Dispensing Methods Comparison
Compare jetting valves, contact dispensing, and spray coating methods for conformal coating and precision adhesive dispensing applications.
Quick Summary
TL;DR: Jetting for precision and selective coating, Contact for high-viscosity materials, Spray for full-board coverage.
Choose Jetting Valves if: Need precision spot coating (±50μm), selective area coating, zero waste dispensing, conformal coating keep-out areas, or 50-90% material savings.
Choose Contact Dispensing if: High-viscosity materials (100K+ cP), potting compounds, underfill, dam-and-fill applications, or complex 3D bead patterns.
Choose Spray Coating if: Full-board coverage required, high-volume production, simple boards without selective coating, or established spray process.
Detailed Comparison Table
| Feature | Jetting Valves | Contact Dispensing | Spray Coating |
|---|---|---|---|
| Precision | Excellent (±50μm placement) | Good (±100μm with needle) | Poor (overspray issues) |
| Material Waste | Minimal (50-90% reduction) | Low (only what's dispensed) | High (overspray, masking) |
| Part Contact | Non-contact (no damage risk) | Contact (may damage delicate) | Non-contact (requires masking) |
| Selective Coating | Excellent (programmable areas) | Good (programmable paths) | Limited (requires masking) |
| Coating Thickness Control | Precise (±5μm per pass) | Good (needle height control) | Variable (operator dependent) |
| Viscosity Range | 1 - 100,000 cP (wide range) | 1,000 - 1M+ cP (very high) | 10 - 5,000 cP (limited) |
| Speed | Fast (1,000+ dots/sec) | Medium (path speed limited) | Very fast (full area) |
| Setup/Changeover Time | Minutes (program change) | 15-30 min (needle change) | 30-60 min (masking setup) |
| Material Compatibility | Most conformal coatings, adhesives | All materials (potting, underfill) | Low-viscosity coatings only |
| Automation Level | Fully automated (robot/gantry) | Fully automated (robot/gantry) | Manual to semi-automated |
| Cost Level | Medium-High ($40K - $150K) | Medium ($20K - $80K) | Low-Medium ($5K - $40K) |
| Best Applications | Selective coating, fine-pitch, keep-out areas | Potting, underfill, dam-and-fill | Full-board coating, simple boards |
When to Choose Each Method
Choose Jetting Valves If:
- ✓Selective conformal coating with keep-out areas around connectors
- ✓Fine-pitch components requiring precision placement (±50μm)
- ✓Need 50-90% material savings vs spray coating
- ✓Non-contact dispensing essential (delicate components)
- ✓High-mix production with frequent product changeovers
- ✓Want to eliminate masking and reduce processing time
- ✓Dot, line, or area dispensing patterns with precise control
Choose Contact Dispensing If:
- ✓High-viscosity materials (potting compounds 100K+ cP)
- ✓Underfill applications for BGA and flip-chip devices
- ✓Dam-and-fill processes requiring complex 3D bead patterns
- ✓Thermal interface materials (TIM) for heat sink attachment
- ✓Gasket or sealant dispensing with controlled bead height
- ✓Budget constraints favor lower-cost contact systems
Choose Spray Coating If:
- ✓Full-board conformal coating coverage required
- ✓Simple boards with minimal or no keep-out areas
- ✓Very high-volume production (1000+ boards/day)
- ✓Established spray process already in place
- ✓Lowest initial equipment investment priority
- ✓Material waste not a primary concern
Key Advantages of Jetting Technology
Material Savings
Jetting valves deliver 50-90% material savings compared to spray coating by eliminating overspray and only applying coating exactly where needed.
ROI typically achieved in 6-18 months from material cost reduction alone, not including labor savings from eliminating masking.
No Masking Required
Eliminate time-consuming masking processes. Program keep-out areas digitally and change instantly between product variants.
Reduce processing time by 40-60% and eliminate masking material waste and labor costs.
Precision Placement
±50μm placement accuracy enables coating around fine-pitch components (0.4mm pitch BGAs) and tight connector areas.
Consistent droplet volume (±2%) ensures uniform coating thickness and quality across production runs.
Fast Changeover
Switch between products in minutes with program changes - no physical tooling or masking setup required.
Ideal for high-mix manufacturing environments with frequent product changes and short production runs.
Ready to Reduce Material Waste?
Contact us to learn how jetting technology can save 50-90% on coating materials and eliminate masking processes.