Beryllium Copper Hot Runner Bushing
Grade Equivalents: UNS C17500 (CuCo2Be) / EN CW104C / RWMA Class 3 (Primary – High Conductivity); UNS C17200 (Alloy 25) / EN CW101C / RWMA Class 4 (Optional – High Strength)
Application Focus: Hot Runner System Nozzle Bushings, Hot Tip Inserts, Manifold Bushings, & Valve Gate Sleeves
Executive Standards: ASTM B196, AMS 4650, SAE J463, ISO 5182
Size Range: Custom Precision CNC Machined to Hot Runner System Specifications (Bore 1.5mm - 50mm, OD up to 150mm)
Temper Condition: Solution Treated and Precipitation Aged (AT / TF00) for Optimal Thermal-Mechanical Balance
Core Purpose: Precision Temperature Control, Elimination of Drooling & Stringing, and Rapid Cycle Reduction
Quality Assurance: ISO9001:2015, High-Precision Mold Specs, RoHS Compliant, EN 10204 3.1 Certified
Description
Beryllium Copper Hot Runner Bushing for Injection Molding — Precision Thermal Control Solutions
Beryllium Copper Hot Runner Bushing is a precision thermal management component matched for plastic injection molding hot runner systems. We adopt C17500 (CuCo2Be) and C17200 (Alloy 25) conductive alloys for production, with thermal conductivity reaching 200–240 W/m·K, far exceeding conventional tool steel. Our products feature 1.5mm–50mm bore diameter, CNC concentricity controlled within ±0.003mm and 0.1–0.2 µm bore surface roughness. They effectively solve common molding problems including gate freezing, material drooling and long cycle time caused by steel parts. All products comply with RoHS standards and are supplied with EN 10204 3.1 factory test certificates.
What Is a Beryllium Copper Hot Runner Bushing?
This type of hot runner bushing is installed at the connection position of injection nozzles and mold cavity gates, mainly used for accurate heat transfer control. It keeps resin in fluid state during injection and accelerates resin solidification in the cooling stage.
Conventional tool steel bushings have poor thermal conductivity, which easily leads to gate freezing, cold material marks and thermal delay. Beryllium Copper Hot Runner Bushing adopts copper-beryllium alloy base material to realize fast heat transfer between heating rings and gate tips, stabilizing the whole molding process. It lowers defective rate, shortens production cycle and keeps consistent product quality in batch production.
Material Grades & Technical Specifications
Two primary grades are available, each suited to different processing priorities.
| Parameter | C17200 (Alloy 25) | C17500 (CuCo2Be) |
|---|---|---|
| Grade Standard | UNS C17200 / EN CW101C | UNS C17500 / EN CW104C |
| RWMA Class | Class 4 (High Strength) | Class 3 (High Conductivity) |
| Be Content | 1.80 – 2.00% | 0.40 – 0.70% |
| Co Content | — | 2.40 – 2.70% |
| Thermal Conductivity | 105 – 115 W/m·K | 200 – 240 W/m·K |
| Hardness (Aged) | 36 – 42 HRC | 92 – 100 HRB |
| Tensile Strength | 1130 – 1400 MPa | — |
| Yield Strength | 965 – 1200 MPa | — |
| Temper Condition | AT / TF00 (Aged) | AT / TF00 (Aged) |
| Executive Standards | ASTM B196, AMS 4650, SAE J463, ISO 5182 | ASTM B196, AMS 4650 |
| Bore Finish (Ra) | 0.1 – 0.2 µm | 0.1 – 0.2 µm |
| CNC Concentricity | ±0.003 mm | ±0.003 mm |
| Bore Range | 1.5 mm – 50 mm | 1.5 mm – 50 mm |
| OD Range | Up to 150 mm | Up to 150 mm |
C17200 is the right choice when processing abrasive resins like glass-fiber reinforced nylon or flame-retardant compounds. C17500 is preferred when maximum heat transfer speed is the priority, such as thin-wall packaging or high-cavitation medical molds.
Key Performance Advantages
The Beryllium Copper Hot Runner Bushing's consistent operation maximizes the overall production efficiency of injection molding:
Quick thermal response: To prevent gate freeze-off and cold markings, the C17500's excellent thermal conductivity quickly transfers heat to gate tips.
Reduced cycle time: Compared to tool steel bushings, faster gate cooling speeds up resin solidification and reduces cycle time by 15–35%.Melt leakage, stringing, and gate residue are prevented by precise gate temperature control.
Gate wear resistance: For extended cycle runs, aged C17200 (36–42 HRC) resists erosion and abrasive resin wear.
Prevents resin deterioration: Even heat distribution removes hot spots to prevent PC, PET, PEEK, and POM from burning or discolouring.
Stable structure: with prolonged clamping pressure, radial deformation and gate hole expansion are resisted by a yield strength of 965–1200 MPa.
Application Scenarios
Thin-wall packaging: C17500 reduces cooling time and eliminates resin leakage for PP/PE food packaging.
perfection medical parts Dimensional perfection is provided by a consistent temperature in multi-cavity moulds for syringes, connectors and medical housings.
vehicle engineering plastics: Avoid short shots and early solidification, making them ideal for glass-filled vehicle connections and structural elements.
Multi-cavity moulds with mirror finish of bores provide a better flow balance due to reduced melt friction and pressure loss in valve gates and manifolds.
Quality Control Process
Before being sent, all bushings go through a multi-step inspection process that includes testing for eddy current conductivity, Rockwell hardness, and OES chemical analysis to confirm the quality of the material and heat treatment. Bore size, OD, and concentricity are controlled by CMM inspection; internal faults are found by ultrasonic testing; and bore roughness is checked by profilometers. We use complete batch traceability, EN 10204 3.1 reports, and ISO 9001:2015.
Customization & Supply Options
Bore, OD, length, threads, flanges, and surface treatments may all be fully customised to match your hot runner designs. Acid flame-retardant materials and corrosive resins like PVC may be plated with electroless nickel or chrome. 24-hour quote service; stock products ship in 3–5 days and come with all the paperwork needed for shipment by air or sea.
Frequently Asked Questions
Q1: What is the difference between beryllium copper bushing and stainless steel bushing?
A1: Stainless steel thermal conductivity is only 15–25 W/m·K, while beryllium copper ranges from 105–240 W/m·K. Higher thermal conductivity eliminates gate thermal bottlenecks and reduces cycle time and defective rate.
Q2: How to choose between C17200 and C17500?
A2: Choose C17200 for abrasive glass fiber and flame-retardant resins; choose C17500 for faster heat transfer in thin-wall and high-precision medical molds.
Q3: Is solid beryllium copper bushing safe for workshop use?
A3: Solid finished parts are safe for daily installation and use. Only dust and smoke from dry grinding and welding need targeted ventilation protection per operating specifications.
Q4: Can it be used for corrosive resin processing?
A4: The base alloy isn't suitable for long-term use in corrosive environments. Surface plating can form a protective layer while retaining thermal conductivity.
Q5: How to verify product quality after receiving goods?
A5: Check the supporting 3.1 test report and conduct an eddy current conductivity test. Aged C17500 products reach 45–50% IACS with stable heat transfer.
Q6: What is the service life of the bushing?
A6: With standard maintenance and filtered resin materials, the bushing can stably support more than 1 million injection molding cycles.
Contact Us
Send your hot runner bushing drawings and technical requirements to js01@jstongcai.com.cn. We will provide professional technical evaluation and detailed quotation within 24 hours, and customize qualified Beryllium Copper Hot Runner Bushing products for your molding projects.
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