A 4.5 mm SPC plank looks simple from above, but it is a carefully engineered composite. Understanding each layer helps you judge quality and ask better questions when sourcing. 1. UV layerThe top coating protects against stains and ultraviolet light, and it adds anti-bacterial properties. It slows fading and ageing. 2. Wear layerThis transparent coat, listed at 0.3–0.7 mm, takes the daily...