Tnemec Company Inc. has introduced epoxy and vinyl ester linings for secondary containment to its StrataShield product line.
The U.S. Environmental Protection Agency requires secondary containment systems through the Resource Conservation and Recovery Act (RCRA) to prevent any migration of hazardous materials from a tank system to soil, ground or surface water.
The ChemBloc line of vinyl ester and 100 percent solids epoxy linings are fiberglass mat-reinforced systems offered in 65 and 125 mils dry film thickness (DFT). Each chemical-resistant lining system protects against harsh chemicals, thermal cycling, impact and abrasion, the company says. Specific products include:
• Series 206SC ChemBloc, a modified flexible polyamine epoxy, is a glass-reinforced base coat for bridging small substrate cracks in secondary containment concrete structures. The 100% solids coating replaces a mortar/slurry base coat for other ChemBloc linings when a flexible base coat is desired, according to Tnemec.
• Series 237SC ChemBloc, a modified polyamine epoxy lining system;
• Series 239SC ChemBloc, a modified novolac polyamine epoxy lining system; and
• Series 252SC ChemBloc, a novolac vinyl ester lining system.
“The primary reason for choosing one system over another is based on the chemical solutions you’re trying to contain and the concentrations of those solutions,” said Joe Schmit, director of the StrataShield flooring division. “These are thick, monolithic, fiberglass-reinforced lining systems designed to contain chemical spillage for up to 72 hours.”
Surface preparation for ChemBloc lining systems requires abrasive-blast cleaning to remove laitance, form release agents, curing compounds, sealers and other contaminants to provide a profile in accordance with SSPC-SP 13 or NACE No. 6 Surface Preparation of Concrete ICRI-CSP5, the manufacturer notes.
Series 237SC, Series 239SC and Series 252SC are available in two-component resin containment kits consisting of Part A (resin) and Part B (catalyst). These are easily mixed and roller-applied for fiberglass-reinforced mat systems that specify 65 mil thickness, the company says. These coatings are also available in three-component mortar containment kits that include a Part C (aggregate) for trowel-applied mortar/fiberglass reinforced applications requiring 125 mils thickness.
The systems are packaged as 1.5- and 3-gallon kits.
When a flexible, crack-bridging base coat is required, Series 206SC ChemBloc resin may be substituted for Series 237SC, 239SC or 252SC ChemBloc resins to build the base coat. Used as a base coat, Series 206SC ChemBloc aids in keeping hairline cracks in the concrete from causing the containment system to crack, the manufacturer says. Series 206SC is available in a three-gallon kit consisting of parts A (resin), B (catalyst) and C (aggregate).
The ChemBloc secondary containment line covers a majority of the hazardous materials and concentrations typically being stored, Schmit said.
StrataShield is the flooring division of Tnemec, one of the largest privately held companies in North America specializing in industrial coatings for steel, concrete and other substrates for new construction and maintenance. The StrataShield product line also includes surfacers, primers, laminates, self-levelers, mortars and topcoats.