Manhole ChimneySeal No. F-88 is an elastomeric lining composed of fiber-reinforced, asphalt-modified urethane. It is used as a chemical-resistant membrane /gasket seal that prevents water infiltration. This product has excellent substrate adhesion. As a high solids elastomer, the product is recommended when movement caused by temperature change or other causes is expected. It maintains elasticity and adhesion over a vast temperature range, and the barrier resists freeze/thaw stresses and movement. The product also resists alkalies, salts and acid.