About the Project
This project partnered with a renowned high-end consumer electronics brand based in Europe and the Americas—an industry leader known for premium textures, environmental sustainability, and strict quality standards.
The brand aimed to launch a flagship phone case line with three core selling points: integrated injection molding, coating-free high-gloss texture, and dual performance of rigidity and toughness. It needed to meet European and American market demands for mirror-like aesthetics, drop resistance, and compliance with RoHS/REACH/GRS regulations.
Finding the right manufacturing partner was critical. After evaluating multiple Asian manufacturers, the brand chose YG as its exclusive OEM/ODM partner. YG stood out for its 13-year experience in custom phone cases manufacturing, ISO 9001/14001/13485 certifications, GRS-certified eco-material supply chain, and proven track record with top Western brands. It was the only supplier able to meet all requirements—within budget.
| Industry | Consumer Electronics Accessories |
|---|---|
| Product | Custom high-gloss PC/TPU blended phone case |
| Services Provided | Custom plastic mold opening, precision injection molding, mold polishing, quality inspection |
| Technology | Precision mold making, PC/TPU blended injection molding, high-gloss mold polishing |
| Materials | PC/TPU blended alloy (GRS-certified recycled materials optional) |
| Surface Treatments | High-gloss finish via mold polishing (no additional coating) |
The Challenges
The brand’s technical requirements posed unique tests for manufacturing capabilities:
- Material balance: The PC/TPU blended material needed to integrate PC’s rigidity and TPU’s toughness, with precise ratio and injection parameter control to avoid compromising high-gloss quality.
- Coating-free high-gloss effect: Achieving mirror-like texture (Ra ≤0.02μm) solely through mold polishing required flaw-free molding—no flow marks, sink marks, or warping.
- Strict dimensional tolerance: ±0.01mm precision demanded mold design that compensated for PC/TPU’s different shrinkage rates, ensuring consistent batch sizes and perfect phone fit.
- Environmental compliance: Materials had to pass RoHS/REACH testing and hold GRS certification, requiring reliable eco-material supply chains and strict incoming inspections.
“I needed a partner who could master PC/TPU blending and coating-free high-gloss molding, while meeting our standards for precision, compliance, and speed,” said the brand’s product development manager. “Most manufacturers couldn’t balance all three—YG was the only one that checked every box.”
The Solution
YG’s engineering and production team developed a targeted end-to-end solution after thorough design review:
- Comprehensive DFM analysis: Used Moldflow simulation to optimize gate placement and cooling channels, adjusting wall thickness to minimize defects while maintaining structural integrity.
- Mirror-polished precision molds: Adopted high-grade S136 mold steel, combined with high-speed CNC and EDM machining for ±0.005mm mold precision. Diamond polishing achieved Ra ≤0.02μm mirror finish for coating-free high-gloss products.
- Optimized PC/TPU formulation: Selected GRS-certified recycled PC and anti-yellowing TPU, with a 6:4 blending ratio to balance rigidity and toughness. All materials passed third-party RoHS/REACH testing.
- Strict injection process control: Used stable Sumitomo precision injection molding machines, with real-time monitoring of pressure, temperature, and cycle time. Senior technicians performed on-the-spot visual inspections to eliminate surface defects.
- Full-process quality checks: 100% dimensional inspection via CMM, surface gloss/texture testing, and complete batch inspection reports (including dimensional data, material certifications, and compliance results).
“The efficiency and professionalism of YG’s team exceeded our expectations,” the product development manager noted. “Their DFM suggestions optimized our design early on, with on-the-spot inspections ensuring no defective products slipped through—we had full confidence in quality.”
The Results
The collaboration delivered outstanding results that exceeded all key requirements:
- Flawless product quality: Coating-free high-gloss finish with no defects. The PC/TPU blend passed 2-meter drop tests (no damage) and 10,000-cycle wear resistance tests.
- Precision compliance: 99.8% batch pass rate, with all products meeting ±0.01mm dimensional tolerance and seamless phone fit.
- Full environmental compliance: GRS, RoHS, and REACH certifications cleared all European and American market access barriers.
- Ahead-of-schedule delivery: The 42-day completion (3 days early) enabled the brand’s peak season launch.
- Positive market feedback: The phone case became a bestseller in over 20 European and American countries, praised for its “luxurious texture” and “durability.”
- Long-term partnership confirmed: “YG delivered more than a product—they provided a reliable solution for market success,” said the brand’s supply chain director. “Their precision, manual quality control, and efficiency make them irreplaceable.”
Looking Ahead
Building on this success, the European and American brand plans to expand its high-end phone case line—including matte texture, 3D embossed, and MagSafe-integrated models—all to be developed with YG.
YG will continue investing in technical innovation: optimizing PC/TPU blending processes, expanding eco-material options, and upgrading mold polishing technology for even more precise finishes. It will also refine production processes to maintain strict quality control while adapting to complex custom product needs.
