MG-30 and MG-49 are modified, high performance, specialty natural rubbers prepared by graft polymerization of poly methyl methacrylate (PMMA) into a natural rubber latex. The number in the name denotes the percent of PMMA graphed to the elastomer; thus MG-49 has 49% PMMA and 51% natural rubber. The PMMA imparts stiffening and hardening characteristics to rubber compounds. An important use of MG-30 and MG-49 are in solution adhesives especially pressure-sensitive adhesives for bonding dissimilar materials. Adhesive compounders utilize these specialty elastomers in various different tape compounds including: PVC electrical insulation, paper craft, masking, protective and surgical tapes. NR/NBR blends benefit from the compatiblizing nature of the dual polarity in MG products. The plastic-like nature of the methyl methacrylate lends itself to preparation of high hardness/modulus, good physical properties, impact resistant, easy-processing rubber compounds. MG-30 and MG-49 can be blended with natural rubbers for intermediate durometers. It is cured essentially like conventional natural rubber. The viscosity and scorch properties are excellent compared to a highly loaded black compound. MG-30 and MG-49 are stiff and non-tacky at room temperature. Their thermoplastic nature allows good processing (calendaring and extruding) high durometer stocks.