Conformal Coating Dipping: Process Controls
Why Choose Conformal Coating Dipping?
Dipping immerses the entire PCB into a conformal coating bath, achieving coverage under components and on complex 3D assemblies. It eliminates overspray, reduces wastage, and can be automated for consistent high-volume production.
Controlling Coating Thickness
- Withdrawal speed: Accurately controlled; slower speeds yield thicker films.
- Viscosity management: Accurate viscosity control ensures predictable thickness; target ±5µm variation on flat coupons.
- Typical range: For acrylics at 200 cps viscosity, a 150 mm/min withdrawal speed achieves 25–50µm film build.
Horizontal Dipping
It is possible to dip PCBs horizontally using systems such as the DS101 Dip Coating System. This approach minimises cost for some assemblies but requires attention to coating flow, board size, masking, and drainage performance.
Monitoring Viscosity
Viscosity is typically checked using a Zahn cup. By measuring flow time, operators can track coating condition accurately and cost-effectively. Frequent checks (once or twice daily) are recommended depending on tank use.
Find out more about the Importance of Viscosity in Process Control here.
Dip Tank Height Control
On systems like the DS101 conformal coating dip machine, a weir edge design maintains constant coating height. A sump below captures excess material, helping to prevent evaporation and contamination.
Advanced Options
- Argon blanket: Protects coatings sensitive to moisture by reducing solvent loss and humidity effects.
- Filtration baskets: Capture debris or cured fragments, preventing pump blockages.
- Fixtures: Allows more accurate dipping and more efficient through.
Best Practices for Dip Coating
- Develop a log of hours, board volumes, and thinner additions to predict viscosity adjustments.
- Check tank conditions whenever the lid is open for extended periods.
- Match dip parameters to coating chemistry (solvent-based, silicone, or water-based).
Need Help with Conformal Coating Dipping?
We supply dip coating systems, subcontract coating services, and training to ensure process control and reliability. Our experts can help optimise your coating line for maximum efficiency.
Why Choose SCH Services?
Partnering with SCH Services means more than just outsourcing — you gain a complete, integrated platform for Conformal Coating, Parylene & ProShieldESD Solutions, alongside equipment, materials, and training, all backed by decades of hands-on expertise.
- ✈️ 25+ Years of Expertise – Trusted across aerospace, medical, defence, automotive, and electronics.
- 🛠️ End-to-End Support – Guidance on coating selection, masking, application, and ProShieldESD integration.
- 📈 Scalable Solutions – From prototypes to high-volume production.
- 🌍 Global Reach – Support and supply across Europe, North America, and Asia.
- ✅ Proven Reliability – Reputation built on quality, consistency, and customer satisfaction.
📞 Call: +44 (0)1226 249019
✉ Email: sales@schservices.com
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