186 



THE INDIA RUBBER WORLD 



[January 1, 1919. 



TIr- r.overiinicnt may appoint 

 arc complied with, 

 (c) ■ A bidder must s'lpprv an afRd.avit before delivering any casings to 

 the Government, stntine that the casings lo be delivered are the same 

 cross-soctiop .nn.l ,,r:utirallv duplicate, in construction and material, casings 

 vhich In 1' in> I ^ tested in accordance with paragraphs (a) and 

 icr of casings satisfactory to the Government, 

 aged on the rear wheels at least 4,000 miles, 

 of each casing shall be properly lined in ac- 



(b),. 



cordancc v.iiu ■.: i .'..: l.i'.I pnicticc of the 



7. ViM'i. No ll.il'^ shall he supplied. 



8. CovrouNDs. fa) Tread. — The tread shall be made from and have 

 the characteristics of a compound containing at least 65 per cent by 

 volume of the best quality new wild or plantation rubber. Compound 

 shall be free from ingredients kn.n.i. i.. t)>,. rubber trade as oil substi- 

 tutes. The minimum tensile strcni;il> H lu . -ii |„,unds per square inch 



of 450 1 11 inches) as determined 



ii the rate of 20 inches 



M.illy and shall be ^-inch 



\Vde over a qage length of two iialu-. liu tiuh, being gradually enlarged 



with a minimum elongati< 



after elonqation of 400 per cent (2 to 10 inches) for ten 

 minutes follov/ed by a rest "f ten unnutos. All tests shall be made at a 

 temperature between 65 .i-i ' "" ' ■'■ '■' 



(b) Friction and Cu-1 i " be made from and have the 

 characteristics of a conii ' it least 75 per cent by volume 

 of the best quality new n rubber. The compound shall 

 be iu". of ingredients k,, i tia.U- as oil substitutes and/or 

 reclaimed rubber. 



(c) Si.l^wall— The "..I ! .11 mid have the charac- 



of thc^hcstqualitv iiev i i i .i Reclaimed rubber to 



the fxttnt "t" 1? |nr k-m ' • ill,!.' .imd is allowed, but the 



■■:::■ ' ' ' M-' i . -' 1 ' 1 ' ' i • . i . . ■■ , ttircr. Compouud shall 



ments of this specification. 



10. Wrapping and Marki 

 cordinij to standard practice 

 the size and type, and nam 

 and year of manufacture st; 

 place. 



11. Packing. Packing shall be as per specifications accompanying thi 



PNEUMATIC AUTOMOBILE CASINGS (RIBBED OR NON-SKID) 



Size 33 by 4 inches. 



EngiiK 



. 2 1 



the discretion of the inspector. , „ , -, n^r. j ti.-. 



(c) The minimum strength of the casing shall be 2,000 pounds. This 

 "suength factor" is the product of the number of cords per inch measured 

 at the tread at right angles to the cords multiplied by the strength of the 

 individual cord as taken from the cord tire multiplied by the number of 



(d) The strength of the union between breaker and tread and between 

 breaker .ru.l cll^hi•>n shall be not less than 32 pounds per inch, using the 

 star hi friction test as provided in paragraph No. 4, fabric 



inas must guarantee them to be free from 

 marked with manufacturer's name, aerial 



ce with this spccifica- 

 in-skid or ribbed (as 

 ard S. A. E. straight 

 size 33 by 4 inches. 



(f) Slr-HKlh of the 

 pounds or more per inc 

 ;.hove provided. 



5. Road Ti-st. Manufactur 



"Ta')"'ra~M'' "';"'"«,""";,' 



Ihc bid !■ 



requirements 



.' ; submitting 



■ .A and will 



1 wurk, and 



:i . <TMi material, casings 



ir : ,,,aphs (a) and (b). 



I, 1 . ::m < , .\ ernment, not less 



' 1' i iM|,rily lined in accord- 



■Aitli e.Tch easing, as in standard 



ad shall be made from and have 

 rg at least 70 per cent by volume 

 ,n rnlib.i. Tlip minimum tensile 



II. ,1 . 'i -.nil a minimum elonga- 



I. i t»y the average of 



I ■ 1 ' ■ s per minute. The 



-;.. I;;all> enlarged lo a width 



! .1 'ieterinincd by the average 



1 ii.it exceed 25 per cent after 



i. I for len minutes, followed 



- i,;ll lie made at a temperature 



all be made from and have the 

 ■ at least 85 per cent by volume 

 rubber. 



made from and have the charac- 

 mum of 65 per cent by volume of 

 ■ubber. The compound shall have 

 lIs per square inch and a minimum 

 esl. The permanent set shall not 



:ified 



iings. 



showing 



'lie size 1 I : r. ,. A label with the month 



and year m ,...,: ,,,, .; .; ,|| ]-c pasted in a conspicuous 



11. Pairing. Pjieking shall tie as per specifications accompanying the 

 request for bul. 



PNEUMATIC AUTOMOBILE CASINGS (RIBBED OR NON-SKID). 



Size 35 by 5 inches. 



CORD CONSTRUCTION. 

 Specification No. 1059A. 



1. Generai., fa) Pneumatic automobile casings manufactured in ac- 

 cordance wilh this specification shall be of cord construction, of the size 

 known to the. trade as 35 by 5 inches. 



il.i I .e.iiiLs must be designed to carry a load of 1,500 pounds when 



I. Hirer of casings must guarantee them to be free from 



f the casing. Each chafing 

 strip shall evtend upward on the =ic)e nf the casing at least one inch 

 frjm the heel of the bead One eliahni; stiip ahall extend at least 3/16-inch 

 abo\c the other 



(f) There sha'l be a cush'On of rubber compound applied over the 

 cords which shall be wider than the breaker. The minimbm gage of this 

 cushion shall be 0.0.50-inch. 



(g) Over the cushion there shall be at least one breaker strip of open- 

 weave fabric such as is used in standard commercial practice, coated on 

 both sides with a rubber compound having the physical and chemical 

 properties of a nature to .form a perfect union between the cushion and 

 tread when the cure is eiTected. This breaker strip shall have a minimum 

 width of 2^ inches. Preaker shall be made from long-staple Egyptian 

 cotton or its physical equivalent as approved by the Government and shall 



(h) The tread of the casing shall not be less than -l-g-inch thick in the 

 center, ^^-inch of which shall be the minimum thickness for that part of 

 the tread under the middle of the non-skid portion, 

 casing shall have a n 



all of th( 

 0.0625-inch. 



4. Physical Measureme 

 of each lire inflated acco 

 schedule of the S. A. K. sh 



thickr 



Test 



:s manufactured in accordance with this specification 

 'irtiirer's standard non-skid or ribbed (as ordered) 

 iM .1 for the standard S. A. E. straight side rim of 



.' Carcass of casing shall consist of not less than 



. [.arate plies of cord applied in such a manner that 



lie^ shall run in each diagonal direction across the 



(c) All cord fabric must b 

 manufacturing practice before 

 rubberizing. 



(d) The usual methods of inspection used by tire coniprinies in com- 

 mercial practice to discover detects in each roll of cord fabric shall be 

 employed, and tests to determine tensile strength of cords shall be made 

 on ten individual cords taken from each roll. The results shown must be 

 up to the standard specification of the individual manufacturer. 



(e) Two chafing strips of fabric weighing not less than eight ounces per 

 yard, shall be used on each side of the casing. Each chafing strip 



in 



xtend 



the side of the 



leas 



inches from the 



