January 



THE INDIA RUBBER WORLD 





The 



ast 3/16-iach above 



um gage of ' 



the 



weave fabri 

 both sides 

 properties o 



width of 3\ 



cotton or its physical eqi 



weigh not less than ten 



(h) The tread of the 

 the center, 3/16-itich of 

 part of th. 



used 



be 



least 



i) The 



0.0625-1 



4. F 



of eacl 



schedul 



(b) 



tire 



Measur 

 nflated : 



reaker strip of open- 

 I practice, coated on 

 :r compound having the physical and chemical 

 i form a perfect union between the cushion and 

 [fected. This breaker strip shall have a minimum 

 reaker shall be made from long-staple Egyptian 

 ivalent as approved by the Government and shall 

 nmces per square yard. 



casing shall not be less than 7/16-inch thick in 

 which shall be the minimum thickness for that 

 he middle of the non-skid portion. 



;ing 





Tests, (a 



ended 



of the S. A. E. shall be not less than 5.- 

 ires shall be capable of withstanding watei 

 e inch without apparent injury. This te 

 discretion of the inspector. 



(c) The minimum strength of the cas 

 "strength factor" is the product of the nu 

 at the tread at right angles to the cords, 

 individual cord as taken from the cord c 

 of plies. 



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

 breaker and cushion shall be not less than 32 pounds per inch, using the 

 standard dead weight friction test as provided in paragraph No. 4, fabric 



ig shall be 2,500 pounds, 

 iber of cords per inch me 

 lultiplied by the strength 

 ising, multiplied by the i 





casing specihcations. 

 (e) Strength of the 



above provided. 



betvve 



(f) 



the 



pounds or more per inch, using the standard dead weight f 

 above provided. 



5. Road Test. Manufacturers bidding on government requ 

 meet the following conditions: 



(a) Casings will not be given consideration u 

 the bid furnishes an affidavit stating that he 

 continue to maintain at least two cars used e.xcl 

 that tliese c.irs average at least 1,000 car miles 



(b) The speeds, loads, tire sizes, inflations 

 be such that the casings are properly tested. Th 



nspector to see that the above condit' 



(c) A bidder 



laintained 

 for test V 



nplied with. 



litting 



Gov 

 wWch" 



tha 



the 



dupli^ 



statini 



previously tested in accordance with parag 

 sufficient number of casings satisfactory to the Gove 

 than six, have averaged on the rear wheels at least 5,000 



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

 ance with the standard practice of tire manufacturers. 



7. Flaps. A flap shall be furnished with each casing, 



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

 the characteristics of a compound containing at least 70 per cent by volume 

 of the best quality new wild or plantation rubber. The 

 strength shall be 2,400 pounds to th ' ' -'- " 



tion of 500 per cent (2 



standard 



ched 



be 



(b) Friction and 



cf the best quality ne 



(c) Sidewall.— The 

 teristics of a compou 

 of the best quality n 



12 inches) as determined by thi 

 the rate of 20 inches per r 

 lally and shall be f4-inch v 

 ids being gradually enlarge 



shall 



nimum elonga- 

 verage of four 

 lUte. The test 

 h wide over a gage 

 .rged to a width of 

 d by the average of 

 not exceed 25 per cent after 

 es) for ten minutes, followed 



All 



shall 



shall 

 (d) 



im elongatu 



All above 

 The above 



Cushion.— These 



V wild or plantat 



sidewall shall b 



id containing a 



lie slren^h o/"' 

 f 450 per cent C 

 aximum of 25 p. 



on rubber. 



» made from and have the charac- 

 ninimum of 65 per cent by volume 

 ation rubber. The compound shall 

 ,500 pounds per square itich and a 

 to 11 inches). The permanent set 

 r cent, tested as specified in 8(a). 



free of 

 -rve's the 



ings. 



edients kn 



to the 



casings shall be spirally wrapped 

 perly labeled on the outside showing 

 ifacturer. A label with the month 

 it shall be pasted iii a conspicuous 



request for bid. 



PNEUMATIC AUTOMOBILE CASINGS (RIBBED OR NON-SKID). 



per sou 



s must guarantee them to be free from 

 frked with manufacturer's name, serial 



shall be of the man 

 straight side type de 

 the size 36 by 6 inch 



(c) All cord fabr 

 manufacturing practie 

 rubberizing. 



employed, and tests to 

 ten individual cords i 

 up to the standard spi 

 (e) Two chafing sti 

 square yard shall be i 

 shall extend upward 

 heel of the bead. 



red in accordance 

 ndard non-skid or 

 standard S. A. E. 



n inspection used by 

 defects in each roll . 



from "ach*" roll!"^TYe 

 ion of the individual n 

 fabric weighing not le; 

 n each side of the casi 



ith this specification 

 ribbed (as ordered) 

 straight side rim of 



One 



of the 



shall be 



the 



(f) Th 

 which shall be wider tha: 

 shall be 0.080-inch. 



(g) Over the cushion 



shall 



The 



;ord fabric shall be 

 ds shall be made on 

 alts show^n must be 

 .ifacturer. 



lian eight ounces per 

 "^ ■ afing strip 



the 



shall be at least one breaker strip of open- 

 such as is used in standard commercial practice, coated on 

 both sides with a rubber compound having the physical and chemical prop- 

 erties of a nature to form a perfect union between the cushion and tread 

 is effected. This breaker stri^) shall have a minimum width 

 Breaker shall be made from long-staple Egyptian cotton or 

 physical equivalent as approved by the Government and shall weigh not 



yard. 

 (h) The tread of the casing shall not be less than 9/16-inch thick in 

 Iter, 7/32inch of which shall be the minimum thickness for that part 

 tread under the middle of the non-skid portion. 

 The sidewall of the casing sliall have a minimum thickness of 



when the 



of. the 



(i) 

 0.0625-i 



Me 



Tests 



of each tire inflated according to the r 

 of the S. A. E. shall be not less than 

 (h) Tires shall be capable of withs 

 per square inch without apparent inj 

 discretion of the inspector. 



(c) The minimum strength of the 

 "strength factor" is the product of th 

 at the tread at right angles to the co 

 individual cord as taken from the ci 

 of plies. 



(d) The strength of the union bet 

 breaker and cushion shall be not less 

 standard dead weight friction test as 



sing shall be 3,000 pounds. This 

 umber of cords per inch measured 

 multiplied by the strength of the 

 casing, multiplied by the number 



:n breaker and tread and between 

 an 32 pounds per inch, using the 

 ovided in paragraph No. 4, fabric 



iing the 



(e) Strength of the m 

 pounds or more per inch, 

 above provided. 



(f> Strength of the ui 

 pounds or more per irich, 

 above provided. 



5. Road Test. Manufacturers bid 

 meet the following conditions: 



(a) Casings will not be given con 

 the bid furnishes an affidavit stati 

 continue to maintain at least two ca 

 that these cars average at least 500 



(h) The speeds, loads (which ma 

 tions and road conditions must be sip 

 The Government may appoitit 

 are complied with. 



(c) A bidder must supply 

 the Government, stating that t 

 section and practically duplicat 

 he has previ'ously tested in accordance 

 sufficient number of casings satisfactor 

 four, have averaged on the rear wheel: 



gov 



requ 



inspect, 

 affidavi 



deration unless the maker subi 

 ; that he has mailitained an 



used exclusively for test wor 

 ar miles per car per week, 

 be of merchandise), tire sizes, 



that the casings are properly 

 that the above con: 



The 



,ide of 



with the standard practii 

 Flaps. A flap shall be furnished with eac 

 nercial practi- 



read.— Th, 

 the characteristics of a comiiouiul coi 

 of the best quality new wild or pla 

 strength shall be 2.400 pounds to thi 

 tion of 500 per cent (2 to 12 inchesl 

 test pieces when stretched at the ra 

 pieces shall be cut longitudinally ai 

 length of two inches, the ends bei 

 approxim.ntrlv tt^t i'll.-h The p'^rnrt: 



Standard 

 and have 

 m ^tensHe 

 r o^f°"o^ur 



least S5 per cent by volume 

 l.ber. 

 from and have the character- 



claimed rubber. 



ves the right to make any insnec- 

 the product meeting all require- 



ided by the Society of At 



A label with the month and 



