Micro-Chek® 11 IPA is an EPA registered , low toxicity industrial mildewcide formulated for the protection of PVC, polyurethane and other polymer compositions susceptible to attack by microorganisms. Micro-Chek® 11 IPA contains 4% of the active ingredient 2-n-octyl-4-isothiazol in-3-one, in a solvent carrier, and is heavy metal-free. Micro-Chek® 11 IPA should be added to the product during the compounding process and mixed thoroughly until homogeneous. Optimum use levels depend on the product formulation and the intended end-use environment to which it will be exposed. Typical use levels range from 1.0- 4.0%.