Halogen-Free Flame Retardants for Polypropylene Applications
Highly active, halogen-free (HFFR) grades are now part of Tosaf’s range as an alternative to flame retardants based on chlorine or bromine, allowing for more environmentally friendly solutions to meet regulatory standards and client demands. FR8719PP is made especially to satisfy polypropylene’s flame-retardant needs in extrusion and injection molding applications.
High efficiency at low concentration
In applications including construction, automotive, and shipping packaging, FR8719PP helps to stop fires from spreading and satisfies strict fire safety standards without sacrificing effectiveness, even at very low concentrations. For instance, after converting to halogen-free flame retardants, PP pipes maintain their high impact strength, dimensional stability, and chemical resistance without any limitations. FR8719 exhibits no long-term migration of the active components, in contrast to many halogen-based flame retardants, and equivalent PP products provide noticeably greater UV protection.
The very good dispersion of FR8719PP in injection-molded and extruded PP-based products is one reason for the very high efficiency of this HF flame retardant. This not only enables a relatively low dosage and therefore the mechanical properties to be largely retained, but also uniform flame retardancy across the entire product. In addition, the low potential for dye build-up (DBU) offers a considerable processing advantage over other halogen-free solutions available on the market.
Broad portfolio of halogen-free flame retardants
The choice of flame retardant depends largely on which UL94 classification is to be achieved. For example, to fulfil the requirements of class V-2, flame retardants in low concentrations are sufficient to eliminate the free radicals formed by the heat of combustion and thus suppress the fire. Only in higher concentrations do they also prevent burning droplets, as required by the UL94 V-0 classification.
They have developed an extensive portfolio of HFFR grades that differ from each other in their flame-retardant systems and fulfil individual priorities to achieve the optimum balance between effect and concentration. Their dosage is between 3 % and 10 % and depends on the desired classification, the type and melt flow index (MFI) of the PP, the thickness of the part and the simultaneous presence of other additives. In contrast, intumescent halogen-free flame retardants require a dose of over 20 % to achieve similar performance.
Expanding the portfolio of conventional flame-retardant additives
In addition to developing new HFFR grades that do not harm health or the environment, Tosaf also fulfils the continuing need for halogen-based products. They combine high thermal stability with high performance to fulfil stringent fire standards without compromising the properties of the product. For example, the brominated flame retardant FR6413PE is suitable for all types of PP pipes, while chlorinated cost-effective flame retardants such as FR0049 can be used for both PE and PP.
State-of-the-art production plant for flame retardants
To meet the growing demand for flame retardants, they have invested in a state-of-the- art production facility. A high-tech laboratory equipped with a cone calorimeter for complete combustion analysis, among other things, is available for testing according to a variety of fire standards. In addition, the company has set up pilot lines that simulate real production conditions and make it possible to taylor flame retardant additives for specific applications.
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