How does the oxygen index of PVC affect its flammability in outdoor seating?

The oxygen index (OI) of PVC is a critical factor in determining its flammability, especially in outdoor seating applications. The OI measures the minimum concentration of oxygen required to sustain combustion, with higher values indicating better fire resistance. PVC typically has an OI of around 25-45%, making it inherently flame-retardant compared to other plastics.

In outdoor seating, where exposure to heat sources or accidental ignition is possible, a higher OI ensures slower burning and self-extinguishing properties. This reduces fire hazards and enhances safety. Manufacturers often modify PVC formulations to increase its OI, adding flame retardants to meet stringent safety standards.

Understanding the relationship between PVC's oxygen index and flammability helps in selecting the right material for durable, fire-resistant outdoor furniture. This knowledge ensures compliance with regulations and improves product longevity in high-risk environments.