Abstract: An improved anti-corrosive material used to protect buried conduits from corrosion. The anti-corrosive material is comprised of a conduit contacting layer of polyolefin having the anti-corrosive agents impregnated therein. The preferred embodiment of the material is a multi-layered co-extruded, calendered, or laminated polyolefin. The material has an outer layer, or environment contacting layer, preferably comprised of a low density polyethylene having characteristically strong tensile strength and elongation properties to provide conventional protection from soil, water, air, or other potentially damaging elements. The material has a center layer preferably comprised of a high density polyethylene having superior tensile strength to provide a high density barrier between the outer layer and an inner layer. The inner layer, or conduit contacting layer, is preferably comprised of a low density polyethylene impregnated with one or more antimicrobial additives.

Abstract: An improved anti-corrosive material used to protect buried conduits from corrosion. The material is a multi-layered co-extruded, calendered, or laminated polyolefin. The material has an outer layer, or environment contacting layer, preferably comprised of a low density polyethylene having characteristically strong tensile strength and elongation properties to provide conventional protection from soil, water, air, or other potentially damaging elements. The material has a center layer preferably comprised of a high density polyethylene having superior tensile strength to provide a high density barrier between the outer layer and an inner layer. The inner layer, or conduit contacting layer, is preferably comprised of a low density polyethylene impregnated with a biocide, a volatile corrosion inhibitor (VCI), or both.

Abstract: An anti-corrosive material used to protect buried conduits from microbiologically-influenced corrosion, or “MIC”. The material preferably comprises a low, medium, or high density polyethylene sleeve having a bactericide impregnated therein such that said bactericide can migrate within the polymer matrix to contact the conduit surface and thereby prevent MIC therein. The material may further comprise a barrier layer of high density polyethylene between the bactericide-containing layer and the environment. The bactericide is able to migrate through the low or medium density polyethylene but the rate of migration of the bactericide is considerably slowed through the high density polyethylene. Thus, the bactericide is substantially prevented from entering the surrounding environment, but rather, is trapped within a “protection zone” adjacent the conduit surface to provide extended protection against microbiologically-influenced corrosion.