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1. A commercially feasible method for adding carbon black to latex has been developed and tested. The black-latex mixture can be handled in essentially the same way as normal GR-S throughout the various steps of coagulation, washing, drying and baling. 2. By incorporating black into GR-S latex, an increase in milling capacity of about 35 per cent is possible. 3. The total power required for mixing this black-rubber is at least 20 per cent less than for tread stock mixed in the conventional way. 4. Mixing temperatures are lower for latex-black stocks. 5. Physical properties and preliminary tire tests show that carbon black incorporated with the latex produces stock equivalent in physical properties to stocks prepared by mixing carbon black into dry rubber. 6. Considerable savings are made possible by the use of this method. 7. The amount of dirt now present in the millrooms of the rubber manufacturing plants should be greatly reduced.

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