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Rynite® is a glass fiber-reinforced, semi-crystalline Polyethylene Terephthalate (PET) resin developed by Celanese to meet the rigorous demands of today’s industrial, automotive, and electrical sectors.
Rynite® PET combines the strength and durability of metal with the design flexibility and processing efficiency of thermoplastics. Thanks to its outstanding flow properties, Rynite® PET enables efficient molding of thin or complex geometries at reduced injection pressure—ideal for producing small, high-precision parts.
Rynite® PET by Celanese delivers outstanding thermal stability, electrical insulation, excellent chemical resistance and mechanical strength, making it a go-to material for manufacturers seeking long-term performance and cost-effective production. It’s particularly valuable in replacing die-cast metals, thermosets, and in electrical/electronic or automotive settings.

The main advantages of Rynite® PET grades include:

Outstanding Electrical Performance

• Excellent dielectric strength, even at high temperatures
• Stable performance in humid environments
• Pre-approved for UL Electrical Insulation Systems (Class N, 200°C)— saving customers time and cost in system approvals
   

Superior Thermal Resistance

• Heat Distortion Temperature (HDT) up to 235°C under load
• Continuous RTI (Relative Thermal Index) up to 155°C
• Maintains dielectric properties at elevated temperatures
   

Exceptional Structural Strength

• Available in grades with up to 50% glass fiber reinforcement
• High stiffness, creep resistance, and mechanical strength
• Ideal for metal replacement and lightweight
• Dimensional stability and high-gloss finish
   

Advanced Flame Retardancy

• Halogenated and non-halogenated UL94 V-0 options
• Available in formulations that are PFAS-free and RoHS compliant
• Complies with UL94 V-0, UL f1, and 5VA standards for flame resistance
• Suitable for use in electrical safety-critical applications
   

Typical Applications of Rynite® PET:

Automotive

• Headlamp brackets
• Roof racks
• Wiper arms
• Ignition parts
   

Electrical & Electronics

• Bobbins
• Switches
• Encapsulated motors
• Contactor housings
   

Industrial & Energy

• High-voltage insulators
• Solar panel frames
• Control units
   

Structural and Metal Replacement

• Components requiring strength, durability, and reduced weight
   

Explore the Rynite® PET Portfolio:

• Glass-Filled Grades - Combine very high stiffness with low density, excellent for metal replacement and lightweighting applications
• Flame-Retardant Grades - UL 94 V-0 and UL f1 rated for electrical insulation and safety
• Low-Warp Grades - Designed for applications requiring superior dimensional stability
• Hydrolysis-Resistant Grades - Engineered for high heat and humidity environments, offering superior durability in challenging conditions
• Toughened grades - Designed to replace thermoset materials
   

By choosing Rynite® PET from Celanese, manufacturers gain access to a versatile and reliable engineering thermoplastic that enhances product performance and longevity. Whether for automotive, electrical & electronics or industrial applications, Rynite PET offers a proven solution that meets industry standards while providing excellent mechanical, thermal, and electrical properties. Explore the full potential of Rynite® PET and discover how this advanced polymer can elevate your next project.