Ertalyte Plastic Machining — Precision and Durability
What Is Ertalyte?
Ertalyte® is a semi-crystalline, unreinforced thermoplastic polyester based on polyethylene terephthalate (PET-P). It is one of the most dimensionally stable engineering plastics available for precision machining — combining high mechanical strength, outstanding wear resistance, low coefficient of friction, and excellent chemical resistance in a material that machines cleanly to tight tolerances.
Developed as a superior alternative to nylon and acetal in demanding tribological and structural applications, Ertalyte® is used wherever components must maintain exact dimensions under sustained mechanical loads, elevated temperatures, and repeated sliding contact. Both its natural and black versions are FDA-compliant, and natural Ertalyte® meets USDA, 3A-Dairy, and Canadian AG regulatory requirements — making it a trusted material for precision components in regulated industries.
Key Material Properties of Ertalyte® (PET-P)
High Mechanical Strength and Stiffness: Ertalyte® offers tensile strength and flexural modulus values that exceed those of both standard nylon (PA6, PA66) and acetal (POM) in comparable unreinforced form — particularly at elevated temperatures, where nylon and acetal begin to lose stiffness.
Superior Wear Resistance: PET-P’s semi-crystalline structure delivers a low, uniform coefficient of friction and exceptional abrasion resistance under both wet and dry sliding conditions — outperforming unmodified nylon and acetal in many tribological applications.
Excellent Dimensional Stability: Ertalyte® has very low moisture absorption (far below nylon), meaning its dimensions remain stable regardless of humidity or exposure to water. This is a critical advantage in precision components where dimensional accuracy must be maintained regardless of environmental conditions.
High Continuous Service Temperature: Ertalyte® has a continuous service temperature of 100°C (210°F) and a melting point approximately 83°C (150°F) higher than acetal — enabling use in applications that would soften or distort acetal components.
Chemical Resistance: Ertalyte® resists moderate acid solutions, aliphatic hydrocarbons, oils, and many organic solvents. It is not resistant to strong alkalis, strong oxidizing agents, or chlorinated solvents at elevated temperatures.
Physiological Inertness: Ertalyte® is non-toxic, non-staining, and physiologically inert — important attributes for components in contact with food, beverages, or pharmaceutical products.
Ertalyte® TX — The Internally Lubricated Variant
Ertalyte® TX is a modified PET-P grade that incorporates a uniformly dispersed solid lubricant within the polymer matrix — similar in concept to Delrin® AF. This internal lubrication further reduces the coefficient of friction and wear rate, bringing them below those of standard Ertalyte®, and even outperforming internally lubricated acetal grades in many sliding-contact applications. Ertalyte® TX is light gray and the preferred grade for the most demanding wear and friction applications.
Machining Ertalyte®
Ertalyte® machines differently from nylon and acetal because of its higher stiffness and better thermal performance. Its rigidity provides excellent chip formation and dimensional control during CNC turning, milling, drilling, and threading. Key machining considerations include:
- Sharp, well-maintained cutting tools for clean cuts and minimal heat generation
- Adequate coolant to prevent heat buildup and thermal distortion
- Conservative feed rates on thin-walled sections to prevent vibration and chatter
- Post-machining stress relief for critical precision components to ensure dimensional stability
Ertalyte® can be machined to very tight tolerances — comparable to metal components — making it suitable for applications with demanding geometric requirements.
Industry Applications of Ertalyte®
Precision Mechanical Components: Gears, bushings, guides, bearings, and wear pads in industrial machinery exploit Ertalyte®’s unique combination of dimensional stability, stiffness, and tribological performance under sustained loads.
Semiconductor and Electronics Manufacturing: Wafer-handling fixtures, guide rails, and precision-positioning components in semiconductor equipment require the dimensional stability and chemical cleanliness that Ertalyte® provides.
Automotive: Fuel system components, precision bearing elements, and wear-resistant sliding surfaces use Ertalyte® for its broad chemical resistance and high-temperature performance relative to nylon or acetal.
Defense and Military: Joint levers, precision instrument housings, and load-bearing sliding components in defense equipment utilize Ertalyte® for demanding performance reliability.
Medical and Dental Equipment: Dental prosthetics and precision instrument components for pharmaceutical testing equipment use Ertalyte® for its FDA compliance, dimensional precision, and physiological inertness.
Testing of Ertalyte® Components
Material testing of Ertalyte® components covers:
- Tensile and flexural testing (ASTM D638, D790): Confirming mechanical properties at ambient and elevated temperatures
- Wear and friction testing (ASTM D3702, G99): Evaluating tribological performance in sliding contact configurations
- Dimensional stability testing: Measuring dimensional changes after thermal cycling, humidity exposure, and machining stress relief
- Chemical resistance testing (ASTM D543): Evaluating resistance to specific service fluids
- Hardness testing (ASTM D785): Rockwell M or R hardness to verify material grade and consistency
Why Choose Infinita Lab for Ertalyte® Testing?
Infinita Lab is a leading provider of engineering plastic testing services, addressing the critical challenges faced by emerging businesses and established enterprises. With access to a vast network of 2,000+ accredited partner labs across the United States, Infinita Lab ensures rapid, accurate, and cost-effective testing solutions for Ertalyte® and all PET-P-based materials — from mechanical characterization to tribological and dimensional stability testing.
Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you. Request a Quote.
Frequently Asked Questions
How does Ertalyte® compare to nylon (PA) and acetal (POM) for precision machined parts? Ertalyte® offers better dimensional stability (lower moisture absorption than nylon), higher stiffness and service temperature than both nylon and acetal, and superior wear resistance in many sliding applications. It is preferred where dimensional precision and thermal performance are paramount.
What is the difference between Ertalyte® and Ertalyte® TX? Standard Ertalyte® is an unmodified PET-P grade. Ertalyte® TX contains uniformly dispersed solid lubricant, providing a lower coefficient of friction and wear rate than the base grade — making it the preferred choice for the most demanding tribological applications.
Is Ertalyte® suitable for contact with food and beverages? Yes. Natural Ertalyte® is FDA, USDA, 3A-Dairy, and Canada AG compliant — making it suitable for components in direct contact with food, beverages, and food processing environments.
What machining operations can be performed on Ertalyte®? Ertalyte® can be CNC turned, milled, drilled, threaded, and bored to tight tolerances. Its higher stiffness compared to nylon and acetal provides better chip formation and dimensional control, though proper tooling and thermal management are important for optimal results.
What ASTM standards apply to testing Ertalyte® components? Relevant standards include ASTM D638 (tensile), ASTM D790 (flexural), ASTM D785 (Rockwell hardness), ASTM D543 (chemical resistance), ASTM D3702 (wear and friction), and ASTM D570 (water absorption).
