What fire-retardant additives are compatible with resin materials for outdoor sofa safety compliance?

When selecting fire-retardant additives for resin materials used in outdoor sofas, it's crucial to ensure compatibility and compliance with safety standards. Common additives include aluminum trihydroxide (ATH), magnesium hydroxide, and halogenated or phosphorus-based flame retardants. These additives work by releasing water vapor or forming a protective char layer to inhibit combustion.

For outdoor applications, UV stability and weather resistance are also key considerations. ATH and magnesium hydroxide are popular due to their non-toxic nature and effectiveness at high loadings. Phosphorus-based additives offer excellent flame resistance but may require additional stabilizers for outdoor use.

Always verify that the chosen additive meets relevant safety standards such as UL 94, CAL 117, or ASTM E84 to ensure compliance for outdoor furniture. Consulting with material suppliers can help tailor the solution to specific resin types like polyethylene, polypropylene, or PVC.