Which engineering plastics offer the best chemical resistance? | Insights by Bost

Which Engineering Plastics Offer the Best Chemical Resistance?

When selecting materials for applications exposed to harsh chemicals, it's crucial to choose engineering plastics with superior chemical resistance. Below are five top-performing materials:

1. PEEK (Polyetheretherketone)

PEEK is a high-performance thermoplastic known for its exceptional chemical resistance. It withstands a broad spectrum of chemicals, including acids, bases, and solvents, maintaining its mechanical properties up to 170°C (338°F). PEEK is commonly used in aerospace, automotive, and medical device applications due to its durability and reliability.

2. PTFE (Polytetrafluoroethylene)

PTFE, widely recognized as Teflon®, offers near-universal chemical inertness. It remains non-reactive to virtually all chemicals, including strong acids and bases, due to the strength of carbon-fluorine bonds. PTFE operates effectively across a temperature range from -200°C to 260°C (-328°F to 500°F), making it ideal for applications in chemical processing, aerospace, and semiconductor industries.

3. PPS (Polyphenylene Sulfide)

PPS demonstrates superior performance in acidic conditions compared to many alternatives. Tests in 85% sulfuric acid at 120°C for up to 5000 hours confirmed PPS outperforms even PTFE and PVDF in extreme acidic environments. Approximately 50% of PPS production serves automotive components, including brake, coolant, fuel systems, and powertrain applications.

4. PVDF (Polyvinylidene Fluoride)

PVDF exhibits excellent chemical resistance to ozone exposure and maintains stability under UV radiation. With a tensile strength of 35-55 MPa (5,000-8,000 psi), this semi-crystalline thermoplastic operates effectively from -20°C to +130°C. PVDF resists most mineral acids, including hydrofluoric acid, but remains vulnerable to esters, ketones, and strongly basic solutions.

5. UHMW (Ultra-High Molecular Weight Polyethylene)

UHMW provides cost-effective chemical resistance. Its unique crystalline structure resists most acids, bases, and solvents without swelling or degradation. UHMW meets FDA, USDA, and 3-A Dairy guidelines, making it ideal for food processing applications.

Conclusion

Selecting the appropriate engineering plastic with superior chemical resistance is essential for ensuring the longevity and reliability of components exposed to harsh chemical environments. PEEK, PTFE, PPS, PVDF, and UHMW are among the top materials offering exceptional chemical resistance, each with unique properties suited to specific applications. Consider the specific requirements of your application, including chemical exposure, temperature range, and mechanical stresses, to make an informed material selection.

Bost's Advantages

Bost offers a comprehensive range of engineering plastics, including PEEK, PTFE, PPS, PVDF, and UHMW, ensuring high-quality materials tailored to your specific needs. With a commitment to innovation and customer satisfaction, Bost provides expert guidance and reliable solutions for your material selection process.