Plastic Stock

About plastic stock

Plastic stock refers to semi-finished plastic materials, typically in sheet, rod, or tube form, used for machining custom components. Common materials include Delrin (acetal), known for its high strength, stiffness, and low friction; High-Density Polyethylene (HDPE), valued for its chemical resistance and impact strength; Ultra-High Molecular Weight Polyethylene (UHMW), offering exceptional abrasion resistance and low coefficient of friction; Polytetrafluoroethylene (PTFE), recognized for its extreme temperature resistance and non-stick properties; Nylon, chosen for its toughness, wear resistance, and chemical compatibility; and Polycarbonate, favored for its optical clarity, impact resistance, and high heat deflection. Selection is primarily based on material type, defined by mechanical properties such as tensile strength, flexural modulus, and impact strength (e.g., Izod notched). Thermal characteristics like continuous use temperature and coefficient of thermal expansion are critical. Chemical compatibility, dielectric strength, and UV resistance may also be defining factors. Dimensions are specified by thickness, width, and length for sheets, or by diameter and length for rods and tubes. Surface finishes are typically as-extruded or as-cast, with no further treatment.