( 30 ) 
Future It is not possible to forecast any 
Possibilities radical changes in the types of “ first 
of Manu- latex ” rubber which may be marketed 
facture. generally in the immediate or more 
distant future. The value of “ slab " 
rubber, on account of its specially rapid vulcanising 
qualities combined with its general superiority as 
compared with the sheet and crepe, is possibly dis- 
counted to a great extent by the remarkable increase 
and extended use of numerous organic vulcanization 
accelerators now on the market. 
It has, however, been stated by competent authori- 
ties that this increased use of accelerators, and 
particularly the exceedingly powerful types now 
being evolved, is not altogether without disadvan- 
tages to the manufacturer; in consequence of which 
the production of naturally fast vulcanizing uniform 
rubber would be well received in the manufacturing 
industry. Supporting this there is a knowledge of 
large contracts by a certain progressive Company 
which were maintained throughout 1923 for a 
guaranteed type of rubber which vulcanised in an 
ordinary 9:1 rubber-sulphur mix at 4 times the 
rate of 1st latex standard crepe and gave a superior 
vulcanised product. The consumers paid a higher 
price for the commodity than the ruling rates for 
standard crepe and the vending Company’s produc- 
tion costs were lower than they would have been 
if their product had been in the ordinary form. 
In addition to this it has now been proved that, 
by careful collaboration of the engineer and the 
chemist, and by the utilisation of existant plant 
only, a fast vulcanising, improved type of raw 
rubber can be produced in crepe form which also 
possesses the superficial qualities of standard 1st 
