184 



THE INDIA RUBBER WORLD 



[January 1, 1919. 



to the rubber 



i);.ll be 2,200 p 



50 per cent (2 to 11 



tread shall 

 lining at least 65 pe 

 rubber. Com] 



per 



inches), a- 



„ n stretched at the rate it 



test pieces shall be cut longitudinally and shall 

 length of two inches, the ends being gradna 

 approxim.itely one inch. The permanent Fit 

 of four tests with the test pieces as above si 

 after an elongation of 400 per 

 lowed by 



,_ - by volume of 



nd shall be free from 



minimum 



:5 per 



ches) for ten minutes fol- 

 shall be made at a temperature 

 between 65 and 90 degrees K. 



(b) Friction and Cushion. — These shall be made from and have the 

 characteristics of a compound containing at least 75 per cent by '■oinmt 

 of the best quality new wild or plantation rubber. The compound shall 

 be free of ingredients known to the rubber trade as oil substitutes and/or 

 reclaimed rubber. 



(c) Sidewall. — The sidewall shall be made from and have the character- 

 istics of a coiTipoiind containing a minimum of 65 per cent by volume of 

 the best qualitv new wild or plantation rubber. Reclaimed rubber to the 

 extent of 15 per cent by weight of total compound is allowed, but the 

 amount and kind must be declared by the manufacturer. Compound shall 

 have a minimum tensile strength of 1,500 pounds per square inch and a 

 minimum elongation of 450 per cent (2 to U inches) and a inaximum set 

 of 25 per cent, tested as specified in 8(a). The compound shall be free of 

 ingredients known to the rubber trade as oil substitutes. 



(d) All test pieces must be cut from casings. 



9. Inspection. The Government reserves the right to make any inspec- 

 tion, test or analysis necessary to insure the product meeting all require- 

 ments of this specification. 



10 Wr/.pping and Marking. All casings shall be spirally wrapped ac- 

 cording to standard practice and properly labeled on the outside showing 

 the size and type, and name of manufacturer. A label with the month 

 and year of manufacture stamped on it shall be pasted in a conspicuous 



Packing. Packing shall be as per specifications accompanying the 

 t for bid. 

 PNEUMATIC MOTORCYCLE CASINGS (NON-SKID). 

 Size 29 by 3^4 inches. 



FABRIC CONSTRUCTION. 

 Specification No. 1065A. 



(a) Pneii 



NovE^ 



1918. 



cvHe 



nufac 



shall be of fabn'c 



-ade as 29 by 3^ incl 

 must be designed to 

 inds per square inch, 

 lufactiirers of casings 



iible 



a load of 400 pounds when 

 guarantee them to be free fr 



the equivalent metric sizes as 



2. Type. All casings manufactured in accordance with this specification 

 shall be of the manufacturer's standard non-skid clincher type, designed for 

 the S. A. E. clincher motorcycle CC rim of the size 28 by 3 inches. 



3. Construction, (a) Splices on the first ply of fabric shall be gum- 

 stripped. 



(b) Carcass of casing shall consist of four separate plies of tire fabric, 

 with friction coat on two sides and skim coat on one side. The sage of one 

 plv frictioned on two sides and skim-coated on one shall be at least 

 0.643-inch. Each ply shall have n'.t more than two splices which must be 

 at lea't seven inches apart measured on the circumference of the casing. 

 The splices in the casing shall be at least three inches apart when measured 



woven (23 by 23) from Eg>'pti; 

 valent as approved by the Govi 

 : yard with an allowable variance 



long- 



(c) All fabric must be squar( 

 staple cotton or its physical equ 

 weighing 17;4 ounces to the squai 



(d) .'\1I fabric must be thoroughly dried according to standard manu- 

 facturing practice before it is started through the operations of rubberizing. 



(e) The usual methods of inspection used by tire companies m coin- 

 mercial practice to discover defects in each roll of fabric shall be employed. 

 All fabric shall be tested in an approved testing machine to determine the 

 tensile strength in the following manner: the distance betw-een the grips 

 on the machine shall be approximately three inches, and the separation 

 of the jaws shall be at the rate of 20 inches per mitiute. Six samples shall 

 be cut from each roll in such a manner as to eliminate any unnecessary 

 waste of material. Three samples shall be cut longitudinally to determine 

 the warp strength and three samples shall be cut transversely to determine 

 the filler strength. The samples shall be prepared in the following manner: 

 unravel to 23 yarns (1-inch width); fabric shall be dried one hour ana 

 thirty minutes at 110 degrees C. Breaking test shall be completed within 

 thirtv seconds of time of removing test strip from oven. 1 he results 

 must' show a tensile strength of not less than 165 pounds per inch width 

 for either warp or filler. . , , 



(t) Beads shall be constructed with a core filler as in standard com- 





fabric weighing not less than 8 

 1 each side of the casing. The 

 iide of the casing at least ii-mcb 



ounces per square yard shall be used 

 chafiing strip shall extend upward on the 

 from the channel of the bead. ... ^ ,• j ... .i,. f,l„-,v 



(h) There shall be a cushion of rubber compound applied over the tabric 

 which shall be wider than the breaker. The minimum gage of this - 

 shall be 0.045-inch. , v i * ■„ 



(i) Over the cushion there shall be at least one breaker strip 

 weave fabric such as is used iii standard commercial practp 

 both sides with a rubber compound having the physical and r ■ 

 ties of a nature to form a perfect union between th " ' 

 when the cure is efltected. This breaker strip shall ha 

 ot ZVi inches. Breaker shall be made from long-staple 

 less than 8 ounces per square yard. 



(j) The tread of the casrtg shall not be 1 

 center, '/^-inch of which shall be the minimur 

 tread under the middle oi Jhs jjofl-skid portio 



cushio 





lical proper- 



of the 



thickness of 0.050- 



4. PiivsicAi. Measurements and Tests, (a) Cross-sectional diameter 

 of each tire inflated according to the recommended weight and load schedule 

 of the S. A. E. shall not be less than 3-7/16 inches. 



(b) Tires shall be capable of withstanding water pressure of 275 pounds 

 per square inch without apparent injury. This test is to be made at the 

 discretion of the inspector. , , , . u ,, ,^ 



(c) The strength of the union between plies of fabric shall average 16 

 pounds or more per inch, usi'ng the standard friction test, viz. : a section 

 of the casing is to be cut one inch in width measured ClrcumferentIaUs^ 

 The plies are to be started and pulled down two inches at one bead, which 

 bead is to be clamped in the jaws of standard friction testing machine 

 The test shall be made on any ply of fabric in accordance with the standard 

 dead weight friction test. The rate of separation shall not be more than 

 one inch per minute. 



(d) Strength of the union between the breaker and tread and between 

 the breaker and cushion shall be not less than 28 pounds per inch, using 

 the standard dead weight friction test as above provided. . „ . 



(e) Strength of the union between cushion and carcass shall.be not 

 less than 16 pounds per inch, usiiig the standard dead weight friction test 

 as above provided. .... , ,, i_ .. i 



(f) Strength of union between sidewall and carcass shall be not less 

 than 10 pounds per inch, using the standard dead weight friction test as 



5!'^ Road' Te.st. Manufacturers bidding on government requirements 

 must meet the following conditions: 



(a) Casings will not be given cor 

 mitting the bid furnishes an aflSdavit stat 



unless 





id that thi; 



maker sub- 



ed and will 



dusively for test work, 

 miles per 



1 .000 



™ and 

 less 



inside of the 



(b) The speeds, loads, tire sizes, inflations and road conditions must 

 be such that the casings are properly tested. The Government may appoint 

 an inspector to see that the above conditions are complied with. 



(c) \ bidder must supply an affidavit before delivering any casings to 

 the Government, stating that the casings to be delivered ; 

 section and practically duplicate, in construction and material, oasings 

 he has previously tested in accordance with paragraphs (a) and (b) 

 a sufficient num'ber of casings satisfactory to the Government, nol 

 than siic, have averaged on the rear wheels at least 4,000 miles, 



6. Lining. The inside of each casing shall be properly lined 1 

 cordance with the standard practice of the tire manufac' 



7. FlAPS. Each casing shall have a flap cemented 

 casing in accordance- with standard commercial practice. 



8 Compounds, (a) Tread.— The tread shall be made from and have 

 the characteristics of a compound containing at least 6S per cent by volume 

 of the best quality new wild or plantation rubber. Compound shall be free 

 from ingredients known to the rubber trade as oil substitutes. The mini- 

 mum tensile strength shall be 2,200 pounds per square inch ^ylth a mini- 

 mum elongation of 450 per cent (2 to 11 mches), as deterniined by the 

 verage of four test pieces when stretched - *•'» "'- "f "f* '"''h'-s n" 



raduallv enlarged 



et determined by 



shall not exceed 



ches) for ten 



The test pieces shall 

 wide over a gage length of tw 

 to a width of approximately one inch. Itie pe 

 the average of four tests with the test pi'eces 

 ' ligation of 400 per — ' 



25 per 



followed by 



All tests shall be made 



Fric 



65 



of ten 

 shi'on.— Their diall be made from and have the 

 characteristics of a compound containing at least 75 per cent by volume 

 of the best qua ity new wild or plantation rubber. The compound shall 

 be free of incredients known to the rubber trade as oil substitutes and/or 

 "trlidetafk-The sidewall shall be. made from and have the charac- 



*oYi L-b^I. V^Srn-e ^.eHrSr-^pla^tX™ "r'Shbt." i!^^X^?u^^ 

 rte extent of 15 per cent by weight of total comoound is allowed, but 



le manufacturer. Compound 

 500 pounds per square inch 



11 inches) and a maxiinum 

 The compound shall be free 



1 substitutes. 



shall be 



,„e a.M.u... «.... ....^ ...«-. .-.- declared by 



shall have a minimum tensile strength of 

 and a minimum elongation of 450 per cent (2 

 set of 25 per cent, tested as specified in 8(a) 

 of ingredients known to the rubber trade as ( 

 (d) All test pieces must be cut from casings. 



9. Inspection. The Government reserves the right to mak 

 tiori. test or analysis necessary to insure the product meeting 

 ments of this specification. 



10. Wrapping and Marking- All casu 

 cording to standard practice and properly labeled 

 the size and tvne and name of manufacturer. A 1; 

 year of manufrct'ure stamped on it shall be pasted in a conspicuo, 

 '^?1. PACKING picking shall be as per specifications accompan 

 request for bid. 



PNEUMATIC AUTOMOBILE CASINGS (NON-SKID) 



Size 30 by 314 inches, 

 fabric construction. 



Specification No. 1066A. 

 November 1, 1918. 

 1. General, (a) Pneumatic automobilj 



all require- 



wrapped ac- 

 de, showing 

 ; month and 



jcification shall be of fabrii 

 known to the trade as 30 by 3^2 inches. 



(b) Casings must be designed to carry 

 inflated to 55 pounds per square inch. 



(c) The manufacturers of casings 

 defects in material and workmanship. 



(d) Casings shall be plainly marked with 

 number and size of 



(e) As soon as 

 the equivalent meti 

 Engineers. , . 



2. Type. All casings manufactured in accordance 

 shall be of the manufacturer's standard non-skid cl: 

 for the S. A. E. clincher rim of the size 30 by 3i-'2 



3. Construction, (a) Spl 



(b) Carcass of casing shall 

 five separate pF 



■uction of the size 



load of 570 pounds when 



guarantee them to be free from 



facturer's name, serial 



ated 



shall 



