What are the flame spread ratings for plastic outdoor flower pots in urban settings?

Plastic outdoor flower pots are popular in urban settings due to their durability and affordability. However, their fire safety, particularly flame spread ratings, is a critical consideration. Flame spread ratings measure how quickly flames propagate across a material's surface, classified by standards like ASTM E84 or UL 723. In urban areas, where fire safety regulations are stringent, plastic pots must often meet specific flame spread criteria—typically a Class C (76-200) or better rating for outdoor use. Factors like material composition (e.g., polypropylene, recycled plastics) and additives (flame retardants) influence these ratings. Always check local codes and opt for pots labeled as fire-resistant to ensure safety in high-density environments.