What does "halogen-free" mean?
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According to the "IEC 61249-2-21" standard, halogen-free means that a product contains no more than
- 900 ppm of chlorine or
- 900 ppm of bromine or
- a combined total of
1500 ppm of chlorine and bromine
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| Since 2004 this has been the only existing standard, and it does not refer to adhesives The standard does not involve the other halogens fluorine, iodine and astatine. |
Why do many customers ask for halogen-free products?
Particularly in the USA, flame retardants based on brominated or chlorinated compounds in very high concentrations have been widely used. However, since fire releases gases harmful to health from these compounds, in recent years customers have increasingly asked that all products be halogen-free, including adhesives. Therefore, the above IEC (International Electromechanical Commission) standard was established to govern the halogen freedom of products. In the meantime, often no distinction is made as to whether the halogens are from flame retardants or other sources.
To what extent do halogens arise in adhesives?
In some adhesives, such as special epoxy resins, chlorine bonds are developed during production. In principle, it is possible to purify these products. However, this involves extremely high costs that do not justify the effort.
Does DELO also use halogens in its adhesives?
DELO has never used flame retardants containing halogens for its adhesives. Some adhesives, such as those based on special epoxy resins, typically include a certain base-level amount of chlorine. This does not apply to many adhesives, such as acrylates, as these are halogen-free due to differing production processes.
How is the halogen-freedom of DELO products proven?
The halogen-freedom of DELO adhesives is proven in tests according to the definition of the "IEC 61249-2-21" standard. Extensive test reports are available for a number of products.
Here, you can order reports on your products:
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