1. Client Challenge: Seeking Long-Term Clarity and Resilience
A leading manufacturer specializing in durable outdoor products was facing significant field failures with their standard epoxy-based label doming materials. The issues included:
- Premature Yellowing: Labels exposed to continuous sunlight showed rapid discoloration, compromising brand aesthetics.
- Cracking and Peeling: Temperature fluctuations and minor physical impacts caused the brittle epoxy dome to crack and lift from the substrate.
The client required a crystal clear, high-gloss coating that could withstand harsh weather and maintain flexibility without sacrificing clarity.
2. FONG YONG Solution: Flexible Polyurethane Resin (EU-118S-5S / HU-118S-5S)
FONG YONG recommended and supplied the EU-118S-5S / HU-118S-5S Flexible Polyurethane Resin. This specialized two-component system was chosen for its distinct advantages over traditional epoxy for doming applications:
- Superior UV Resistance: The formulation is specifically designed with excellent resistance to UV light, drastically slowing down the yellowing process and ensuring long-term aesthetic appeal.
- High Flexibility and Impact Resistance: The cured product achieves a Shore A Hardness of 75-85 while retaining good flexibility and resistance to weather and impact. This prevents cracking during thermal cycling or accidental bending of the label.
- High-Gloss, Water-Proof Finish: The cured resin exhibits a glossy, good water-proof, and oil resistant finish, crucial for outdoor exposure.
3. Implementation and Manufacturing Process
The client utilized the resin with a precise 1:1 mixing ratio by weight for consistency. Key process considerations, as highlighted in the TDS:
- Moisture Control: The dispensing process was carried out in a dehumidified area with relative humidity kept below 50%, as polyurethane resin is moisture sensitive.
- Bubble Management: The mixture was degassed in a vacuum machine to remove initial bubbling. After spreading, a torch was passed over the surface to eliminate any remaining surface bubbles.
- Flexible Heat Curing Protocol: To achieve a perfect, bubble-free cure, the applied objects were immediately put into the oven for heat curing. Recommended cure schedules include 80℃ for 120 minutes, or a lower temperature option of 60℃ - 70℃ for 3-4 hours, depending on production flexibility.
4. Results and Client Benefits
By switching to FONG YONG's PU Doming Resin, the client achieved:
- Zero Yellowing Reports after one year of field testing in high-sunlight conditions.
- 95% Reduction in Label Cracking due to the superior flexibility and good adhesion properties to substrates like plastics and metals.
- Enhanced Brand Perception due to the durable, high-gloss finish.
FONG YONG provides customized, reliable solutions for flat and curved surface coatings where durability and long-term clarity are paramount.
