Inside the Micro-Abrasive Blasting Process
How precision control defines coating removal quality
Micro-abrasive blasting (also called micro-blasting) is the foundation of an effective micro-abrasive blasting process for conformal coating removal. It delivers one of the most precise and controllable ways to remove Parylene, acrylic, urethane, and silicone.
Unlike mechanical scraping or chemical stripping, the micro-abrasive blasting process drives a fine stream of dry abrasive particles with compressed air to gently remove microns of material while protecting the board and components.
Below, we break down the variables—media, pressure, nozzle, distance, and ESD control—that govern performance and repeatability.
Understanding the Micro-Abrasive Blasting Process
Micro-abrasion directs fine media particles through a miniature nozzle at low pressure. When the stream strikes the coating, microscopic impacts lift or shear the film. Because the jet is tightly focused—often under a millimetre wide—operators can target exact zones such as test pads, connector edges, or rework sites without disturbing adjacent components. This focus makes the micro-abrasive blasting process ideal for selective removal and controlled exposure.
Advantages of the Micro-Abrasive Blasting Process
Compared with mechanical, thermal, or chemical techniques, precision micro-blasting offers a strong mix of precision, safety, and consistency:
- Precision: Removes only the coating layer—not solder mask or metallisation.
- Control: Tune air pressure, media flow, and angle for repeatable outcomes.
- ESD Safety: Use conductive nozzles and grounded cabinets to protect sensitive electronics.
- Clean Process: Avoid solvents and fumes; dry removal reduces handling hazards.
- Lower Training Burden: Once you set parameters, operators can follow a clear, consistent recipe.
Key Process Variables in Micro-Abrasive Blasting
Successful outcomes depend on four levers within the micro-abrasive blasting process: abrasive media, air pressure, nozzle geometry, and technique. Match each to the coating’s hardness and thickness and to the assembly’s fragility.
Abrasive Media Selection for Precision Coating Removal
The abrasive sets removal aggressiveness. Softer media protect delicate boards; harder media increase throughput on thick films. For delicate conformal films and populated PCBs, VanAcrylic—our engineered acrylic polymer media—delivers a gentle, highly controllable cut with clean visibility and consistent results.
| Abrasive Type | Characteristics | Typical Use |
|---|---|---|
| VanAcrylic (NEW) | Engineered acrylic polymer; gentle, uniform cutting; low risk to solder mask and component bodies; clear cabinet visibility. | Selective removal on populated PCBs, especially thin Parylene and acrylic coatings where surface integrity matters. |
| Plastic Media | Broad working range; controllable cut; multiple sizes for different removal rates. | Thicker or multi-layer coatings; general-purpose conformal coating rework. |
| Walnut Shell | Sharper, fibrous particle with moderate hardness. | Tougher polymer or silicone systems that need more cutting power. |
| Sodium Bicarbonate | Angular, needle-like morphology; soft yet effective on resilient films. | Harder or stubborn coatings; targeted rework on metallic surfaces. |
Air Pressure and Media Flow in the Micro-Blasting Process
Work typically between 40–80 psi (2.7–5.5 bar), depending on the coating. Lower pressures protect components but slow removal; higher pressures speed removal but risk solder mask erosion. Use clean, dry air and stable regulation to keep media flow consistent.
Nozzle Geometry and Control for Consistent Results
The nozzle converts air and media into a coherent stream. Size the internal diameter to roughly four times the average particle size to prevent clogging and maintain uniform flow. For electronics, common sizes sit between 0.018″–0.060″. Choose conductive nozzles to dissipate static and support ESD-safe micro-abrasive blasting.
Technique: Angle, Distance and Motion
Technique drives finish and precision:
- Angle: Use a shallow 20–30° angle to control small, targeted areas.
- Distance: Hold ~6-12 mm (1/4 -1/2″) stand-off to keep cutting power consistent.
- Motion: Sweep evenly to prevent localised erosion.
For large areas, first peel the film from a shallow angle, then reverse the angle to separate the lifted edge cleanly. This two-step technique improves throughput without sacrificing control in the micro-abrasive blasting process.
Process Repeatability and Quality Control
Lock in parameters, then verify them. After you establish the best media, pressure, and angle, reproduce the recipe across boards and operators. Use test coupons or coated sample boards to track removal rate and confirm you preserve solder mask and component surfaces. These controls keep the micro-abrasive blasting process consistent from run to run.
Parylene and Aerospace: Micro-Abrasive Blasting Considerations
Parylene coatings resist chemicals and challenge most removal methods. Precision micro-abrasive blasting provides controlled, dry removal without chemical attack.
In aerospace and defence work, prevent static discharge and trace damage with an ESD-safe cabinet and a grounded operator setup. Because the process targets only where needed—connectors, inspection pads, rework zones—you maintain overall board integrity. Choosing VanAcrylic as the preferred gentle media helps preserve solder mask gloss and component markings while exposing pads cleanly for test or rework.
Integrating ProBlast Systems for the Micro-Abrasive Blasting Process
SCH’s ProBlast micro-abrasive systems give you precise control of media flow, air pressure, and nozzle angle, so you can deliver consistent results across operators and runs. Pair optional ESD-safe configurations, high-visibility cabinets, and adjustable nozzles with VanAcrylic media for predictable flow, low dust, and excellent visibility.
For rapid adoption, our team provides process development and operator training via the Rework & Repair Training programme.
Official Distributor for the Vaniman ProBlast ESD-3
As an authorised UK distributor for Vaniman, SCH supplies and supports the ProBlast ESD-3 for precision conformal coating removal—including Parylene. The platform combines an ESD-safe cabinet, instant foot-pedal control, precision nozzles, and dedicated media tanks to deliver repeatable, board-safe results for aerospace and advanced electronics rework.
Review the full specification on the manufacturer’s site: Master ProBlast 3 – 80060 (Vaniman)
See Pricing, Options & Request a Demo
Explore configurations, media options (including VanAcrylic), ESD-safe setups, and training packages for the ProBlast. Book a live demo, send sample parts, or request a tailored quote.
Why Choose SCH Services?
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