Pressure-sensitive adhesive compositions

A surgical pressure-sensitive adhesive product comprising a flexible backing having a pressure-sensitive adhesive composition coated on at least one side thereof, said pressure-sensitive adhesive composition comprising from about 30% to about 50% of an elastomeric mixture consisting of natural rubber and polyisobutylene wherein the polyisobutylene has a molecular weight range of from about 64,000 to about 99,000, from about 5% to about 20% by weighting of the total composition of a liquid plasticizer component, and from about 30% to about 50% by weight of the total composition of a solid tackifier component having a softening point of from about 100.degree. C. to about 125.degree. C., wherein the elastomeric mixture of natural rubber and polyisobutylene is in a ratio of from about 1:1 to about 3:1 and the pressure-sensitive adhesive composition has a Williams plasticity of from about 1.5 mm to about 2.4 mm.