High-Precision Hot Runner Injection Molds
Engineered by GBM: Trusted by Global Tier-1 Automotive Suppliers for complex, high-volume production utilizing Multi-Cavity layouts with ±0.01mm tolerance.
- 16+ Years of Engineering Excellence
- 98% On-Time T1 Sample Delivery Rate
- 40+ Machines High-Precision Fanuc & Makino
- 500+ Projects Delivered to Global OEMs
What is a Hot Runner System?
Think of a hot runner system as a “Heated Highway” for your plastic. Unlike cold runners that create solid scrap during every cycle, our system uses an internal heated Manifold System and precise Nozzles to maintain optimal Melt Flow to keep the resin molten continuously. It delivers material directly to the mold cavity—ensuring you manufacture products, not waste.
Zero Material Waste
Eliminates the need to trim, recycle, or throw away solid runners. Ideal for expensive Engineering Resins like PEEK and PPS, ensuring 100% usage of Virgin Material.
Faster Cycle Times
No waiting for thick runners to cool down. The mold opens as soon as the part is frozen, boosting daily output.
Superior Part Quality
Delivers resin at lower injection pressure, Minimizes Flow Lines and Weld Lines while eliminating Gate Vestige for superior aesthetics on complex parts.
Why Switch to Hot Runner Systems?
Stop Paying for Waste. In traditional cold runner molding, up to 50% of your material cost can be wasted in runners and sprues. With GBM’s Hot Runner solutions, the molten plastic is kept hot in the manifold, injecting directly into the cavity.
100% Material Utilization
Elimination of Post-Processing
Enhanced Process Control
Technical Capabilities & Specifications
| Feature | Specification |
|---|---|
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Mold Types
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Single Drop, Multi-Cavity (High Volume), Stack Molds, 2K/Bi-Injection.
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Gating Systems
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Valve Gate (For perfect vestige control on aesthetic parts) & Open Gate (Cost-effective for standard parts).
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System Brands
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Expertise integrating top brands (Yudo, Mold-Masters, Husky, Synventive) or cost-effective custom solutions.
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Precision
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Machined by Fanuc & Makino centers; Tolerances down to ±0.01mm.
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Resin Expertise
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Specialized in High-Temp materials: PEEK, PA+GF, PPS, LCP, IXEF.
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Steel Material
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Premium imported steel (German/Swedish/American) for core/cavity to ensure longevity.
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Hot Runner vs. Cold Runner: ROI Analysis
| Factor | Standard Cold Runner | GBM Hot Runner System |
|---|---|---|
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Material Waste
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High (Runner scrap)
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Near Zero
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Cycle Time
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Slow (Cooling runner required)
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Fast (Cooling part only)
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Part Aesthetics
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Gate marks often visible
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Clean, minimal gate vestige
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Injection Pressure
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High (High stress on part)
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Low (Better dimension control)
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Ideal For
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Low volume, cheap material
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High volume, expensive material (PEEK/PPS)
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Our Specialized Multi-Material Services
Standard molding is just the beginning. GBM Mold specializes in complex molding techniques that combine materials to improve functionality and reduce your assembly costs.
Scientific Mold Validation
We believe in "getting it right the first time." Every project begins with a rigorous Design for Manufacturability (DFM) review and Moldflow analysis. We scientifically predict and prevent potential issues—such as air traps, weld lines, or warpage—before a single piece of steel is cut, saving you time and costly modifications down the line.
In-house 2-Shot Design & Engineering Support
With over 15 years of dedicated experience in multi-component technology, our engineering team masters the science of material compatibility. We provide expert guidance on molecular bonding between rigid and soft materials (e.g., PC+TPU, ABS+TPE), ensuring robust adhesion and superior product durability without mechanical interlocks.
Precision Multi-Cavity Tooling
Scalability is at the core of our design. We build high-cavity molds optimized for balanced filling and uniform cooling. By utilizing high-speed CNC machining and mirror EDM, we achieve cavitation consistency that guarantees every part is identical, significantly boosting your output while maintaining strict dimensional stability.
Other Services
Precision CNC & EDM Services
2-Shot Mold Manufacturing
Surface Texturing & Finishing
How To Work With Us
We know that outsourcing manufacturing can feel risky. We have designed our workflow to be transparent, communicative, and disciplined. Here is what happens when you partner with GBM:
Inquiry & Feasibility Study
It starts with a conversation. Send us your 3D data or drawings. We don’t just throw a generic price at you; our engineers actually dive into the design. We check the part geometry, analyze the material selection (especially for complex dual-material bonding), and review your tolerance needs. We look for potential pitfalls before they cost you money. Within 24 hours, you’ll get a precise quote and honest technical feedback—so you know exactly what you're getting into.
01
Engineering & DFM Review
We hate surprises as much as you do. That’s why before we touch a single piece of steel, we simulate everything. We perform a comprehensive Design for Manufacturability (DFM) analysis and run Moldflow simulations. This lets us see into the future—predicting risks like sink marks, air traps, or warpage. We’ll sit down with you (virtually) to optimize the design, ensuring it’s not just "moldable," but optimized for efficient mass production.
02
Tooling Design & Approval
This is where the blueprint comes to life. We create detailed 2D and 3D mold designs, planning every cooling channel and ejection pin placement. We don't keep secrets—we share the full layout with you for review. We discuss the cooling efficiency, the gate locations, and the moving mechanisms. Construction only begins when you say "Yes." We ensure you are 100% confident in the design before we start machining.
03
Manufacturing & Weekly Updates
We know waiting is the hardest part, so we make sure you’re never left wondering, "What's happening with my mold?" During the machining phase, you become part of our workshop. Every week, your dedicated project manager will send you a Weekly Progress Report. This isn't just a spreadsheet; it includes real photos and videos of your mold on our CNC and EDM machines. You can track the steel cutting, electrode machining, and fitting process as if you were standing right here on our factory floor.
04
T1 Trial & Validation
This is the exciting part. We load your mold into our in-house injection machines for the first trial shot (T1). But we don't just look at the parts; we scrutinize them. We use our CMM equipment to generate full Dimensional Reports, checking against your original tolerances. We then ship the actual T1 samples (and the data) directly to your desk. You get to hold the product, test the fit, and verify the function yourself.
05
Texture & Final Finish
Once you confirm the samples are dimensionally correct, we focus on the aesthetics. Whether you need a specific VDI texture for grip or a mirror polish for optical clarity, this is when we apply the final surface treatments. But we don't stop there. We conduct a final "dry-cycle" test—running the mold empty for hours—to ensure every slider, lifter, and pin moves silky smooth. We make sure the tool is robust and ready for the rigors of high-volume production.
06
Global Logistics & Delivery
Global Logistics & Delivery We treat your mold like a precision instrument. Before shipping, we thoroughly clean it, apply professional rust prevention, and vacuum-seal it to protect against humidity. Whether you need it shipped fast via air or economically via sea, we handle the logistics paperwork and customs clearance assistance. We don’t consider the job done until the mold arrives safely at your facility and is producing parts on your machine.
07
Why Global Manufacturers Choose GBM for Hot Runner Mold?
Founded in 2012 in Shenzhen, GBM is a National High-Tech Enterprise with a 1,800m² state-of-the-art facility. We are an A-rated supplier (96 points) providing flexible, versatile solutions for the world’s most demanding Tier-1 suppliers.
99.9% Precision Tolerance
Using top-tier imported steel and machinery (Fanuc, Sumitomo), we achieve tolerances that allow for complex connector and medical part manufacturing.
Speed
With a 96% on-time rate for T1 samples, we help you get your product to market faster.
16 Years of "In-House" Control
We don't outsource the critical work. From mold making to injection, it happens under our roof. This means we are 100% responsible for the quality and the timeline.
Communication Without Barriers
Our team speaks English and understands Western engineering standards. You won't face the frustration of "lost in translation" or ghosting. As our clients Mike and Sarah testified, we respond quickly to modification requests.
Mastery of "Difficult" Materials
Many shops can mold standard ABS. GBM specializes in high-temperature, high-performance resins like PEEK, PPS, LCP, and Glass-Filled Nylon. We have the equipment to control mold temperatures precisely to prevent warping in these expensive materials.
Our Partners
How We Save Your Hot Runner Molds Cost?
Price matters, but value matters more. We help you reduce the Total Cost of Ownership in four specific ways:
Design for Manufacturability (DFM)
Before steel is cut, our engineers (20+ years experience) analyze gate locations and thermal balance to prevent issues.
Moldflow Simulation
We scientifically predict filling patterns and cooling efficiency to ensure the hot runner system is perfectly balanced.
In-House Manufacturing
From CNC machining to T1 trials, everything happens in our 1,800m² Shenzhen facility. We don’t outsource quality control.
Know About GBM
Rooted in Shenzhen, the global hub of manufacturing, GBM combines a decade of engineering heritage with state-of-the-art facilities to deliver world-class tooling.
Our Certifications
We stand behind our products with a robust warranty and clear refund policy, ensuring your investment is protected.
The Ultimate Guide To Precision Injection Molding Solutions By GBM
In today’s demanding industrial landscape, high-precision plastic components are no longer a luxury—they are a necessity for performance and safety. At GBM, we aim to simplify the complex journey from mold design to high-volume production. Whether you are developing intricate medical devices or complex automotive connectors, GBM provides engineering-driven solutions to meet your strictest tolerances with excellence.
Table of Contents
What is a hot runner mold?
Think of a hot runner system as a “Heated Highway” for your plastic.
Unlike traditional cold runners, our system uses an internal heated Manifold System and precise Nozzles to maintain optimal Melt Flow, keeping the resin continuously molten.
It delivers material directly to the mold cavity, ensuring you manufacture products, not waste.
Why use hot runner systems for injection molding?
The primary reason is to stop paying for waste. By eliminating the cold runner entirely, you achieve 100% material utilization, which is especially critical for maximizing your ROI when using high-cost engineering resins like PEEK, PPS, and LCP.
Furthermore, parts are ejected “ready-to-ship,” completely removing the need for manual trimming, robotic separation, or regrinding labor.
Hot runner vs cold runner injection mold: What are the key differences?
Standard cold runners generate high runner scrap, have slower cycle times due to the runner needing to cool, and often leave visible gate marks.
In contrast, a GBM hot runner system offers near-zero material waste, fast cycle times because only the part requires cooling, and clean aesthetics with minimal gate vestige.
Additionally, hot runners deliver resin at lower injection pressure, which means better dimension control for your parts.
What are the advantages and disadvantages of a hot runner system?
The main advantages are faster cycle times, 100% material utilization, and superior part quality with minimized flow lines and weld lines.The primary disadvantage is the higher initial complexity and design requirement.
We mitigate this risk through rigorous Design for Manufacturability (DFM) reviews and Moldflow analysis before a single piece of steel is cut.
Our engineers scientifically predict filling patterns and cooling efficiency to ensure the hot runner system is perfectly balanced.
How to choose the hot runner for an injection mold?
Choosing the right system depends heavily on your aesthetic requirements and budget. We offer Valve Gate systems for perfect vestige control on highly aesthetic parts, as well as Open Gate systems which are cost-effective for standard parts.
At GBM, we have the expertise to integrate top system brands like Yudo, Mold-Masters, Husky, and Synventive, or we can build cost-effective custom solutions tailored to your specific project needs.
What are the top considerations for a hot runner mold?
Precision machining and material selection are the top considerations to ensure mold longevity and high-volume output.
At GBM, our hot runner molds are machined by high-precision Fanuc and Makino centers, achieving tolerances down to ±0.01mm. We also strictly utilize premium imported steel (German/Swedish/American) for the core and cavity.
Combined with our heated manifolds that maintain consistent melt pressure at every gate, we ensure uniform dimensions across complex multi-cavity layouts.
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Frequently Asked Questions!
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The initial tooling cost is higher than cold runner molds. However, for high-volume production or when using expensive materials (like PEEK/Glass-filled Nylon), the ROI is often achieved within months due to material savings and faster cycles.
We are flexible. We can integrate systems from global leaders (like Mold-Masters, Husky, Incoe) or provide high-quality, cost-effective Asian alternatives depending on your budget and requirements.
Yes. We design our manifolds with streamlined flow channels to minimize “dead spots,” allowing for faster color changeovers compared to poorly designed systems.
Not with our design. We build our molds with maintenance in mind. Key components like heaters and thermocouples are designed for easy access. Plus, we provide a complete set of spare parts and a detailed maintenance guide with every mold to ensure your production line never stops.
Absolutely. This is a GBM specialty. For sensitive materials like PEEK or PPS, we use advanced thermal analysis to ensure the manifold temperature is perfectly balanced. This prevents material degradation (“burning”) and ensures consistent part quality, which is critical for medical and automotive components.
Let’s Perfect Your Injection Molding Project Together
From material compatibility to complex mold structures, leverage GBM’s 15+ years of expertise to avoid costly production errors. Get the technical support your project deserves.
