Conformal Coating Viscosity Control

Why Viscosity Matters in Conformal Coating

Effective conformal coating viscosity control is essential for consistent coverage, defect prevention, and long-term PCB reliability. If viscosity is too low, coatings can run or thin out; too high, and you risk bubbles, voids, or poor flow. Managing viscosity is a cornerstone of stable, repeatable coating processes.

Measuring Conformal Coating Viscosity

Accurate viscosity measurement is critical to conformal coating process control.
Using a Zahn cup and stopwatch, operators can monitor and maintain coating
consistency to ensure correct film thickness, reduce defects, and meet IPC standards.

  • Ensures consistent coating flow and application
  • Supports repeatable film thickness and quality
  • Reduces risk of defects such as bubbles, runs, or orange peel
  • Forms part of IPC-compliant process control
Conformal coating viscosity control – Zahn cup measurement with stopwatch for process consistency

Best Practices for Viscosity Control in Conformal Coating

Good control means more than taking a reading—it ties specification limits, trained operators, and verification plans together. Build viscosity into your work instructions and link checks to thickness verification for a closed-loop process.

  • Define viscosity windows per coating and application method
  • Calibrate cups and record readings for traceability (SPC)
  • Use clean containers and consistent sampling technique
  • Correlate viscosity to film build and final performance

SCH Support, Training & Equipment

SCH helps teams implement robust viscosity management—from operator training and process audits to supply of flow cups and accessories. Our specialists optimise coating parameters so you reduce rework, improve yield, and meet customer/industry standards.

  • Training on viscosity measurement and handling
  • Process setup and optimisation consultancy
  • Supply of measurement tools and consumables

Contact SCH to discuss viscosity control solutions →

Download the Technical Bulletin

Prefer the original PDF format of this topic? Download the bulletin here:

📄 Technical Bulletin: Measuring Conformal Coating Viscosity

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 – Specialists in coating technologies trusted by aerospace, medical, defence, automotive, and electronics industries worldwide.
  • 🛠️ End-to-End Support – Guidance on coating selection, Parylene grades, masking strategies, application methods, inspection, and ProShieldESD integration.
  • 📈 Scalable Solutions – From small prototype batches to full-scale, high-volume production, SCH delivers flexible capacity that grows with your needs.
  • 🌍 Global Reach – Responsive technical support and supply coverage across Europe, North America, and Asia.
  • ✅ Proven Reliability – A strong reputation built on quality, consistency, and customer satisfaction across services, equipment, and materials.

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