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Your Trusted Partner in Plastic Injection Molding & Mold Development
Sung I Industrial Co., Ltd.

Since 1978, Sung I Industrial has been committed to delivering reliable, high-quality solutions from mold development to finished plastic injection molded products. With over 45 years of experience, we serve clients worldwide by providing complete, one-stop services that are precise, efficient, and built for success.
We specialize in vertical integration — combining design, tooling, and production under one roof. Our advanced molding capabilities include insert molding, overmolding, and single-color injection molding. Whether you're looking for full OEM or ODM support, or custom manufacturing solutions, we tailor our services to meet your exact needs.

Why Choose Sung I?

✅ Full-service solutions from mold design to finished plastic products
✅ Skilled team dedicated to custom injection molding
✅ ISO 9001:2008 certified for consistent quality assurance
✅ Fast, cost-effective production to meet competitive global demands
✅ Long-term, trust-based partnerships with global clients

Our Core Services:

• Plastic Injection Molding: Single-color, dual color, overmolding, insert molding
• Mold Development: High-precision mold design & fabrication
• OEM / ODM Solutions: End-to-end support from concept to mass production
• Vertical Integration: Streamlined manufacturing processes
• Custom Manufacturing: Fully tailored solutions for your unique requirements

Whether you're launching a new product or scaling up global production, Sung I is your reliable partner for high-quality, custom plastic solutions.
👉 Contact us today to learn how we can help bring your ideas to life!

🌟 From Design to Delivery — Our Complete Production Process

At Sung I Industrial, we provide a seamless, vertically integrated workflow — from concept to mass production. Here's how we turn your ideas into high-quality plastic injection molded products with speed, precision, and care:

🔧 Production Flow | From Design to Delivery

1. 2D/3D Drawing Review
We receive and evaluate your product's 2D or 3D CAD files.

2. Specification Confirmation
We confirm all technical details including materials, dimensions, tolerances, and performance requirements.

3. Quotation Provided
A detailed quotation is issued including lead time and pricing based on your custom manufacturing needs.

4. Mold Flow Analysis
We perform professional mold flow simulations to optimize mold development and ensure efficient injection performance.

5. Mold Fabrication
Tooling and precision mold machining begins based on approved designs.

6. T1 Sample & Review
The first test samples (T1) are molded and delivered for client review and functional testing.

7. Mold Revisions (If Needed)
We modify the mold if necessary based on feedback and testing results.

8. Mold Finalization
Once approved, the mold is finalized for production.

9. Mass Production
We begin plastic injection molding using a high-efficiency process under OEM / ODM models.

10. Assembly (Optional)
We provide full or partial assembly services depending on project needs.

11. Quality Inspection
Every product goes through strict quality control based on ISO standards.

12. Packaging
Finished parts are professionally packed to meet shipping and protection requirements.

13. Shipping
Global delivery arranged on time with export-ready documentation.

✅ Why This Process Matters

• Full vertical integration = faster turnaround & better quality control
• Precision mold development = fewer revisions, lower cost
• Tailored custom manufacturing for any industry
• Seamless OEM/ODM support from design to delivery
• Trusted by global clients in high-demand markets

Sustainable & Multi-Industry Plastic Injection Molding Solutions

Thanks to the versatility of plastic materials and advanced plastic injection molding technologies, our solutions are widely used across industries requiring high-precision plastic components — including products that comply with CE, UL, FDA, REACH, and RoHS international standards.

At Sung I Industrial Co., Ltd., we combine decades of hands-on experience with a strong commitment to sustainability, delivering custom plastic manufacturing solutions that meet strict quality requirements while minimizing environmental impact.

We actively incorporate PCR (Post-Consumer Recycled) materials and other eco-friendly plastics into production. Through energy-saving practices and carbon footprint tracking, every step of our vertically integrated process is designed to support greener, smarter manufacturing.

At the same time, by integrating recycled material programs, we help customers significantly reduce raw material costs without compromising quality — enabling more cost-effective, competitive products in the market.

Industries We Serve:

• Industrial Equipment
• Automotive Products
• Electronic Devices
• Medical Supplies
• Sporting Goods

Whether your focus is on durability, functionality, or aesthetics, we deliver high-performance and sustainable plastic solutions — built to perform, designed with the planet in mind.
➡️ We also welcome inquiries from other industries — let’s work together to create a more sustainable manufacturing future.