Pre-penetrant Etch
Achieve accurate FPI results with Element’s Pre-penetrant Etch. Our hands-on, integrated service removes only 0.00005 in of smeared material, ensuring minimal dimensional loss. Requested alongside Fluorescent Penetrant Inspection for a seamless process, we help you uncover hidden flaws without delay. Rely on fast turnarounds, customized solutions, and expert guidance to keep your production running smoothly.
What is Pre-penetrant Etch at Element?
Pre-penetrant etch (pre-pen etch) is a surface preparation process that removes a small, precisely controlled layer of 0.00005 in [0.00125 mm] from machined metal parts prior to Fluorescent Penetrant Inspection (FPI). By clearing away smeared material from operations such as grinding, sanding, abrasive blasting, buffing, reaming, milling, or drilling, we expose potential defects that would otherwise remain hidden. This optional step is often requested alongside FPI at Element for a complete and highly reliable inspection process.
What can element offer you for Pre-penetrant Etch service
Key tests offered
Key tests offered
Element's chemical processes eliminate surface smearing caused by:
- Grinding, sanding, abrasive blasting, buffing
- Reaming, milling, drilling
- Other machining methods that compress or smear surface metal
By removing only 0.00005 in per surface, we ensure minimal dimensional impact while exposing micro-cracks or voids for accurate flaw detection in subsequent Fluorescent Penetrant Inspection.
Components we test
Components we test
Our pre-penetrant etch services accommodate a wide variety of machined metal parts requiring flawless FPI results. From housings and brackets to rod ends and core weldments, we deliver the essential surface prep that reveals underlying flaws without affecting part geometry or mechanical properties.
- Housings, brackets, closures
- Rod ends, actuators, pistons
- Flanges, valve bodies, retainers, yokes
- Balls, bearing plates, core weldments
Methods and solutions offered
Methods and solutions offered
We tailor each pre-pen etch to your component’s metal type and the desired inspection sensitivity:
- Customized cleaning solutions vary by alloy composition
- Precisely calibrated material removal ensures dimension integrity
- Compliant with multiple specs (HS7725, RPS 15.45, C5098, MTV 607-3, SS8712, EIM Code 8, RPS 674, CP3605)
- Integrated with FPI for a seamless inspection workflow
Because different materials require different acid solutions or dwell times, we adjust each process to match your unique part design and industry needs.
Which labs offer this service
Which labs offer this service
Our team operates from Materials Testing hubs worldwide, giving you global access to our expertise. Visit our Locations Page to explore our lab network.
Precision preparation for critical components
Precision preparation for critical components
Surface preparation can make or break the accuracy of FPI. Our pre-penetrant etch method ensures a meticulously prepared surface—removing just enough metal to reveal hidden flaws while preserving part tolerances. When combined with our FPI expertise, you receive a single-source solution for reliable, non-destructive testing.
Standards we test to and components we test
Element maintains approvals and industry certifications for:
- HS7725
- RPS 15.45
- C5098
- MTV 607-3
- SS8712 (swab etch)
- EIM Code 8
- RPS 674 (including swab etch)
- CP3605
(We can also adapt to custom dimensions or specs on request.)
Structural components
- Housings
- Brackets
- Closures
- Flanges
- Core weldments
Mechanical components
- Rod ends
- Actuators
- Pistons
- Valve bodies
- Retainers
- Yokes
- Balls
- Bearing plates
Your Challenges, Our Solutions
Traditional testing missing micro-defects
Meeting all industry standards
Dimensional precision requirements
Streamlining inspection workflow
Why Choose Element
Specialized pre-pen etch expertise
Comprehensive specification coverage
Material-specific surface preparation
Integrated non-destructive testing
Explore our global network of labs and find your nearest location
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