What Is the Difference Between PSU and PPSU?

Temperature and cost guide selection. PEI offers long-term service up to 170°C (Tg 217°C), inherent flame retardancy, and lower cost than PEEK, ideal for aerospace interiors, electrical insulation, and medical device structural parts. PEEK withstands long-term temperatures up to 250°C with better chemical and wear resistance, suitable for high-heat, corrosive, or implant-grade applications. For temperatures below 170°C, PEI is usually more economical.

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Yes. Acrylic is one of the few plastics that can achieve a mirror finish directly through cutting. We use single-crystal diamond tools for precision machining, followed by flame polishing or diamond grinding. Surface roughness is consistently controlled within Ra0.4μm, delivering a high-gloss appearance free of scratches or defects, resembling a mirror. No secondary coating is required. For batch production, identical parameters are used to ensure consistent mirror finish quality.

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Common choices are PPSU, PSU, PEI, and PEEK. PPSU withstands over 1,000 cycles at 134°C with the best impact resistance; PEI is heat-resistant to 170°C at a lower cost; PEEK has the highest heat tolerance and is suitable for implant-grade applications. PC and ABS are unsuitable for repeated high-pressure sterilization, as they are prone to stress cracking or yellowing after just a few cycles.

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Appearance quality is a core strength. We use a three-stage control process: during machining, sharp tools with high RPM and shallow cuts prevent tool marks and roughness; between processes, all parts are film-wrapped and transferred in individual stations to avoid stacking scratches; before shipping, each piece is inspected under standard light sources against strict criteria for glossy, scratch-free, and blemish-free finishes. Batch consistency is guaranteed by fixed parameters and fixtures, not manual picking.

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PP offers superior rigidity and heat resistance (mp ~160°C) with good chemical resistance and low cost, making it ideal for chemical tanks, flanges, and pump/valve parts. PE is softer, handles extreme cold better (down to -100°C), and has a low friction coefficient; UHMW-PE delivers 7x the wear resistance of carbon steel, suiting conveyor rails and wear liners. Select PP for rigidity/heat and PE for wear/low-temperature performance.

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