What are the challenges in achieving flame resistance in WPC outdoor tree boxes without toxic additives?

Achieving flame resistance in Wood-Plastic Composite (WPC) outdoor tree boxes without toxic additives presents several challenges. First, WPC materials naturally contain wood fibers, which are highly flammable. Traditional flame retardants often rely on halogenated or phosphorus-based chemicals, which can be harmful to the environment and human health.

To meet safety standards, manufacturers must explore non-toxic alternatives like mineral-based additives (e.g., aluminum hydroxide or magnesium hydroxide). However, these alternatives may reduce mechanical strength or increase production costs. Additionally, maintaining durability and weather resistance while incorporating flame retardants complicates the process.

Balancing eco-friendliness, performance, and cost remains a key hurdle in developing sustainable, flame-resistant WPC tree boxes for outdoor use.