Static Coefficients of Friction for Various Engineering Materials Material Coefficient of Friction (Static) Range Plastics PTFE (Teflon) 0.10–0.25 PE (Polyethylene, Rigid) 0.40–0.50 PE (Polyethylene, Flexible) 0.65–0.75 PP (Polypropylene) 0.35–0.45 POM (Polyoxymethylene) 0.25–0.50 PA (Polyamide, Nylon) 0.30–0.50 PBT (Polybutylene Terephthalate) 0.30–0.40 PS (Polystyrene) 0.45–0.60 SAN (Styrene-Acrylonitrile) 0.45–0.65 PC (Polycarbonate) 0.40–0.65 PMMA (Acrylic) 0.60–0.70 ABS (Acrylonitrile Butadiene Styrene) 0.60–0.75 PVC (Polyvinyl Chloride) 0.55–0.60 Metals Aluminum 0.30–0.45 Steel (Mild) 0.60–0.80 Stainless Steel 0.50–0.60 Copper 0.30–0.40 Brass 0.30–0.35 Titanium 0.30–0.35 Composites and Other Materials GFRP (Glass-Fiber Reinforced Polymer) 0.30–0.35 CFRP (Carbon-Fiber Reinforced Polymer) 0.25–0.30 Rubber (Natural) 1.0–4.0 (varies widely) Wood (Dry) 0.30–0.50 Wood (Wet) 0.40–0.60 Ceramics Alumina 0.20–0.25 Silicon Carbide 0.25–0.30 Zirconia 0.20–0.30 Explanation of Static Fric...