Solder Mask Ink (PCB UV INK)

Description

1. Product Overview

This product is a high-resolution, photo-imageable Solder Mask Ink engineered specifically for printed circuit board (PCB) fabrication. It serves as the permanent protective coating for copper circuitry, preventing oxidation, solder bridging, and dielectric breakdown during assembly and operation. The key value proposition lies in its exceptional adhesion, rapid UV curing, and superior thermal stability—directly translating to lower defect rates and higher first-pass yields for PCB manufacturers. Strategically, as electronics migrate toward miniaturized, high-density interconnect (HDI) designs, this ink provides the critical process reliability required to maintain global competitiveness.

2. Key Specifications & Technical Characteristics

• Chemical Composition: Two-part epoxy acrylate oligomer system with photo-initiators, inorganic fillers (silica/barium sulfate), and adhesion promoters.

• Purity / Grade: Electronic grade; ion contamination (Na⁺, Cl⁻, K⁺) < 1.0 ppm; halogen-free compliant to IEC 61249-2-21.

• Physical Characteristics:

  • Form: Viscous, thixotropic liquid

  • Color: Matte green (standard), other RAL colors available

  • Viscosity (Brookfield, 25°C): 160–220 dPa·s ±10%

  • Particle size (D99): < 5 µm

  • Density: 1.20 – 1.35 g/cm³

• Cured Film Properties:

  • Thickness (dry): 15–25 µm

  • Dielectric strength: > 80 kV/mm

  • Insulation resistance: > 1 × 10¹² Ω (after 85°C/85% RH, 500h)

• Packaging Options: 1 kg sealed HDPE bottles; 5 kg light-blocking pails; 20 kg industrial drums.

• Shelf Life: 12 months from date of manufacture when stored at 20–25°C in original, unopened containers.

3. Core Industrial Applications

• Primary Industries: Consumer electronics PCB fabrication, automotive electronics (including EV power modules), industrial control boards, medical device PCBs, and telecommunications infrastructure.

• Specific Operational Use Cases:

  • HDI & Microvia coverage: Excellent via plugging and tenting for 2–4 mil microvias without bubble entrapment.

  • Fine-pitch SMD assembly: Maintains sharp edge definition down to 75 µm solder dams, preventing tombstoning and bridging.

  • Automotive high-temp environments: Withstands 260°C peak reflow (multiple passes) and continuous operation at 150°C.

• Performance vs. Alternatives: Unlike solvent-based or low-end UV inks, this product exhibits zero photo-speed drift over an 8-hour shift, eliminates tackiness after cure, and resists “haloing” during alkaline developing—reducing rework by up to 30% compared to standard commodity inks.

4. Competitive Advantages

• Quality Consistency: Lot-to-lot viscosity and reactivity variation < 2% (CpK ≥ 1.33), validated by FTIR and rheometry batch records.

• Supply Reliability: Dual-sourced raw material strategy and 90-day safety stock held in regional distribution hubs (Asia, Europe, Americas).

• Logistics Capability: Hazard-class 9 (UN 3082) compliant packaging; ambient-temperature shipping (no cold chain required).

• Price Competitiveness: Direct factory pricing eliminates 2–3 distribution layers—15–20% lower total landed cost vs. equivalent German/Japanese brands.

• Sustainability: MEK-free and glycol-ether-free formulation; low VOC (< 5 g/L); fully compatible with alkaline stripping solutions for reclaimable process waste.

• Technical Support: Full documentation package includes MSDS, TDS, IPC-8402 conformance certificate, and 24-hour engineering support for screen print, spray, or curtain coating lines.

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): 100 kg (palletized mix of packaging sizes)

• BULK 20MT Loading Capacity: 20 metric tons (MT) net weight = 1 standard 20-ft container, utilizing palletized 20 kg drums (1,000 drums total, 4 drums per pallet, 250 pallets, shrink-wrapped and strapped)