Overview
High-Flow Cyclic Olefin Copolymer (COC) is a premium thermoplastic derived from norbornene and ethylene. Developed in the 1990s, it bridges the gap between conventional plastics and high-performance polymers like PMMA and PC. Its unique cyclic structure grants exceptional dimensional stability and purity, making it ideal for regulated industries like healthcare and optics. COC is manufactured through metallocene catalysis, enabling precise control over molecular weight and flow properties. Grades with high melt flow rates (MFR > 50 g/10min) are particularly valued for thin-wall molding applications, reducing cycle times by up to 30% compared to standard polymers.
Physical and Chemical Properties
COC exhibits a glass transition temperature (Tg) ranging from 70°C to 180°C, adjustable via monomer ratios. Its refractive index (1.53) and Abbe number (58) rival optical glass, with near-zero birefringence for laser applications. The material’s water absorption is 10x lower than polycarbonate, ensuring stability in humid environments. Chemically, COC resists acids, alkalis, and polar solvents but swells in non-polar hydrocarbons like hexane. Its dielectric constant (2.35 at 1 MHz) and loss tangent (0.0002) make it suitable for high-frequency PCBs. Notably, it meets USP Class VI and ISO 10993 standards for biocompatibility.
Main Applications
In medical technology, COC dominates prefillable syringes and diagnostic microfluidic chips due to its leachability resistance and autoclave stability (up to 121°C). Pharmaceutical packaging utilizes its moisture barrier properties, extending drug shelf life by 2–3x versus traditional plastics. Optically, COC replaces glass in AR/VR waveguides and camera lenses, offering 92% light transmission with anti-fog properties. Electronics manufacturers use it for 5G antenna housings and flexible OLED substrates, leveraging its low dielectric loss and thermal expansion coefficient (60 ppm/K).
Safety and Storage
COC pellets are non-hazardous under OSHA standards but require dust control during handling to avoid respiratory irritation. Processors should use vented barrels above 280°C to prevent monomer off-gassing. Recycled material must be thoroughly dried (4 hours at 80°C) to prevent hydrolysis. Long-term storage mandates humidity-controlled environments (<40% RH) to prevent pellet clumping. UV-sensitive grades should be kept in opaque containers or foil-lined bags. Shelf life typically exceeds 24 months when stored below 30°C.
B2B Procurement Guide
Industrial buyers should prioritize suppliers with ISO 13485 certification for medical-grade COC. Key specifications include MFR (tested per ISO 1133), haze level (<1% for optical grades), and residual catalyst content (<5 ppm). Bulk orders (20+ tons) commonly attract 8–12% discounts. For prototyping, request DSC and FTIR reports to verify thermal and chemical consistency. Just-in-time delivery is recommended for high-clarity applications to prevent yellowing from prolonged storage. Emerging alternatives include cycloolefin polymer (COP) for higher Tg requirements.
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