight side cord tire flaps must be of the floating type and equal in 

 construction and quality to the flap supplied by the bidder on tires made to 

 government specifications. 



5. Fabric Cord Patches. These patches must be made accorditig to the 

 manufacturers' standard practice from carded Egyptian, combed peeler 

 cotton fabric, or their physical equivalent, as approved by the Government, 

 weighing not less than 13 ounces nor more than 16 ounces per square yard. 



The plies must be laid on the bias, fictioncd or spread and skim-coated 

 on both sides equally to a minimum gage of 0.043-iiich. The compound 

 must fill the specifications set forth in the repair material specifications cov- 

 ering friction, skim, cushion and tube stocks. 



All sizes up to six-inch shall be four plies and six-inch and above shall 

 be six plies. The patch must be properly stepped down and preference 

 will be given to gum stripped ends to insure against itljury to the tube. 

 There shall be applied in the center of the back of the patch a padding of 

 not less than 1/16-inch thick. The minimum length and breadth of the 

 padding shall not be less than the length of pad specified below. 



The following sizes are standard and lengths required are given in table: 



3!^ and 4-inch patch — length 10 inches. Length of pad 4 inches. 



A'A and 5-inch patch— length 11 inches. Length of pad 5 inches. 



6-inch patch — length 12 inches. Length of pad 6 inches. 



7-inch patch — length 13 inches. Length of pad 7 inches. 



8-inch patch — length 14 inches. Length of pad 8 inches. 



6. Valve Accessories, (a) Valves: 



Schrader's 1936 or approved equivalent for motorcycle tubes. 

 Schrader's 725 or approved equivalent for 3}^ and 4-inch auto 



lubes. 

 Schrader's 792 or approved equivalent for Ayi ^"d 5-inch auto 



tubes. 

 Schrader's 2033 or approved equivalent for 6inch tubes »nd 



(b) V'alve caps: Schrader's 880 or approved equivalent. 



(c) Valve insides: Schrader's 1801 or approved equivalent. 



(d) 'TiTe gage: Schrader's straight Universal gage or approved equiva- 

 lent for small cars and motorcycles. 



Schrader's right-angle gage or approved equivalent for large cars and 

 pneumatic-tired trucks. 



(e) Pump connection: Schrader's Universal No. 2238 or approved 



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



(g) \'alve repair tool: Schrader's No. 2395 or approved equivalent. 

 "The power to approve equivalents is vested only in the Government. 



7. Repair Kits. Repair kits shall be made up with the following ma- 

 terial:— packed in a round cardboard carton with tin ends and cover, 

 approximately 2'A inches in diameter and 2'A inches deep. 



It shall contain: — 



6 standard cementless patches. Refer to Specification No. 1073A— 2. 

 Strip of cured-back tube gum 2 by 8 inches. 

 Tube of cement 2^ by J^ inches in diameter or equivalent. 

 Piece of sandpaper 2 by 8 inches or equivalent. 

 2 valve insides. Schrader's 1801 or approved equivalent. 

 2 valve caps. Schrader's 880 or approved equivalent. 

 Carton to be labeled as follows: 



Directions 

 For Temporary Tube Repairs, 

 For repairing small punctures use "Cement- 

 less Patches." Roughen the tube with sand- 

 paper, then apply cement and allow to dry. 

 Remove cloth from patch and apply. Tube 

 can be used at once. 



For repairing blow-outs use combination 

 repair stock. Roughen tube around cut with 

 sandpaper, then apply " 



cut 



^ide 



around 



de of tube. Allow to dry. 

 stock M-inch larger in 



U. S. ARMY STANDARD Cut I 



INNER TUBE all dimensions than cut and plac 



REPAIR KIT. tube, bringing edges of cut together over cen- 



ter of stock. Applv 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. 

 Specification No. 1Q67A. 



Novemter 1, 1918. 



Fabric. This fabric shall be I7'4 nnnces per iqiiarc yard with an allow- 

 able variation of 3 per cent plus or minus. It shall be 23 by 23 weave. 

 The fabric shall be made from lonp-staple cotton with a tensile strength 

 for both wrrp and filler of at least ISO pounds per inch._ Methods_of 

 as specified in the fabric 



and skii 



This fabric shall be made from long-staple 

 leeler cotton, or their physical equivalent 

 weighing 



be the 

 shall be frictioned b^ 

 of 0.047-ineh. 



(b) Cord Builder Fabr; 

 carded Egyptian or combe , ... 

 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, 



(c) 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. 



(d) Breaker Fabric. This breaker shall be an open-weave fabric of at 

 lea,st 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. 



2. Compounds— Only Three Stocks Necessary. (a) Friction, skim, 

 cushion and tube repair stock. Specific gravity not to be over 1.30. These 



