Can Plastic and Aluminum Parts Maintain Consistent Aesthetic Quality?

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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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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This is typically caused by excessive cutting heat. Acrylic has low thermal conductivity, so slow feed rates, high speeds, or dull tools cause chips to melt and stick to the tool, resulting in haze and stress-induced whitening. Our approach uses monocrystalline diamond tools with high RPM and small depths of cut, along with air cooling or minimal lubrication to dissipate heat. We leave a 0.05-0.1mm finishing allowance before final machining to prevent heat accumulation on already processed surfaces.

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Yes, but not all plastics can achieve this. Dense, polishable materials such as acrylic, PC, POM, and PEEK, when processed with diamond tooling and polishing, can consistently reach surface roughness below Ra0.4μm, achieving a high-gloss, mirror-like appearance. Glass or carbon fiber-filled grades, due to exposed fibers, can only achieve a matte or satin finish, which we will clarify in advance.

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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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