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Hei-Cast 8570 Vacuum Casting Material
When functional prototypes face extreme thermal environments, Hei-Cast 8570 is the ultimate solution in the polyurethane casting family. Engineered to simulate the performance of Heat-Stabilized ABS, Polypropylene, or even PPS, this high-performance resin offers an exceptional Heat Deflection Temperature (HDT) of approximately 120°C. At JUCHENG, we utilize Hei-Cast 8570 for the most demanding thermal validation projects. Whether testing airflow in an automotive engine bay or verifying lighting components near high-output LEDs, this material ensures your prototype retains its dimensions and stiffness where other resins would fail.
Hei-Cast 8570

Basic Characteristics & Composition

Hei-Cast 8570 is a premium three-component system (Polyol, Isocyanate, Catalyst) designed for maximum thermal stability.
  • Extreme Heat Resistance: Withstanding temperatures up to 120°C, it rivals the thermal performance of many injection-molded engineering thermoplastics.
  • High Rigidity: It exhibits a high flexural modulus, ensuring parts do not sag or warp under thermal load.
  • Dimensional Stability: Features very low shrinkage and excellent creep resistance, making it suitable for precision mechanical parts.
  • Chemical Resistance: Offers improved resistance to automotive fluids (oils, coolants) compared to standard resins.
Hei-Cast 8570 prototype

Color Options

  • Standard: Pale Brown / Beige (Natural).
  • Finishing: Due to its natural dark beige color, it is not suitable for transparent or bright white parts without painting. However, its hard surface is an excellent base for high-temp paints and primers applied by JUCHENG's finishing team.

Key Technical Parameters

1.Mechanical Properties (Typical values):
Property Value Unit Standard
Hardness 84 - 86 Shore D JIS K 7215
Flexural Modulus 2,400 - 2,600 MPa JIS K 7171
Tensile Strength 70 - 75 MPa JIS K 7113
Elongation at Break 5 - 8 % JIS K 7113
Heat Deflection Temp (HDT) 115 - 120 °C JIS K 7191
Impact Strength (Izod) 3 - 5 kJ/m² JIS K 7110
Linear Shrinkage 0.3 - 0.4 % -
2. PROCESSING 
  • Vacuum Casting: Must be processed in a high-vacuum chamber. The high viscosity requires careful mold gating design to ensure complete filling.
  • Pot Life: Short (approx. 5-7 minutes). Requires rapid mixing and pouring.
  • Demolding: 60-90 minutes at 70°C.
  • Post-Curing: Critical. A stepped high-temperature post-cure cycle (e.g., ramping up to 120°C) is mandatory. Without this, the material will not achieve its heat resistance properties.
3. PRECAUTIONS:
  • Brittleness: High heat resistance often correlates with lower impact strength. Avoid thin snap-fits or sharp internal corners.
  • Mold Life: High-temp resins can be aggressive to silicone molds, potentially reducing mold life to 12-15 parts.
4. STORAGE:
  • Conditions: Store in a cool, dry place. The catalyst component requires specific handling.
 

Application Scenarios & Fields

Hei-Cast 8570 is the standard for "Hot Zone" validation:
  • Automotive: Intake manifolds, cylinder head covers, turbocharger ducting prototypes, radiator components.
  • Lighting: Reflectors and bezels for high-intensity discharge (HID) or LED lamps.
  • Industrial: Housings for pumps handling hot liquids, industrial heater vents.
  • Electronics: Power supply chassis, heat sink mounts, projector internal frames.

Vacuum Casting Process Compatibility

  • Silicone Tooling: Compatible with heat-resistant silicone grades.
  • Machining: Cured parts are very hard and machine like metal or bone. Excellent for drilling precision holes post-casting.
  • Inserts: Ideal for heat-staking inserts, as the material will not soften easily under the heat of the installation tip.

Advantages vs. Limitations

Advantages Limitations
Top-Tier Heat Resistance: HDT ~120°C. Low Impact: Brittle under sudden shock loads.
High Stiffness: Excellent structural integrity. Color: Natural color is dark; limited aesthetic options without painting.
Creep Resistance: Holds tolerances under load. Cost: Premium material with complex processing (post-cure).
Engineering Feel: Simulates high-end plastics. Mold Wear: Reduces silicone mold lifespan.

Manufacturers & Alternatives

  • Manufacturer: Hei-Cast (H&K Ltd., Japan).
  • Alternatives at JUCHENG:
For moderate heat (105°C) & lower cost: We recommend Hei-Cast 8015.
For a black high-temp option: We recommend Axson PX 223.
For toughness (no heat req): We recommend Axson UP 6160.
Learn more about ABS type materials
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