Introduction to RoHS-Compliant Screen Printing Inks
The global electronics industry is increasingly prioritizing environmental compliance, with RoHS (Restriction of Hazardous Substances) regulations setting the benchmark for safe material usage. RoHS-compliant screen printing inks are essential for manufacturers aiming to meet international standards, particularly for applications in PCB assembly, consumer electronics, and industrial equipment . These inks must exclude restricted substances like lead, mercury, cadmium, and hexavalent chromium, ensuring both safety and durability .
As a leader in UV radiation-cured chemicals, U-Sunny Technology (Shenzhen) Co., Ltd. has developed HM-101, a cutting-edge PBA (Prussian Blue Analogue) monomer-based screen printing ink that combines RoHS compliance with exceptional performance.
Why HM-101 Stands Out in the Market
1. RoHS Compliance with Advanced Formulation
HM-101 adheres to strict RoHS guidelines, eliminating hazardous substances while maintaining superior print quality. Its solvent-based formulation ensures compatibility with rigid plastics (e.g., polycarbonate, treated polyester) and metals, making it ideal for high-precision applications like membrane switches, automotive components, and industrial labels .
Key features:
Zero NVP (N-Vinyl Pyrrolidone): Safe for prolonged use in consumer-facing products.
High adhesion and scratch resistance: Withstands harsh environments, including UV exposure and chemical contact.
Low VOC emissions: Aligns with global sustainability goals .
2. PBA Monomer Technology for Enhanced Conductivity
HM-101 leverages PBA monomer chemistry, a breakthrough in conductive ink development. PBA's unique crystalline structure enables efficient electron transfer, making the ink suitable for:
Printed electronics: Flexible circuits, RFID tags, and touch panels.
Energy storage: Electrodes for sodium-ion batteries (though PBA's industrial scalability remains a focus area) .
This innovation positions HM-101 as a versatile solution for next-generation applications requiring both conductivity and eco-compliance.
Technical Advantages of HM-101
| Property | Specification | Industry Benchmark |
|---|---|---|
| Viscosity (25°C) | 150 dPa·s | 120–180 dPa·s |
| Curing Time | 3–6 minutes at 80–120°C | 5–10 minutes |
| Adhesion (ITO film) | 100/100 cross-cut test | 90–95/100 |
| Alkali Resistance | Full dissolution in 3% NaOH (40°C/6s) | Partial resistance |
| RoHS Certification | Compliant (Pb, Hg, Cd, Cr⁶+ < 0.1%) | Basic compliance |
Data sourced from U-Sunny's HM-101 product specifications and independent lab tests .
Applications Across Industries
HM-101's adaptability makes it a top choice for:
PCB Manufacturing: ENIG (Electroless Nickel Immersion Gold) surface finishes require RoHS-compliant inks to prevent oxidation and ensure solderability .
Consumer Electronics: Screen-printed logos, capacitive touch panels, and UV-cured decorative layers.
Automotive: Durable labels, dashboard components, and anti-corrosion coatings.
Packaging: High-gloss UV inks for cosmetic containers and food-safe packaging .
U-Sunny's Commitment to Innovation
As a certified supplier of UV resins and monomers, U-Sunny integrates 100+ patented technologies into HM-101, including:
Cationic UV curing: Faster curing times and reduced energy consumption.
Thermal initiators: Enhanced stability for high-temperature processes.
Global supply chain: Serving 20+ countries with localized technical support .
The company's R&D focus on green chemistry ensures HM-101 aligns with circular economy principles, minimizing waste and enabling recyclability.