Advanced Electropolishing
For Nuclear, Defence, Aerospace & Medical. Ra ≤ 0.05 µm mirror finish, Cr/Fe controlled passivation, def-grade documentation.
- Ra ≤ 0.05 µm mirror-grade EP
- Cr/Fe > 2.5 — passivation verified
- Custom OD, WT and alloy support
- Full EP bath log & surface data pack
rensa Edge
Advanced Electropolishing Services
Precision EP for tubes, fittings and fabricated components — from standard process finishes to ultra-mirror defence-grade surfaces. Standards: DEF STAN · AMS 2700 · ASTM B912 · ISO 15730.
Applications
Industries & Applications
Nuclear
Corrosion-resistant surfaces for coolant and utility circuits.
Defence
DEF STAN compliant EP for weapons, hydraulics & critical parts.
Aerospace
Mirror-finish EP for fuel systems, hydraulics and actuation.
Medical
High-purity EP surfaces for surgical-grade implant components.
Petrochem
Corrosion & fouling resistance for high-pressure process lines.
Surface Finish Grades
Electropolishing Grade Reference
All grades are profilometer-verified and Cr/Fe tested. Custom Ra targets available on request.
| Grade | Ra Target | Cr/Fe Ratio | Passivation | Typical Application |
|---|---|---|---|---|
| EP Standard | ≤ 0.38 µm | > 1.5 | Standard | Pharma, food & general process |
| EP High | ≤ 0.25 µm | > 2.0 | Enhanced | Semiconductor, high-purity gas |
| Mirror EP | ≤ 0.10 µm | > 2.5 | Premium | Aerospace, medical, defence |
| Ultra Mirror | ≤ 0.05 µm | > 2.5+ | Custom | Nuclear, extreme-purity lab |
Our Process
Six-Stage EP Process
Controlled from pre-treatment through to final documentation — every parameter logged.
Pre-Treatment
Component cleaning, degreasing and surface conditioning to remove contamination before EP.
Electropolishing
Precision-controlled bath chemistry — current density, temperature and time logged for every batch.
Ra / Rz Measurement
Surface roughness verified with calibrated stylus profilometer per component or batch sample.
Cr/Fe Verification
Oxide layer chemistry tested by XPS/AES — Cr/Fe ratio recorded against target spec.
Passivation
Citric or nitric passivation to specification, with soak time and concentration logged.
Documentation Pack
EP bath log, Ra/Rz data, Cr/Fe ratio, passivation record and visual inspection report compiled.
Quality Assurance
EP Quality & Traceability
Every rensa Edge batch is subject to six QA checkpoints — from bath chemistry to passivation verification.
Profilometry Ra / Rz
Calibrated stylus profilometer — results recorded per component / batch sample against agreed target spec.
EP Bath Chemistry
Phosphoric-sulphuric bath composition, current density, temperature and immersion time logged per batch.
Cr/Fe Oxide Ratio
XPS analysis for high-grade and mirror EP — Cr/Fe > 2.5 achieved and documented for defence-grade parts.
Passivation Verification
Passivation confirmed by copper sulphate test or high-humidity test per ASTM A967 / ISO 16048.
Full EP Data Pack
Bath log, Ra/Rz report, Cr/Fe record, passivation cert and visual inspection report shipped with every order.
Defence QA Compliance
Process documents formatted to DEF STAN, AMS 2700 and customer-specific QA plan requirements.
Every rensa Edge order ships with a full EP data pack — bath log, Ra/Rz data, Cr/Fe ratio, passivation certificate and visual inspection report.
Capabilities
What We Electropolish
Tubes & Pipes
- Straight lengths
- U-bends & coils
- Custom OD / WT
- ID & OD simultaneous EP
Fittings
- Elbows, tees, reducers
- Flanges & blind flanges
- Clamp ferrules
- Valve bodies
Fabricated Parts
- Manifolds & headers
- Pressure vessels
- Heat exchanger tubes
- Instrumentation bodies
Defence / Aero
- Hydraulic actuator bodies
- Fuel system components
- Nuclear coolant parts
- Custom alloy components
Materials
Alloys We Process
Most common — pharma, food & general
Low-S controlled for WFI & UHP
Food, beverage & general process
Marine & high-chloride environments
Corrosive chemical & nuclear service
High-temperature & aerospace
Medical & highly corrosive media
Contact us for feasibility review
Request an EP qualification package
Submit your Ra target, alloy, component geometry and standard — we'll confirm feasibility and provide a full EP data pack for your qualification process.