Polyethylene[15]
Overview
Polyethylene (PE) is the most commonly produced plastic globally, accounting for over 30% of total polymer demand. It is synthesized through the polymerization of ethylene monomers, a process pioneered in the 1930s by Imperial Chemical Industries (ICI). PE's popularity stems from its cost-effectiveness, ease of processing, and adaptability to diverse applications. The material is classified by density: low-density (LDPE), high-density (HDPE), and linear low-density (LLDPE) variants. Each type offers distinct mechanical properties, making PE suitable for applications ranging from flexible food packaging to rigid water pipes.
Physical and Chemical Properties
Polyethylene exhibits exceptional chemical resistance, withstanding acids, alkalis, and most organic solvents at room temperature. Its non-polar structure makes it hydrophobic, preventing water absorption. The material's flexibility increases with decreasing density—LDPE is more pliable than HDPE, which offers higher tensile strength. Thermal properties vary by type: LDPE softens at 80–100°C, while HDPE maintains structural integrity up to 120°C. All PE grades degrade under UV exposure unless stabilized with additives. Electrical insulation properties are outstanding, with volume resistivity exceeding 10¹⁶ Ω·cm.
Main Applications
Packaging dominates PE consumption, with LDPE used for shrink films and grocery bags, while HDPE serves in milk jugs and detergent bottles. In construction, HDPE pipes are preferred for water distribution due to corrosion resistance. LLDPE's puncture resistance makes it ideal for heavy-duty sacks and geomembranes. Consumer goods utilize PE in toys, housewares, and furniture. Medical applications include sterilizable containers and orthopedic implants. Recent innovations include cross-linked PE (PEX) for radiant heating systems and ultra-high-molecular-weight PE (UHMWPE) for bulletproof vests and artificial joints.
Safety and Storage
PE is generally regarded as non-toxic and FDA-approved for food contact. However, decomposition products from overheating (above 300°C) may include irritating aldehydes and ketones. Proper ventilation is essential during thermal processing like extrusion or injection molding. Storage should prevent oxidative degradation: keep bales or pellets in original packaging away from sunlight. Bulk powder forms require explosion-proof facilities due to dust explosion risks. PE is not biodegradable but can be recycled (resin identification codes #2 and #4).
B2B Procurement Guide
Industrial buyers should specify: 1) PE type (density and melt flow index), 2) required certifications (FDA, NSF, etc.), 3) additive package (UV stabilizers, anti-block agents), and 4) physical form (pellets, powder, or preforms). Bulk purchases (20+ metric tons) typically secure 5–15% discounts. Evaluate suppliers based on consistent quality control, capacity for custom formulations, and logistical capabilities. Asia-Pacific producers dominate commodity PE, while specialty grades often come from Western manufacturers. Monitor ethylene feedstock price trends, as they directly affect PE pricing.
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