MJF PA12 Parts | Natural Gray vs Black Dyed Finish
Project Overview
This project demonstrates the appearance difference between natural gray MJF PA12 parts and black dyed MJF PA12 parts.
The same geometry was manufactured using HP Multi Jet Fusion technology and then processed using two different finishing options.
About HP MJF PA12
HP PA12 is a high-performance engineering thermoplastic developed specifically for Multi Jet Fusion technology. It provides excellent dimensional accuracy, good mechanical strength, and superior production efficiency for functional prototypes and end-use components.
| Property | Test Standard | Value |
|---|---|---|
| Shore D Hardness | ASTM D2240 | 80 |
| Flexural Modulus | ASTM D790M | 1800 MPa |
| Flexural Strength | ASTM D790M | 70 MPa |
| Tensile Modulus | ASTM D638 | 1800 MPa |
| Tensile Strength | ASTM D638 | 48 MPa |
| Elongation at Break | ASTM D638 | 15% |
| Notched Impact Strength | ASTM D256 | 3.5–3.6 kJ/m² |
| Heat Deflection Temperature | ASTM D648 @66 PSI | 175°C |
| Particle Size | ASTM D3451 | 60 μm |
| Item | Value |
|---|---|
| Material | HP PA12 |
| Technology | HP Multi Jet Fusion (MJF) |
| Color | Natural Gray |
| Build Volume | 370 × 276 × 360 mm |
| Dimensional Accuracy | ±0.3 mm or ±0.4% |
| Recommended Wall Thickness | 1 mm |
| Heat Deflection Temperature | 175°C |
Manufacturing Process
Technology
- HP Multi Jet Fusion (MJF)
Material
- PA12 Nylon
Surface Finish Options
- Natural Gray Finish
- Black Dye Finish
Why Surface Finish Matters
For functional prototypes and low-volume production parts, appearance requirements vary significantly.
Natural gray parts provide a cost-effective solution for engineering validation and mechanical testing.
Black dyed parts improve visual appearance and create a more production-ready aesthetic for customer demonstrations and product presentations.
Natural Gray MJF PA12 Parts
- As-printed surface
- Uniform gray appearance
- Suitable for engineering prototypes
- No additional coloring process
Black Dyed MJF PA12 Parts
- Deep black appearance
- Improved visual presentation
- Better perceived product quality
- Common choice for end-use components
Comparison
| Feature | Natural Gray | Black Dyed |
|---|---|---|
| Cost | Lower | Slightly Higher |
| Appearance | Industrial | Premium |
| Surface Texture | Same | Same |
| Mechanical Properties | Same | Same |
| Typical Use | Engineering Validation | Customer Demonstration |
Applications
- Functional Prototypes
- Consumer Electronics
- Robotics Components
- Industrial Equipment
- End-Use Plastic Parts
Project Information
Technology:
HP MJF
Material:
PA12 Nylon
Finishing:
Natural Gray / Black Dye
Application:
Prototype and Low Volume Production