MATERIALS | FLAME RETARDANTS
formation and lowering heat and smoke release. Huber says the 600 series grades can partially or fully replace antimony trioxide (ATO) and zinc borate. It says they offer a good balance of price and performance for cost sensitive applications. The Safire 400 nitrogen-phosphorus fire
retardant is claimed to provide superior fire retardancy, smoke suppression and char formation compared to other commonly available phosphate products. Its technology also offers synergistic opportunities with Huber’s existing alumina trihydrate (ATH), magnesium hydroxide (MDH) and Kemgard molybdate products. It is suitable for use with polyolefins, polyamides, and thermoplastic polyesters, as well as epoxies and polyurethanes.
Intumescent progress Combining reinforcing agents such as glass fibres (GF) with flame retardants in polyolefin compounds can be a challenge when the preferred flame retardant is a halogen-free intumescent type, according to Adeka. Thermal stability can be a particular challenge as reinforced compounds require higher processing temperatures than unreinforced compounds. At these elevated
processing temperatures the low thermal stability of conventional intumescent flame retardants can lead to premature initiation of the char formation reaction. Adeka claims its intumescent flame retardants have a higher thermal stability than conventional intumescent type products, so this issue can be avoided. It says that the opportunity to combine reinforcing agents and halogen-free intumescent flame retardants in PP compounds could open up more metal-substitution applications. In terms of fire safety, Adeka points out that
glass fibres can enhance the performance of intumescent FR systems by acting as an anti-drip- ping agent. It says a 30% reinforced PP with 23% of ADK Stab FP-2500S can achieve UL94 V-0 at 1.6mm thickness; without reinforcement around 30% of flame retardant is typically needed to achieve the same rating. “Moreover, raising the dosage of ADK Stab FP-2500S to 28% allows V-0 at 0.8mm thick- ness to be achieved as well as 5VA rating at 1.6mm,” the company says. Long-term thermal stability can also be en- hanced for automotive applications, Adeka says. Oven ageing tests at 150°C to assess crack forma- tion in reinforced PPs containing various types of
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