II 4 PARA RUBBER. 



Federated Engineering Company, Ltd., Kuala Lumpur, Selangor, 

 under the name of the " K.L." Coagulator shown in Fig. 21. 

 The subjoined instructions are given for manipulating it : 



"The following solution of acetic acid has been found to give good 

 results for coagulation : 



6 of water to i of glacial acetic, and 



1 1 fluid oz. of the solution to every 4 gallons of latex. 



" Having strained the latex into the coagulator, turn the handle slowly 

 while pouring in the solution ; the latter should be poured in slowly, so as 

 to be as widely diffused as possible throughout the latex. 



" The solution having all been poured in, continue to turn for about five 

 minutes ; a medium pace should be maintained, and the handle occasionally 

 reversed for a turn or two. 



"Supposing there to be about 35 gallons of latex in the coagulator, it will 

 be noticed that coagulation starts in about five minutes, and when once this 

 is the case, it will be found best to let it stand, and then turn again in 

 alternate spells of short duration. Quantities of 30 to 50 gallons of latex 

 may be coagulated in about six or seven minutes." 



The inventor asserts that "by the use of this machine all 

 decomposition of the proteids contained in the latex is rendered 

 impossible, and when the coagulated rubber is washed through 

 a machine, there is an entire absence of that unpleasant odour 

 so associated with new rubber which has been coagulated in 

 pans." 



CREPE AND WASHED RUBBER. 



The manufacture of crepe rubber, briefly described, consists 

 in passing the freshly coagulated rubber through a washing 

 machine ; although scrap rubber may also be turned into this 

 form. 



Planters have adopted a method somewhat similar to one 

 of the processes employed by manufacturers in treating wild 

 rubber. The principal advantages claimed for it are, that it 

 dispenses with a large amount of the labour involved in the 

 preparation of biscuit rubber ; the latex may be coagulated in 

 bulk, and the coagulum cut up into lumps and passed direct into 

 the machine. Mechanical impurities and some of the substances 

 which encourage putrefaction are expelled. The rubber is turned 

 out in sheets with an irregular surface, thereby effecting a saving 



