Overview
Polyethylene discs are circular sheets manufactured from polyethylene (PE), one of the most versatile thermoplastic polymers. Available in high-density (HDPE) and low-density (LDPE) variants, these discs leverage polyethylene's inherent properties including chemical inertness, toughness, and ease of fabrication. They serve as cost-effective solutions across industries where non-reactive, durable surfaces are required. Standard diameters range from 10mm to 300mm, with thicknesses typically between 0.5mm to 10mm. Custom configurations are readily available from manufacturers to meet specific application requirements. The material's FDA-compliance for certain grades makes it suitable for food and pharmaceutical applications.
Physical and Chemical Properties
Polyethylene discs exhibit excellent chemical resistance, withstanding acids, alkalis, and most organic solvents at room temperature. HDPE variants offer higher rigidity and temperature resistance (up to 80°C continuous use), while LDPE provides greater flexibility and impact resistance at lower temperatures. The material's low coefficient of friction (0.2-0.3) makes it ideal for applications requiring sliding surfaces. Its dielectric strength (20-50 kV/mm) enables use in electrical insulation. Notably, polyethylene discs maintain dimensional stability across a wide humidity range due to minimal moisture absorption (<0.01% in 24 hours).
Main Applications
In laboratories, polyethylene discs serve as inert surfaces for sample preparation and as disposable work surfaces in cleanrooms. Their chemical resistance makes them ideal for use with aggressive reagents. The medical industry utilizes gamma-sterilized PE discs as protective barriers in diagnostic equipment. Industrial applications include vibration dampening in machinery, where the material's viscoelastic properties absorb shocks. In filtration systems, perforated PE discs function as support layers for membrane filters. Food processing plants employ FDA-compliant grades as cutting boards and packaging components.
Safety and Storage
Polyethylene presents minimal health risks under normal conditions, though dust generated during machining requires standard particulate controls. Thermal decomposition above 200°C may release volatile compounds requiring ventilation. For long-term storage, discs should be kept in original packaging away from direct sunlight to prevent UV degradation. Stacking should be limited to prevent deformation, particularly for LDPE variants. Sterilized medical-grade discs require sealed packaging with desiccants to maintain cleanliness.
B2B Procurement Guide
Industrial buyers should specify material grade (HDPE/LDPE), thickness tolerance (±0.1mm typical), and surface finish requirements (smooth, textured, or embossed). For critical applications, request certificates of analysis including melt flow index and density verification. Bulk purchases (500+ units) typically yield 15-30% cost reductions. Lead times vary from 2 weeks for standard sizes to 6 weeks for customized configurations. Reputable manufacturers provide material traceability and batch testing documentation upon request.
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