Overview
PCTG (Polycyclohexylenedimethylene Terephthalate Glycol) is a high-performance copolyester that combines the clarity of PET with enhanced toughness from cyclohexanedimethanol (CHDM) modification. This amorphous thermoplastic offers superior impact resistance compared to standard PETG, making it ideal for applications requiring durability without sacrificing optical clarity. First commercialized in the 1980s, PCTG has gained prominence in medical and food-contact applications due to its chemical resistance and compliance with stringent regulatory standards. The material's versatility allows for various processing methods including injection molding, extrusion, and thermoforming.
Physical and Chemical Properties
PCTG exhibits excellent mechanical properties with an elongation at break typically ranging from 100-300%, significantly higher than conventional PET. Its notched Izod impact strength measures 80-100 J/m, making it remarkably shatter-resistant. The material maintains clarity with light transmittance exceeding 90% and haze below 2% in transparent grades. Chemically, PCTG demonstrates good resistance to alcohols, weak acids, and oils, though it may be attacked by strong bases and some chlorinated solvents. The material has a Vicat softening temperature of 70-85°C and can withstand short-term exposure to temperatures up to 100°C without significant deformation.
Main Applications
In the medical field, PCTG is extensively used for surgical instrument handles, diagnostic device components, and pharmaceutical packaging due to its gamma radiation resistance and autoclave compatibility. The food industry employs PCTG for beverage containers, microwaveable trays, and transparent food packaging that requires impact resistance at refrigeration temperatures. The material's excellent thermoforming characteristics make it popular for point-of-purchase displays and protective packaging. Emerging applications include 3D printing filaments for engineering prototypes and clear functional parts, where its low warpage and dimensional stability are particularly valuable.
Safety and Storage
PCTG is generally recognized as safe for food contact applications when produced under proper manufacturing conditions, meeting FDA 21 CFR 177.1630 and EU 10/2011 regulations. However, specific formulations should be verified for compliance with intended use cases, particularly for medical applications requiring USP Class VI certification. Proper storage involves keeping the material in its original packaging in a dry environment below 30°C with relative humidity under 50%. Prolonged exposure to UV light should be avoided as it may cause yellowing. Before processing, PCTG typically requires drying at 65-75°C for 3-4 hours to achieve moisture content below 0.02%.
B2B Procurement Guide
When sourcing PCTG, specify requirements for FDA compliance, impact strength (notched Izod), and optical properties (haze, transmittance) based on application needs. Technical datasheets should include rheological data (melt flow index) and thermal properties (HDT under load) for processing compatibility assessment. For colored variants, request colorfastness testing results and UV stability certifications if outdoor use is anticipated. Consider minimum order quantities (typically 500-1000 kg for standard grades) and lead times (2-6 weeks) when planning procurement. Third-party material testing services can verify critical properties before large-scale purchases.
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