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2005-10-18 News Headlines Chemicals

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Halogen-Free Flame Retardants for Transparent Coatings

Using high-grade wood veneers for aircraft cabins can now be coated with halogen-free transparent coating systems.

Although flame retardants for wood, plastics, elastomers and textiles already exist, until now there were none for transparent coating systems that were halogen-free. Lufthansa Technik AG, Hamburg, was looking for a way to fit flame-retardant high-grade wood veneers in luxury aircraft such as Boeing and Airbus that complied with the aviation standard FAR 25.853. This specifies that after one minute of contact with flames, the material must self-extinguish within 15 seconds. The height of the flames must not exceed 15 cm.

Disflamoll® and LevagardTM flame retardants from LANXESS Deutschland GmbH, real wood veneers for aircraft cabins can now be coated with halogen-free transparent coating systems.

Although the previous standard system with a TCEP-modified transparent coating consistently met fire protection requirements, Lufthansa Technik AG wished to deploy halogen-free systems in the future. Alfred Clouth Lackfabrik GmbH & Co of Offenbach, whose specialties include polishable, flame-retardant high-gloss varnish for wood, came up with just the right formulation to protect aircraft fittings in compliance with relevant standards. The glass fiber-reinforced honeycomb components were laminated with impregnated real wood veneer and coated with an aliphatic, highly crosslinked polyurethane coating. The LANXESS flame retardants from the LevagardTM and Disflamoll® ranges use impregnation and a transparent multi-layer coating system to ensure halogen-free flame retardance.

As well as aviation, this type of coating is likely to be in demand for other applications too. The application potential for impregnations and coatings containing Disflamoll® and LevagardTM ranges from furniture right through to treating construction lumber.

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