Description
Standardised Conformal Coating Test Coupons (Witness Coupons)
Standardised aluminium test coupons for conformal coating thickness control, process validation, and repeatable measurement.
These commercially available, industry-standard aluminium test coupons are designed for use as witness coupons during conformal coating application. They are the same coupons used within SCHβs own coating services for process validation, calibration, and thickness verification.
Their use aligns with IPC-A-610 guidance on the use of witness coupons as a reliable reference for conformal coating thickness measurement.
Why use these coupons?
When measuring coating thickness directly on populated PCBs, results are often inconsistent due to:
- Component topography
- Shadowing effects
- Restricted probe access
- Uneven coating build
- Edge effects around components
These flat aluminium coupons eliminate those variables, providing a uniform surface that delivers far more repeatable, accurate, and auditable thickness results.
Compatible measurement systems
These coupons are compatible with:
Place the coupon alongside assemblies during coating (dip, spray, or selective), then measure post-cure to confirm your process is achieving the required film build.
Typical applications
- First article inspection (FAI)
- Process validation trials
- Batch release checks
- Coating equipment qualification
- Operator training
- Audit evidence
- IPC compliance documentation
- R&D and NPI coating development
Key benefits
- Consistent, flat geometry for reliable readings
- Reduces variability versus measurements on populated PCBs
- Suitable for acrylic, urethane, silicone, and parylene coatings
- Supports both liquid coating and parylene processes
- Works with non-destructive thickness measurement systems
- Ideal for quality, engineering, and production teams
Sold in packs of 100.
