Overview
Polyester chip, or polyethylene terephthalate (PET) chip, is a primary raw material for producing polyester fibers, films, and rigid plastic containers. Derived from purified terephthalic acid (PTA) and monoethylene glycol (MEG), it undergoes polymerization and solid-state polycondensation to achieve desired molecular weight and crystallinity. Its versatility stems from balanced mechanical properties, transparency (in amorphous form), and recyclability, making it a cornerstone of the global plastics and textiles industries. Manufacturers classify chips by intrinsic viscosity (IV) grades, with fiber-grade (0.60–0.68 dl/g) and bottle-grade (0.72–0.84 dl/g) being the most common.
Physical and Chemical Properties
Polyester chips exhibit semi-crystalline structures when cooled slowly, contributing to their dimensional stability and strength. They possess a glass transition temperature (Tg) of 67–81°C and degrade above 350°C, releasing acetaldehyde and carbon monoxide. Chemically inert to weak acids and oils, PET chips are susceptible to hydrolysis at high temperatures, necessitating strict moisture control during storage and processing. Their oxygen barrier properties (25–30 cm³·mil/(100 in²·day·atm)) make them ideal for carbonated beverage packaging.
Main Applications
Over 60% of global polyester chip production supplies the textile industry for spun yarns, staple fibers, and non-woven fabrics. In packaging, chips are extruded into preforms for blow-molded bottles or biaxially oriented films (BOPET) for food wrappers and laminates. Emerging uses include engineering plastics (with glass fiber reinforcement) and solar panel backsheets. Recycled PET (rPET) chips, processed from post-consumer bottles, are gaining traction in sustainable textiles and food-contact applications after FDA-compliant super-cleaning.
Safety and Storage
Polyester chips pose minimal acute hazards but require precautions during high-temperature processing to prevent thermal decomposition fumes. NFPA ratings classify them as Health: 1, Flammability: 1, Reactivity: 0. Storage silos or bags should maintain relative humidity below 0.4% to prevent IV drop from moisture absorption. UV degradation occurs during prolonged outdoor exposure; additives like titanium dioxide or UV stabilizers mitigate this in end-products.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 9001 certification and batch-wise quality test reports detailing IV, carboxyl end groups (CEG), and diethylene glycol (DEG) content. Fiber-grade chips typically command 5–10% lower prices than bottle-grade. Just-in-time procurement is discouraged due to potential crystallization during extended storage. For recycled-content products, request Global Recycled Standard (GRS) or FDA compliance documentation. Containerized shipments (25 MT bags) are cost-effective for overseas orders.
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