Full definition
A two-component epoxy paste filled with metallic particles (steel, aluminum, bronze, or ceramic) that can be applied by hand to rebuild eroded, corroded, or worn metal surfaces without welding, machining, or heat. After mixing (kneading or troweling the resin and hardener components), the putty is applied to the prepared surface and cures at room temperature to a hard, machinable solid within 1-24 hours depending on formulation. Compressive strength: 70-120 MPa (comparable to cast iron). Tensile: 20-40 MPa. Temperature resistance: up to 120-230°C depending on formulation. Types: (1) Steel-filled (gray) — general metal repair, pump housings, valve bodies, pipe fittings. (2) Aluminum-filled (silver) — for aluminum components, low thermal expansion match. (3) Wear-resistant — ceramic or tungsten carbide particles for abrasion-prone surfaces. (4) Rapid-cure — fixture in 5-10 min for emergency repairs. The cured putty can be drilled, tapped, ground, filed, and painted like metal. Surface preparation: clean, degrease, and roughen the repair area (wire brush or grind to bright metal). Per ASTM D695 (compressive) and D638 (tensile). Brands: Devcon (ITW — the market leader, Plastic Steel, Titanium Putty), Loctite Nordbak (Henkel), Belzona (metal polymer systems). Applications: pump housing repair, pipe leak repair, worn shaft rebuilding, and erosion protection on chutes and hoppers.