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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.