What are the differences in thermal expansion between plastic outdoor armchair materials?

When selecting plastic outdoor armchairs, understanding thermal expansion differences among materials is crucial for durability and performance. Common plastics like polypropylene (PP), high-density polyethylene (HDPE), and polyvinyl chloride (PVC) exhibit varying responses to temperature changes.

PP is lightweight and flexible but expands significantly under heat, potentially warping over time. HDPE offers better resistance to thermal expansion, making it stable in fluctuating temperatures. PVC, often reinforced, shows moderate expansion but excels in UV resistance.

Factors like thickness, additives, and design also influence expansion rates. For long-term outdoor use, choosing a material with low thermal expansion ensures structural integrity. Consider climate conditions and maintenance needs to make an informed decision for your outdoor furniture.