Overview
Extrusion-grade copolyester is a modified form of polyethylene terephthalate (PET) engineered specifically for extrusion processing. The copolymerization with glycol (commonly cyclohexanedimethanol) disrupts the polymer's crystallinity, resulting in improved melt strength and processing characteristics compared to standard PET. This thermoplastic demonstrates superior dimensional stability during extrusion, making it particularly valuable for producing thin films and complex profiles. Manufacturers typically supply the material in pellet form with controlled particle size distribution to ensure consistent feeding in extrusion equipment.
Physical and Chemical Properties
The material exhibits a unique balance of clarity and toughness, with light transmission reaching 90% in transparent grades. Its glass transition temperature (Tg) typically ranges between 75-85°C, significantly higher than many competing extrusion polymers like PVC. Chemically, extrusion-grade copolyesters demonstrate excellent resistance to oils, greases, and weak acids, though they may degrade in strong alkalis. The glycol modification reduces moisture absorption compared to standard PET, with water absorption rates below 0.3% at 23°C/50% RH.
Main Applications
In packaging, this material dominates medical blister packs and food containers requiring clarity and impact resistance. The automotive industry utilizes it for interior trim components and protective edge profiles due to its scratch resistance and weatherability. Industrial applications include electrical insulation sleeves, point-of-purchase displays, and protective window films. Recent developments have expanded its use in 3D printing filaments, where its combination of strength and clarity offers unique advantages over ABS and PLA.
Safety and Storage
While generally safe at processing temperatures below 280°C, thermal degradation above this threshold may release acetaldehyde. Proper material handling requires drying at 65-75°C for 4-6 hours before processing to prevent hydrolysis. Storage should occur in moisture-proof packaging with desiccant. Opened bags require resealing and should be used within 48 hours in humid environments. Bulk storage silos must maintain nitrogen purging or dehumidified air circulation to prevent moisture absorption.
B2B Procurement Guide
Industrial buyers should specify key parameters: intrinsic viscosity (0.70-0.85 dl/g typical), color index (L*,a*,b* values), and FDA compliance status for food contact applications. For extrusion coating applications, request melt strength data and neck-in behavior test results. Leading manufacturers include Eastman (Tritan), SK Chemicals (Skygreen), and DuPont (Selar). Minimum order quantities typically start at 500kg for standard grades, with lead times of 4-6 weeks for custom formulations. Consider requesting processing guides specific to your extrusion equipment type (single/twin screw).
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