What is EPISPIRE

Solvay’s EPISPIRE PSU EP-340 is an unfilled polysulfone material that delivers a rare balance of transparency, strength, and thermal stability. With its resistance to heat, low distortion under stress, and reliable optical clarity, it has become a trusted choice across electronics, automotive, medical, and optical industries.

01 | Key Material Features

Optical Reliability

EP-340 provides stable light transmission with controlled haze, enabling its use in transparent housings, viewing windows, and optical components.

Heat Resistance

The material withstands continuous service at temperatures above 250 ℃ while maintaining rigidity and strength.

Mechanical Integrity

Its tensile and flexural strength, combined with solid impact resistance, outperform many standard engineering plastics.

Dimensional Precision

Low shrinkage and minimal water absorption allow molded parts to retain tight tolerances even in demanding environments.

Processing Adaptability

A balanced melt index supports both injection and extrusion molding, making the grade well suited for automated, large-scale production.

02 | Typical Applications

Electronics & Electrical: Insulation parts, transparent covers, high-heat component housings.

Medical Devices: Transparent casings and sterilizable parts that withstand repeated autoclaving.

Automotive: Heat- and UV-resistant lampshades, sensor housings, and protective shells.

Optical Systems: Filters, detection modules, and light-transmitting protective panels.

03 | Processing Notes

EP-340 offers smooth melt flow and consistent filling, which minimizes stress-related defects in transparent parts. For medical or optical applications, precise temperature management ensures clarity and surface quality. When components are exposed to long-term heat, staged annealing is recommended to improve dimensional stability. The material’s low moisture uptake further reduces risks of warpage during post-processing.

04 | EPISPIRE PSU EP-340 Data Sheet

05 | Advantages Over Alternatives

  ・Combines optical clarity with mechanical and thermal stability, a rare property set among engineering plastics.

  ・Can substitute higher-cost polymers such as PEI or PPSU when cost-performance balance is critical.

  ・Proven record in both medical and electrical industries, backed by extensive testing and user validation.

06 | Industry Feedback

Medical sector: Transparent housings remain clear and stable even after repeated sterilization.

Automotive users: Good transparency retention under heat and UV exposure, lowering replacement frequency.

07 | FAQs

Q1: How does EP-340 differ from PPSU?
PPSU offers higher impact toughness, while EP-340 stands out for its cost advantage, processability, and optical clarity.

Q2: Can it replace PC (polycarbonate)?
Yes, especially in high-temperature or sterilization environments where PC tends to fall short, though cost is higher than PC.

Q3: Is EP-340 suitable for food contact?
Certain certified grades are available for use in water-handling and food-contact parts. Compliance must be confirmed against specific local regulations.

08 | Recommended Alternatives

Customers may also consider other polysulfone and polyarylsulfone grades for different balances of toughness, optical clarity, or cost.

09 | Why Source from Juyuan?

With 24 years of experience in global plastics trade, Juyuan ensures:

  ・Fast Fulfillment – Ready stock shortens delivery lead times.

  ・Model Selection Expertise – Guidance across multiple PSU and related grades.

  ・Global Supply Network – Reliable sourcing from established manufacturers worldwide.

  ・Technical Support – Help with processing challenges, certification, and design optimization.

By choosing Juyuan, customers secure not only EPISPIRE PSU EP-340 supply but also a dependable partner for long-term success.

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