“…The Firestone Tire & Rubber Company, Akron, Ohio THE successful blending of GR-S and Hevea latices is dependent largely on the compatibility of the stabilizing system characteristic of each type of latex. Thus, the final stability of the blend will be determined by the degree of interaction between either the soap and inorganic salts present in the synthetic system with proteins, or their degradation products, and other ammonium salts which contribute to the stability of natural latex (1,8). For example, it has been known for some time that surface active agents in general (2,15,17) and soaps in particular (7,11) when added to aqueous solutions of proteins will produce marked changes in the physical condition of the protein molecule.…”