Design & Analysis
Engineers review your 3D files, perform DFM analysis if needed, and create detailed process plans.
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Fast & Accurate
Precision Injection Molding
Yijiang Technology offers high-precision injection molding services with a wide range of clamping forces from 50 to 2500 tons. Our modern production workshops, advanced molding equipment, and experienced engineering team ensure high-quality parts for automotive, consumer electronics, new energy, and military applications.
Key Capabilities
- Supports Rapid & Production Molds
- Equipped With Leading Brands Zhen Xiong And Haitian
- Achieves High Precision Up To 0.02 Millimeters
- Provides Complete End-to-End Injection Molding Solutions
Talk to Our Team 
50–2500 tons
Clamping Force
±0.02 mm
Tolerance
500,000+
Production Volume
50 – 250 MPa
Injection Pressure
Injection Molding Process
Plastic Injection Molding
A manufacturing process where resin is heated to a molten state in the barrel, then injected into a mold to form production-grade thermoplastic parts.
Liquid Silicone Rubber (LSR) Molding
A thermoset process where two-component compounds are mixed and cured in a mold with a platinum catalyst to produce final parts.
Overmolding & Insert Molding
A two-step injection process where one material is molded over a second substrate or metal insert to create a single component.
Our Capabilities
Our workshops are equipped with 30+ injection molding machines from top brands like Chuan Hsiung and Haitian, with clamping forces ranging from 50 to 2500 tons.
The extra-large tonnage injection molding machines can mold 100-inch TV housings, produce bumpers and battery trays for traditional and new energy vehicles, and provide injection molding services for military applications.
| Equipment Name | Brand | Tonnage/Model | Quantity |
| Injection Molding Machine | Chen Hsong | 128T / 208T / 328T / 468T | 1 |
| Injection Molding Machine | Chen Hsong | 800T / 1450T / 2500T | 1 |
| Injection Molding Machine | DONGHUA | 320T / 380T / 450T / 1500T | 1 |
| Injection Molding Machine | DONGHUA | 500T / 750T | 2 |
| Injection Molding Machine | Chen Hsong | 1000T | 2 |
| Injection Molding Machine | Haitian | 90T | 2 |
| Injection Molding Machine | Haitian | 120T / 160T / 200T / 320T / 360T / 1200T | 1 |
Zhen Xiong Injection Machine Cluster
Multiple Zhen Xiong injection molding machines (1000–2500 tons)
Materials for Injection Molding
- ABS (Acrylonitrile Butadiene Styrene)
- ASA (Acrylonitrile Styrene Acrylate)
- CA (Cellulose Acetate)
- PCT (Polycyclohexylenedimethylene Terephthalate)
- PPA (Polyphthalamide)
- HDPE (High-Density Polyethylene)
- PP (Polypropylene)
- PC (Polycarbonate)
- PMMA (Polymethyl Methacrylate)
- PA12 (Nylon 12)
- PA6/66 (Nylon 6/66)
- POM (Delrin)
- PTFE (Polytetrafluoroethylene)
- PLA (Polylactic Acid)
- PVC (Polyvinyl Chloride)
- PPS (Polyphenylene Sulfide)
- PI (Vespel)
- PAI (Torlon 4203)
- UPE/UHMW (Ultra-High Molecular Weight Polyethylene)
- PEI (Ultem)
- PE (Polyethylene)
- PS (Polystyrene)
- PET (Polyethylene Terephthalate)
- EVA Foam (Ethylene Vinyl Acetate Foam)
- EPS Foam (Expanded Polystyrene Foam)
- PU Foam (Polyurethane Foam)
- TPE (Thermoplastic Elastomer)
- TPU (Thermoplastic Polyurethane)
- LSR (Liquid Silicone Rubber)
- PVC (Polyvinyl Chloride, Shore A)
- POE (Polyolefin Elastomer)
- MPR (Melt Processed Rubber)
- EPDM (Ethylene Propylene Diene Monomer)
- FKM (Fluoroelastomer)
- PC-ABS (Polycarbonate-ABS)
- PC-PBT (Polycarbonate-PBT)
- PC-PET (Polycarbonate-PET)
- PS-PPE (Polystyrene-Polyphenylene Ether)
- PE-PS (Polyethylene-Polystyrene)
- PE-PP (Polyethylene-Polypropylene)
- PBT-PET (PBT-PET Blend)
Aluminum Alloys
- 6061
- 7075
- 2024
- 5083
Stainless Steel
- 304
- 316
- 17-4
- 15-5
Copper Alloys
- C1100
- C36000
- C17200
Titanium Alloys
- Ti-6Al-4V
- Ti-5Al-2.5Sn
Battery Underbody Shield
Battery Cell Module
Door Inner Trim Panel
Plastic Overmolding Mold
OEM Plastic Injection Parts
Injection Molding Applications Across Industries
Production Steps
Mold Design & Manufacturing
Mold designers create molds using high-precision tooling; rapid or production molds are fabricated accordingly.
Trial & Validation
Initial molding trials are conducted; photos/videos are sent for your confirmation.
Low-Volume Production
Once validated, full production begins using selected materials and molds.
Post-Processing & Quality Inspection
Parts undergo finishing, such as trimming, painting, or screen printing, followed by 100% inspection.
Packaging & Delivery
Finished parts are carefully packaged and shipped through our global logistics network.
SPI & VDI Surface Finishes in Injection Molding
✅ SPI Surface Finishes
The Society of the Plastics Industry (SPI) defines surface finish standards for aesthetic quality. Each SPI grade corresponds to a specific average surface roughness (Ra, in µm) and polishing method.
A – High Gloss / Optical Transparency
High-gloss finishes, ideal for visually appealing or mirror-like surfaces, often used for transparent or polished opaque parts. Requires diamond paste polishing.
| SPI Grade | Description | Polishing Method | Surface Roughness Ra (µm) |
| A-1 | High gloss / optical | #3 diamond paste 6000 grit | 0.012–0.025 |
| A-2 | High gloss / transparent | #6 diamond paste 3000 grit | 0.025–0.05 |
| A-3 | High gloss / transparent | #15 diamond paste 1200 grit | 0.05–0.10 |
B – Semi-Gloss
Moderately polished surfaces for parts where visual appeal is important but not critical. Common for panels and semi-visible surfaces.
| SPI Grade | Description | Method | Ra (µm) |
| B-1 | Fine semi-gloss | 600 sandpaper | 0.05–0.10 |
| B-2 | Medium semi-gloss | 400 sandpaper | 0.10–0.15 |
| B-3 | Coarse semi-gloss | 320 sandpaper | 0.28–0.32 |
C – Matte
Economical, medium-rough surfaces to hide defects and improve grip. Widely used in consumer electronics, household goods, and automotive interiors.
| SPI Grade | Description | Method | Ra (µm) |
| C-1 | Fine matte | 600 sand grit | 0.35–0.40 |
| C-2 | Medium matte | 400 sand grit | 0.45–0.55 |
| C-3 | Coarse matte | 320 sand grit | 0.63–0.70 |
D – Textured
Roughest surfaces with sand-like textures, ideal for tactile parts or parts with visual impact. Often used in industrial and consumer products for grip.
| SPI Grade | Description | Method | Ra (µm) |
| D-1 | Light texture | Dry glass bead #11 | 0.80–1.00 |
| D-2 | Medium texture | Dry oxide #240 | 1.00–2.80 |
| D-3 | Heavy texture | Dry oxide #24 | 3.20–18.0 |
✅ VDI Surface Finishes
| VDI Grade | Roughness | Typical Use |
| 10–15 | Very fine | Optical or cosmetic parts |
| 20–25 | Fine | Consumer products, panels |
| 30–35 | Medium | Functional surfaces, grips |
| 40–45 | Coarse | Industrial or textured parts |
| 50+ | Very coarse | Heavy-duty or decorative textures |
What Makes Our Injection Molding Different?
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Resources and FAQs
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What types of parts can be injection molded?
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Injection molding is suitable for plastic and rubber parts of various sizes and complexities, including single-color, multi-color, and overmolded components.
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What materials are supported?
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We support a wide range of engineering plastics, elastomers, and specialty polymers. Custom material selection is also available.
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What is the typical lead time for production?
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Prototype parts can be ready within days, while small- to medium-volume production typically takes 2–6 weeks.
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How do you ensure part accuracy and quality?
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We use high-precision molds, CNC-machined inserts, and rigorous quality control checks to ensure tight tolerances.
Start Your Project Inquiry
Your information is kept confidential and reviewed directly by our engineering team. We typically respond within 1 business day with practical technical feedback.
