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 readingβ€”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 managementβ€”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 β†’

Download the Technical Bulletin

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

πŸ“„ Technical Bulletin: Measuring Conformal Coating Viscosity

Why Choose SCH Services?

Partnering with SCH Services means more than just outsourcing β€” 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.
  • πŸ› οΈ End-to-End Support – Guidance on coating selection, Parylene grades, masking strategies, application methods, inspection, and ProShieldESD integration.
  • πŸ“ˆ 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.
  • βœ… Proven Reliability – A strong reputation built on quality, consistency, and customer satisfaction across services, equipment, and materials.

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Note: This article provides general technical guidance only. Final design, safety, and compliance decisions must be verified by the product manufacturer and validated against the applicable standards.