Non-Magnetic Tungsten Carbide Injection Mold Core Inserts
Achieve zero magnetic interference in precision molding with our non-magnetic carbide injection mold core inserts. WC-Ni alloy with HRA 87-92 hardness, µ < 1.002 permeability, and ±0.002mm precision for medical, electronics, and ferrite component manufacturing. Custom designs available.
Non-Magnetic Foundation for Precision Molding
In the production of magnetic materials—ferrites, bonded magnets, magnetic polymers—the mold itself must be magnetically invisible. Conventional steel molds introduce contamination risks, while standard tungsten carbide (WC-Co) retains unwanted magnetic properties. Our Non-Magnetic Carbide Injection Mold Core Inserts (also known as mold cavity blocks) are engineered specifically for this challenge.
Manufactured from specialized WC-Ni (Tungsten Carbide-Nickel) alloy, these precision components deliver the essential combination of absolute magnetic neutrality, exceptional wear resistance, and micron-level accuracy for demanding injection molding applications in the magnetic materials, medical device, and electronics industries.
Core Technology & Material Science
True Non-Magnetic Performance (µ < 1.002)
By utilizing a nickel-based binder system instead of conventional cobalt, our mold core inserts are completely free of ferromagnetic elements. This delivers:
- Zero magnetic attraction to ferrous particles, preventing contamination in cleanroom environments
- No interference with magnetic fields—essential for molding ferrite components, magnetic polymers, and MRI-compatible medical parts
- Complete compatibility with sensitive electronic and medical device manufacturing requirements
The science: Nickel (Ni) has a relatively low Curie point, which can be reduced below room temperature through specialized processing, enabling the production of truly non-magnetic cemented carbide materials.
Optimized Hardness & Toughness Balance
Our non-magnetic carbide grades offer hardness ranging from HRA 86.9 to 92, depending on the specific application requirements:
| Property |
Typical Range |
Benefit |
| Hardness |
HRA 87 - 92 |
3-5x longer life than tool steel |
| Density |
13.96 - 14.9 g/cm³ |
High rigidity, excellent wear resistance |
| Grain Size |
1.2 µm (sub-micron) |
Superior surface finish capability |
| Flexural Strength |
2000 - 2900 MPa |
Good toughness, crack resistance |
This balanced formulation provides significantly higher wear resistance than tool steel while maintaining superior toughness compared to harder, more brittle carbides.
Precision Machining & Tight Tolerances
Our manufacturing capabilities achieve:
- Critical dimension tolerances: ±0.002mm or better
- Surface finish: Ra 0.4 µm (standard) to Ra 0.1 µm optical polish
- Complex cavity profiles: As per customer drawings, achievable to ±0.003mm
Technical Specifications
| Parameter |
Standard Capability |
High-Precision Option |
| Material |
WC-Ni Non-Magnetic Alloy |
Multiple grades for wear/toughness balance |
| Hardness |
HRA 86.9 - 92 |
Consistent throughout |
| Magnetic Permeability |
< 1.002 |
Certifiable per batch |
| Density |
13.96 - 14.9 g/cm³ |
Uniform structure |
| Grain Size |
1.2 µm (standard) |
Sub-micron available |
| Key Tolerances |
±0.005mm (standard) |
± 0.002mm or better |
| Cavity Profile Accuracy |
As per customer drawing |
±0.003mm achievable |
| Surface Finish |
Ra 0.4 µm (ground) |
Ra 0.1 µm or better (optical polish) |
| Flexural Strength |
2000 - 2900 MPa |
Grade-dependent |
Performance Comparison
| Property |
Our Non-Magnetic Carbide Insert |
Hardened Tool Steel Insert |
Standard Carbide Insert (WC-Co) |
| Magnetic Permeability |
< 1.002 (Non-Magnetic) |
> 100 (Highly Magnetic) |
1.5 - 2.0 (Magnetic) |
| Hardness |
HRA 87 - 92 |
HRC 50 - 55 |
HRA 90 - 92 |
| Wear Life |
Millions of cycles (3-5x steel) |
Moderate |
Exceptional |
| Surface Finish Retention |
Excellent |
Degrades over time |
Excellent |
| Corrosion Resistance |
Excellent (Ni binder) |
Good |
Good |
| Ideal Application |
Ferrite, medical, electronics molding |
General purpose |
Not for magnetic-sensitive uses |
Key Applications & Industries
| Industry |
Application |
Why Choose Our Insert |
| Magnetic Material Molding |
Ferrite cores, magnetic polymer components, bonded magnets |
Absolute non-magnetic property prevents material magnetization; eliminates magnetic attraction during powder filling |
| Medical Device Manufacturing |
Implantable components, diagnostic consumables, MRI-compatible parts |
Zero magnetic contamination, cleanroom compatibility, corrosion resistance |
| Precision Electronics |
Sensor housings, micro-switches, connector components |
Exceptional wear resistance maintains critical cavity dimensions over millions of cycles |
| Optical Component Molding |
Lens holders, light guides, precision optical parts |
Mirror-finished cavities (Ra <0.1µm) prevent optical defects |
| Powder Injection Molding (MIM/CIM) |
Metal and ceramic micro-components |
Superior wear resistance for abrasive feedstocks |
