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Tosaf has announced an alternative to chlorine- or bromine-based flamer retardants. The halogen-free grades enable sustainable solutions to fill customer requirements and legal specifications. FR8719PP is specifically designed to meet the flame-retardant requirements of polypropylene in injection molding and extrusion applications.

According to Tosaf,  FR8719PP helps to prevent the spread of fire and meet stringent fire safety criteria in applications such as construction, automotive and shipping packaging without compromising the properties of the material. PP pipes, for example, retain their high impact strength, dimensional stability and chemical resistance without restriction after switching to halogen-free flame retardants. In contrast to many halogen-based flame retardants, FR8719 shows no long-term migration of the active ingredients, and corresponding PP products offer significantly higher UV resistance.

Dispersion of  FR8719PP in injection-molded and extruded PP-based products enables a relatively low dosage and therefore the mechanical properties to be largely retained, but also uniform flame retardance across the entire product. In addition, the low potential for die buildup offers a processing advantage over other halogen-free solutions available on the market.  

The choice of flame retardant depends on which UL94 classification is to be achieved. For example, to fulfill 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.

Tosaf has developed a portfolio of halogen-free flame retardant grades that differ from each other in their flame retardant systems and fulfill individual priorities to achieve the optimum balance between effect and concentration. Their dosage is between 3% and 10%, and depends on the desired classification, type and melt flow index of the PP, 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.