The association of German automotive manufactures (VDA), has created a standard, VDA 278, governing the testing of VOC and fogging values (FOG). The values of the complete multi-layer laminates are decisive. 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 contributes 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.