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| Brand Name: | DuxPCB |
| Model Number: | PCB Solder Mask |
| MOQ: | 1 pcs |
| Price: | Negotiable / Based on layer and complexity |
| Delivery Time: | 3–5 days for prototype, 7–10 days for mass production |
| Payment Terms: | MoneyGram,Western Union,T/T,D/P,D/A,L/C |
PCB Solder Mask | HDI & Class 3 | Aerospace & Medical Defense | DuxPCB
Overview of PCB Solder Mask
In high-reliability electronics, the PCB solder mask is more than just a protective green coating; it is a critical dielectric barrier that prevents solder bridging in fine-pitch SMT components and shields copper traces from oxidation. For HDI (High-Density Interconnect) and IPC Class 3 boards, DuxPCB utilizes advanced Liquid Photoimageable (LPI) solder resists to ensure precise registration and insulation. Our processes are engineered to support the demanding requirements of the aerospace, medical, and defense sectors, where zero-defect manufacturing is the baseline.
Solder Mask Registration & Precision for HDI
Modern high-speed designs require ultra-fine solder mask dams to isolate closely spaced pads without compromising the solderable area. DuxPCB achieves registration tolerances as low as +/- 1 mil, ensuring that even the most complex BGA and QFN footprints remain free of solder dams on pads. Our vacuum-sealed coating process eliminates air bubbles and ensures 100% coverage on trace edges, which is vital for preventing electrochemical migration in harsh environments.
LPI vs. Dry Film for High-Reliability Missions
While dry film solder masks offer uniformity for planar surfaces, LPI (Liquid Photoimageable) remains the gold standard for boards with high-aspect-ratio vias and complex surface topography. DuxPCB leverages LPI technology to provide superior adhesion to exotic materials and ensure that via-in-pad (VIPPO) structures are properly tented or plugged. This thermal and chemical resistance is essential for boards undergoing multiple reflow cycles or operating in high-vibration aerospace systems.
Technical Capability Table
| Property | Epoxy-based | Acrylic-based | Urethane-based |
|---|---|---|---|
| Adhesion | Excellent | Good | Very Good |
| Chemical Resistance | Excellent | Good | Very Good |
| Flexibility | Low | Excellent | Good |
| Thermal Resistance | High | Moderate | High |
| Dielectric Strength | High | Moderate | High |
| Features | Open Solder Mask Dams | Shadow Masked Solder Dams | Circular Solder Mask Dam |
|---|---|---|---|
| Difficulty | Simple | Moderately Complex | Complex |
| Solder Protection | Basic Protection | Higher Protection | Maximum Protection |
| Applicable Component Density | Normal PCB or Wide Pitch | Closely Spaced Components, High Density PCBs | Fine Pitch Components, Complex High Pin Count |
| Finish Copper Weight | Green Mask Dam | Other Color Mask Dam |
|---|---|---|
| Finish copper ≤ 1oz | 4mil | 5mil |
| Finish copper ≤ 2oz | 7mil | 9mil |
| Attribute | DuxPCB Capability Specification |
|---|---|
| Solder Mask Brands | KSM-S6189, Taiyo PSR-4000 G23K (Green), ABQ RS-2000 V-5 (Purple) |
| Solder Mask Colors | Green, Yellow, Black, Blue, Red, White, Orange, Purple, Pink, Matte Green, Matte Black |
| Solder Mask Cover Trace | 2mil (Allow partly 1.5mil) |
| Solder Mask Thickness | Max: 25um (Double print); Standard: 10-18um (Single print) |
| Trace Edge Coverage | ≥ 5um |
| Max Via Size for Plug | 0.5mm |
Why Partner with DuxPCB?
Engineering FAQs
What is the minimum solder mask dam DuxPCB can achieve? For standard 1oz copper, we can maintain a 4mil green solder mask dam. For higher copper weights or different colors, the dam requirement increases slightly to maintain structural integrity.
How do you ensure solder mask coverage on trace edges? We utilize double-print cycles for high-reliability boards to ensure the thickness at the trace edge is ≥ 5um, preventing exposure and potential shorting.
Can DuxPCB provide specific matte finishes for optical applications? Yes, we offer matte green and matte black finishes to reduce light reflection, which is critical for sensor-based medical and industrial equipment.
For mission-critical PCB fabrication, submit your Gerber files today for a comprehensive DFM review and high-precision solder mask application.
