Overview
Easy-to-process PCTG (Polycyclohexylenedimethylene Terephthalate Glycol) granules are a thermoplastic copolymer combining the clarity of PET with the flexibility of glycol-modified polymers. Developed as an alternative to PC and PETG, PCTG excels in injection molding and extrusion applications due to its low crystallinity and high flowability. PCTG is favored in industries requiring stringent hygiene standards, such as medical devices and food packaging, owing to its BPA-free composition and sterilization compatibility (e.g., gamma radiation, ethylene oxide). Its balance of toughness and transparency also makes it ideal for consumer product casings and display components.
Physical and Chemical Properties
PCTG granules exhibit a unique combination of mechanical and optical properties. With a tensile strength of 50-60 MPa and elongation at break exceeding 100%, they outperform many amorphous plastics in durability. The material maintains 90% light transmittance, rivaling polycarbonate, while offering better UV resistance. Chemically, PCTG resists dilute acids, alkalis, and alcohols but may degrade in ketones or chlorinated solvents. Its Vicat softening temperature (approximately 85°C) ensures stability in moderate-heat environments. The low moisture absorption rate (<0.3% in 24h) minimizes pre-drying requirements before processing.
Main Applications
In the medical sector, PCTG is used for IV connectors, surgical trays, and blister packs due to its autoclavability and compliance with ISO 10993-1. The packaging industry employs it for cosmetic jars and tamper-evident closures, leveraging its scratch resistance and gloss retention. 3D printing enthusiasts value PCTG filaments for their minimal warping and layer adhesion superior to ABS. Emerging applications include RFID antenna substrates (for dielectric stability) and automotive interior trims, where its low VOC emission meets industry standards.
Safety and Storage
While PCTG is generally recognized as safe (GRAS) for food contact, processors should adhere to temperature limits (barrel temps: 230-260°C) to prevent thermal degradation and acetaldehyde formation. Use desiccant dryers (<0.02% moisture content) to prevent hydrolysis during injection molding. Granules should be stored in original moisture-proof bags with desiccants. Opened bags must be resealed or transferred to airtight containers. Shelf life typically exceeds 12 months when stored below 30°C and 50% relative humidity.
B2B Procurement Guide
When sourcing PCTG granules, prioritize suppliers offering full technical dossiers including ISO 13485 certification for medical grades. Key specifications to verify include: intrinsic viscosity (0.7-0.9 dl/g), haze (<3%), and yellowness index (<2.5). For cost-sensitive projects, recycled-content PCTG (post-industrial) can reduce prices by 15-30%, but may require additional testing for clarity consistency. Large-volume buyers (10+ tons) should negotiate contracts with raw material price adjustment clauses linked to PTA (Purified Terephthalic Acid) market trends.
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