English
Customer Challenge
A fast-growing electronics manufacturer producing optical sensors, quantum dot display modules, NTC temperature sensors and lithium battery packs faced a common bottleneck: finding reliable, process-friendly encapsulation and sealing materials for four very different applications. Each production line demanded a UV-curable adhesive with specific optical, mechanical and environmental performance, and the customer needed one trusted supplier capable of delivering consistent quality across all of them.
Our Solution
After a detailed review of the customer's substrates, curing equipment and reliability requirements, our engineering team recommended a tailored portfolio of four UV cure adhesives, each formulated for the specific application:
| Application | Recommended Product | Key Properties |
|---|---|---|
| Optical sensor & LED light blocking | 3702 Black UV Cure Adhesive | High OD light blocking, 73D hardness, reworkable, boil resistant |
| Quantum dot enhancement film sealing | 3707 Transparent UV Sealant | QD compatibility, moisture-oxygen barrier, thermal shock resistant |
| NTC thermistor & FPC protection | 3766 Amber UV Sealant | 50A low hardness, flexible, high adhesion to FPC and metal |
| Battery sealing | 3767 Amber UV Adhesive | Ultra-fast cure at 600 mJ/cm2, 70D, chemical & aging resistant |
Why These Products Were Selected
- 3702 was chosen for camera and optical sensor modules where stray light must be completely eliminated. Its high OD value blocks light effectively, while excellent surface and deep curing ensure thorough cross-linking. The 73D hardness combined with high toughness and reworkability gives assemblers confidence during final inspection and repair.
- 3707 was developed for quantum dot enhancement film encapsulation. Its superior moisture and oxygen barrier performance protects sensitive quantum dots from degradation, while excellent high temperature, high humidity and cold-hot shock resistance keep displays stable throughout their service life.
- 3766 answered the NTC sensor line's need for a soft, stress-free seal. With only 50A hardness and outstanding flexibility, it withstands repeated bending of FPC assemblies and bonds strongly to both flexible circuits and metal terminals, delivering reliable moisture and aging resistance.
- 3767 was deployed on the battery sealing line, where ultra-fast curing at just 600 mJ/cm2 maximized throughput. Its high flexibility accommodates thermal expansion, high bond strength secures housings, and a dielectric strength of 23 kV/mm provides reliable electrical insulation.
Results & Benefits
- Faster production cycles: All four adhesives cure in seconds under standard UV sources, removing long oven-curing wait times from the customer's processes.
- Higher yield and fewer rejects: Consistent curing behavior and reworkable options (3702) reduced assembly defects and scrapped components.
- Long-term reliability: Each product passed the customer's damp heat, thermal shock and aging tests, supporting 5-year warranty requirements for automotive and consumer electronics.
- Simplified supply chain: One supplier, one quality system and four proven formulations replaced multiple vendors and simplified incoming inspection and inventory management.
- Process flexibility: Viscosities from 700 to 10,000 mPa.s supported spray, dispensing, dam-and-fill and manual application methods across the customer's lines.
Customer Feedback
"The four UV adhesives from this series gave us a single-source solution for applications we previously struggled with. The technical support during validation was outstanding, and the consistency of every batch has made our production planning much easier." - Production Engineering Manager
Conclusion
Whether the task is optical shielding, quantum dot protection, sensor encapsulation or battery sealing, a properly selected UV cure adhesive can transform production efficiency and product reliability. This project demonstrates how a structured portfolio approach - matching hardness, viscosity, curing energy and environmental resistance to each application - delivers measurable results for electronics manufacturers.
Contact our team today to discuss your encapsulation and sealing challenges. We will help you select or develop the right UV adhesive formulation for your production line.