Choosing Flame Retardants for Polypropylene (PP)
Halogenated vs Halogen-Free Flame Retardants: Trade-offs
High-temperature demands
Polyamide and PBT process above 260 C and are common in electrical connectors, so flame retardants must survive processing and meet strict UL ratings and CTI requirements.
Suitable products
DBDPE and BT-93W are preferred for their high decomposition temperatures. In glass-reinforced grades, the reinforcement worsens the candle-wick effect, so loading and synergist levels are raised accordingly.
Electrical properties
For connectors, comparative tracking index (CTI) and colour stability matter. High-purity antimony trioxide and well-dispersed brominated additives help maintain these properties.
Frequently Asked Questions
What flame retardant is used in nylon?
DBDPE and BT-93W with antimony trioxide are used in PA6 and PA66, chosen for their high thermal stability.
Why is glass-reinforced nylon harder to flame retard?
Glass fibres promote the candle-wick effect, so higher flame retardant and synergist loadings are usually required.
Need a quotation or technical data sheet?
Shandong Haiwang Chemical supplies brominated flame retardants, antimony trioxide and oilfield bromides worldwide. Tell us your product, grade, quantity and destination port and our team will reply quickly. Visit our products page or contact us — email mikeyang@haiwangchemical.com.