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PCB-containing paints stripped safely |
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Hattersheim/Germany, November 2004 - When it came to the choice of a paint remover, ‘Scheidel-macs Asur Entlacker’ made by Scheidel GmbH & Co. KG of Hirschaid easily won the day. The dichloromethane-free paint stripping product proved its effectiveness in removing surface coatings contaminated with polychlorinated biphenyls (PCB) at the Kopernikus high-school in Beckum-Neubeckum, whilst reducing the impact on the environment. Since ‘Asur’ is not health-hazardous, the contractor entrusted with the PCB remediation task – STR Sanierungsteam Ruhr GmbH of Bergkamen – was able to treat large surfaces without relying on sophisticated and costly protection technology. The paint remover owes its outstanding effectiveness to the high dissolving power of the biodegradable DBE® Dibasic Esters solvent made by INVISTA™ Intermediates.
To remove the PCB-contaminated paint from door cases and concrete columns, ‘Asur’ was simply applied by brush to the relevant surfaces. By way of personal protection equipment, only straightforward filtering-type respirator masks had to be worn. By comparison, workers handling the health-hazardous dichloromethane-containing products widely employed as a general-purpose paint remover must wear self-contained respirators which, chemical hazards aside, are clearly more expensive and much less convenient to use.
After a reaction time of just 1 - 2 hours, ‘Asur’ had dissolved the existing coatings without altering the substrate material in any way. For removing the now soft paint, STR had developed a special high-pressure process using low amounts of water. With the aid of this method, all PCB-containing paint residue could be easily rinsed off the door cases and concrete columns. It emerged that the paint remover left no residue whatsoever on the treated surfaces. Workers performing the high-pressure rinsing operation wore a fan-assisted respirator to prevent them from inhaling PCB-contaminated dust or vapours. A colleague picked up the water-paint sludge using a wet-vacuuming unit.
About DBE®
With its improved labour safety and product properties, the DBE® Dibasic Esters product made by INVISTA™ is a good alternative to many conventional solvents, which may often be toxic or carcinogenic. The toxicological safety of DBE® has been conclusively demonstrated by extensive research. The product therefore does not need to be classified as hazardous. Chemically, this solvent alternative consists of the dimethyl esters of adipic, glutaric and succinic acids, which also occur in nature. This accounts for the formulation's good biological and ecological compatibility. Thanks to the high dissolving power of DBE®, the amount of product needed is often markedly less than with conventional solvents. Where a solvent cannot be substituted altogether, it is often possible to minimize hazard potentials and facilitate handling by mixing it with DBE®.
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 DBE-Asur paint stripping.pdf (169 kb)
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