Industry News

GRILTEX Hotmelt Adhesives - The Alternative to Flame Bonding

Published on 2006-11-13. Author : SpecialChem

For decades now, automobiles and emissions have been a frequent topic in trade journals and daily newspapers. Substances from outside the vehicle can be eliminated using suitable filter systems.

Emissions from automotive interior trim parts are more problematic. Fogging, which causes a persistent coating on the inside of the vehicle´s windows, has long been a thorn in the side of automotive manufacturers. Fogging is caused by volatile organic compounds (VOC´s) which can also cause allergies or make passengers feel unwell when traveling. As it is not possible to filter these VOC´s, the only option is to use components that have a low emission level.

The association of German automotive manufactures (VDA), has created a standard, VDA 278, governing the testing of VOC and fogging values (FOG). Decisive are the values of the complete multi-layer laminates. The emissions from the adhesives are also ascertained. Regardless what foam is used for conventional flame bonding, the maximum permissible levels are exceeded by far. However, the alternative to flame bonding, laminating with hotmelt adhesives based on copolyesters show the lowest VOC and fogging values. Griltex CoPolyester only contribute with an insignificant amount of the total emissions of the complete composite. This share is mostly in single-digit percentages. These very low values provide greater freedom of choice for the other components including a firmer foam for improved seating comfort.

The standard polyester foams normally used exceed the permissible fogging values even if supplied as a low-fogging version. Therefore it is necessary to change over to low emission polyether foam as well as using Griltex copolyester adhesives. Polyethers are known as difficult to bond to. Even here Griltex copolyesters offer many solutions, which fulfill the stringent demand for high bonding values by the OEMs.

Source: Garvson

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