How do fillers like calcium carbonate alter the impact resistance of resin-based outdoor sofas?

Calcium carbonate fillers are commonly used in resin-based outdoor sofas to enhance their mechanical properties, particularly impact resistance. These fillers act as reinforcing agents, dispersing stress more evenly across the material when subjected to sudden forces. By increasing stiffness and reducing brittleness, calcium carbonate helps prevent cracks and fractures from impacts such as falling objects or rough handling.

The filler's particle size and distribution play a critical role—fine, evenly dispersed particles improve toughness without sacrificing flexibility. Additionally, calcium carbonate is cost-effective and environmentally friendly, making it a popular choice for outdoor furniture manufacturers.

Tests show that resin composites with optimal filler content (typically 10-30% by weight) exhibit significantly higher impact resistance compared to unfilled resin. This makes calcium carbonate-filled outdoor sofas more durable in harsh weather conditions and high-traffic environments. Properly formulated, these sofas maintain their aesthetic appeal while offering long-term structural integrity.