Our Amino Resin Injection Molding Services
Elevate your production with our top-tier Amino Resin Injection Molding services. We specialize in urea-formaldehyde (UF) injection and melamine-formaldehyde (MF) molding, delivering high-quality, heat-resistant, and cost-effective thermoset parts tailored to your industry. From custom prototypes to high-volume production, our ISO-certified facility and expert team ensure precision, durability, and on-time delivery—your trusted partner for all amino plastic injection needs.
What Is Amino Resin Injection Molding?
Amino resin molding is a specialized thermoset injection molding process that uses resins derived from amino compounds (such as urea or melamine) combined with formaldehyde. Unlike thermoplastics, these materials cure permanently under heat and pressure, creating rigid, stable parts ideal for diverse applications.
Two primary types dominate the industry:
- Urea-Formaldehyde (UF) Injection: Cost-effective, with excellent electrical insulation properties. Common in electrical components and low-cost household items.
- Melamine-Formaldehyde (MF) Molding: Boasts high hardness, heat resistance, and food-contact safety. Widely used for tableware, appliance parts, and high-gloss surfaces.
Below is a quick comparison of key characteristics:
| Feature | Urea-Formaldehyde (UF) | Melamine-Formaldehyde (MF) |
| Hardness | Medium (Shore D 70-80) | High (Shore D 85-95) |
| Heat Resistance | Up to 120°C | Up to 200°C |
| Food-Contact Safe | No | Yes (FDA-approved grades) |
| Electrical Insulation | Excellent | Very Good |
| Cost | Low to Medium | Medium to High |
| Common Uses | Electrical switchgear, closure caps | Tableware, appliance knobs, toilet seats |
Our Amino Resin Injection Molding Capabilities
At Yigu Technology, we pride ourselves on versatile, high-performance capabilities that meet the most demanding project requirements. Whether you need small-batch prototypes or large-scale production, our facility is equipped to deliver.
Key Capabilities Overview
| Capability | Details |
| Production Volume | High-volume amino parts: Up to 500,000 units/month; UF molding volume: 300,000 units/month |
| Precision | Tight-tolerance amino parts: As low as ±0.05 mm |
| Customization | Custom amino molding (size, shape, color); insert molding & over-molding amino |
| Tooling | Multi-cavity amino tools (up to 32 cavities); in-house toolroom for quick adjustments |
| Prototyping | Rapid amino resin prototyping: 3-5 day turnaround for samples |
Our melamine production line features 15 state-of-the-art injection machines, each with automated feeding and quality control systems. This setup ensures consistent part quality even at peak production volumes. For complex designs, our insert molding service integrates metal or plastic inserts seamlessly into amino resin parts, reducing assembly time and costs.
The Amino Resin Injection Molding Process
The process of amino resin injection combines heat, pressure, and precise timing to create durable thermoset parts. Unlike thermoplastic molding, it involves a permanent curing step that gives amino parts their unique properties. Below is a step-by-step breakdown:
- Material Preparation: Amino resin (UF/MF) is mixed with fillers (e.g., alpha-cellulose, glass fibers) and pigments (for pigmentable amino grades) to form a homogeneous compound.
- Injection: The compound is injected into a heated mold at high pressure (injection pressure amino: 1000-2500 bar) to fill all cavities.
- Curing: The mold is held at a specific temperature (mold temperature amino: 150-200°C) for a set time (curing time amino: 30-120 seconds) to allow the resin to cure and harden.
- Degassing: A degassing amino mold system removes trapped air, preventing bubbles and ensuring smooth surfaces.
- Demolding: The cured part is removed from the mold. For complex parts, we use compression-injection hybrid technology to improve mold filling and reduce defects.
Typical Thermoset Injection Cycle Times
| Part Complexity | Cycle Time (Seconds) | Curing Time (Seconds) |
| Simple (e.g., buttons) | 40-60 | 30-45 |
| Medium (e.g., appliance knobs) | 60-90 | 45-70 |
| Complex (e.g., electrical switchgear) | 90-150 | 70-120 |
Amino Resin Materials: Grades & Properties
We offer a wide range of amino resin grades to match your application’s needs. Our materials are sourced from sustainable suppliers and meet global standards (e.g., FDA for food contact, UL for electrical safety).
Material Grades & Applications
| Material Grade | Filler Type | Key Properties | Target Applications |
| Food-Grade MF | None (pure) | Food-contact safe, high gloss | Melamine tableware, cosmetic jars |
| Electrical-Grade UF | Glass-filled amino | Excellent insulation, flame-retardant | Electrical switchgear, circuit parts |
| High-Gloss Amino | Pigmentable | Smooth, shiny surface | Toilet seats, appliance panels |
| Low-Formaldehyde Amino | Alpha-cellulose filled | Low VOC emissions, eco-friendly | Household items, children’s products |
| Chemical-Resistant MF | Glass-filled | Resists acids, oils, and solvents | Industrial laminates, automotive parts |
Surface Treatment for Amino Resin Parts
To enhance aesthetics and performance, we offer a variety of surface treatment options for amino resin parts. These treatments improve durability, appearance, and functionality.
| Treatment Type | Benefit | Ideal For |
| Amino Resin Polishing | Creates a mirror-like finish | High-gloss toilet seats, decorative parts |
| Sublimation Printing Amino | Full-color, durable prints | Custom melamine buttons, tableware |
| UV Coating Amino | Adds scratch resistance (anti-scratch amino) | Appliance knobs, high-use parts |
| Texture Etching | Creates non-slip or decorative textures | Tool handles, automotive interior parts |
| Edge-Sealing Amino | Prevents moisture absorption | Outdoor or humid-environment parts |
Advantages of Amino Resin Injection Molding
Choosing thermoset amino resin parts offers numerous benefits over other materials (e.g., thermoplastics, metals). Here’s why it’s a smart choice for your project:
- High Hardness (MF): Melamine parts have a Shore D hardness of 85-95, making them resistant to scratches and impacts—perfect for high-use items like tableware.
- Heat Resistance: Amino parts can withstand temperatures up to 200°C (MF), making them suitable for appliance components near heat sources.
- Electrical Insulation (UF): UF resin provides excellent insulation, meeting UL standards for electrical switchgear and circuit parts.
- Dimensional Stability: Low cure shrink (less than 1%) ensures parts retain their shape even under temperature changes or stress.
- Cost-Effective Thermoset: Compared to other thermosets (e.g., epoxy), amino resins offer lower material and production costs for high-volume runs.
Flame-Retardant Amino: Most grades are naturally flame-retardant, reducing the need for additional additives.
Industry Applications of Amino Resin Parts
Amino resin injection molding serves a wide range of industries, thanks to its versatility and durability. Below are the most common applications:
| Industry | Applications | Material (UF/MF) |
| Household & Kitchen | Tableware, food containers, cutting boards | MF |
| Electrical & Electronics | Switchgear, outlet covers, circuit breakers | UF |
| Automotive | Interior trim, dashboard parts, door handles | MF/UF |
| Appliances | Knobs, control panels, dryer parts | MF |
| Sanitary | Toilet seats, shower handles | MF |
| Cosmetics | Jar lids, compact cases | MF (high-gloss) |
Case Studies: Our Amino Molding Success Stories
We’ve helped clients across industries solve production challenges with our amino resin injection molding services. Here are a few highlights:
Case 1: High-Volume Melamine Dinnerware Set
- Client: A global kitchenware brand.
- Challenge: Need 200,000 units of a 5-piece dinnerware set (plates, bowls, mugs) with custom sublimation printing and food-grade certification.
- Solution: Used food-grade MF resin with sublimation printing amino. Deployed 8-cavity molds to meet the volume target.
- Result: Delivered 200,000 sets in 2 months; 99.5% defect-free rate; FDA certification achieved.
Case 2: Tight-Tolerance UF Switch Housing
- Client: An electrical equipment manufacturer.
- Challenge: Produce switch housings with ±0.05 mm tolerance for seamless assembly with internal components.
- Solution: Used electrical-grade UF resin; optimized mold temperature (180°C) and injection pressure (2200 bar) for precision.
- Result: Met tolerance requirements; assembly time reduced by 30%; UL approval obtained.
Case 3: Cost-Down Amino Molding for Appliance Knobs
- Client: A home appliance company.
- Challenge: Reduce production costs for 100,000 appliance knobs without compromising quality.
- Solution: Switched from pure MF to glass-filled amino (30% glass fiber) to reduce material usage; used multi-cavity (16-cavity) tools.
Result: Cost per unit reduced by 15%; hardness and durability maintained (Shore D 88).
Why Choose Yigu Technology for Amino Resin Injection Molding?
We stand out as a leading provider of amino resin injection molding services for 5 key reasons:
- Expertise: 15+ years of experience in amino resin molding; our engineers specialize in thermoset processes and custom solutions.
- Quality Assurance: ISO 9001-certified amino plant; in-house testing labs ensure parts meet your specs (e.g., hardness, heat resistance).
- One-Stop Service: From design-for-molding support to global logistics—we handle every step of your project.
- Speed: Rapid prototyping (3-5 days) and high-volume production (up to 500k units/month) keep your projects on track.
Sustainability: Sustainable amino sourcing (low-formaldehyde resins, recycled fillers) and energy-efficient machines reduce environmental impact.