Chemical polishing for micro-bore capillary interiors — down to 0.2mm ID, where electropolishing cannot reach
Electropolishing (EP) requires an electrode inside the workpiece. Mechanical polishing (MP) reduces roughness but leaves the surface chemistry unchanged. For 0.2mm ID capillary tubing and bellows interiors, neither method works. KAMEHA is a technical trading company specializing in chemical polishing (CP) of ultra-fine and geometrically complex internal surfaces. Because CP works wherever the chemistry reaches, we developed our own dedicated equipment to apply it to bores that other methods cannot access. Features ■ Internal surfaces down to 0.2mm ID (capillary tubing) ■ Bellows and other complex geometries where electrodes cannot be inserted ■ Internal surface roughness: Ra 0.17µm (measured) ■ Improved Cr/Fe ratio for enhanced corrosion resistance — an effect mechanical polishing cannot produce ■ Material: SUS316L (VIM+VAR double vacuum melted) ■ 11-step in-house process, from ultrasonic degreasing through chemical polishing, passivation, multi-stage rinsing, and cleanroom packaging ■ Contract polishing available for customer-supplied parts Please download the PDF or contact us for details.
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basic information
Material ■ SUS316L (VIM+VAR double vacuum melted) Dimensions ■ Inner diameter (ID): 0.2 – 1.0mm ■ Wall thickness: 0.05 – 0.1mm ■ Representative spec: OD 0.4mm × ID 0.2mm × L 100mm ■ Length: 25 – 100mm for 0.2mm ID (custom lengths available) Internal surface quality ■ Surface roughness: Ra 0.17µm (measured by laser microscope) ■ Finish grades: Standard UHP / Super UHP ■ Surface chemistry analysis available through third-party laboratories (RJ Lee Group, USA — SEMI-referenced methods) Process ■ 11 steps in-house: ultrasonic degreasing → chemical polishing → passivation → multi-stage rinsing → nitrogen drying → cleanroom packaging Tolerances are set individually according to application. Please contact us with your requirements.
Price information
Quoted per piece or per lot. Pricing depends on ID, wall thickness, length, and quantity — please send us these details for a quotation. Prototype quantities and physical samples are available on request.
Delivery Time
※Lead time depends on specification and quantity. We also accept prototype and small-lot inquiries — please feel free to contact us.
Applications/Examples of results
Geometries and conditions we handle ■ Internal surfaces of micro-bore tubing around 0.2mm ID ■ Bellows and other complex interiors where electrodes cannot be inserted ■ Flow-path components where the work-affected layer and embedded contamination from mechanical polishing are a concern ■ Internal surfaces requiring improved Cr/Fe ratio and cleanliness for UHP environments Target application fields ■ Semiconductor equipment: UHP gas and liquid lines, mass flow controllers, pressure and flow sensor connections ■ Analytical instruments: chromatography and mass spectrometry micro-flow lines ■ Medical and diagnostic devices: micro-flow components for clinical and immunoassay analyzers Contract polishing We also process customer-supplied parts. Send us a drawing and we will tell you whether we can polish it.
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Company information
Our company specializes in the research, development, manufacturing, and sales of ultra-high purity stainless steel microcapillary tubes, fittings for semiconductor manufacturing equipment, and precision parts. We also provide empty chromatography column tubes for analytical instruments and related accessories. Our products are widely used in the medical, biopharmaceutical, semiconductor, aerospace, and analytical instrument industries.
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