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Hei-Cast 8752 Vacuum Casting Material
Hei-Cast 8752 is a high-performance polyurethane resin developed to simulate the thermal and mechanical characteristics of PBT (Polybutylene Terephthalate) or heat-stabilized ABS. When standard prototyping resins fail under thermal stress, Hei-Cast 8752 excels. It is distinguished by its high heat deflection temperature and exceptional structural rigidity. At JUCHENG, we utilize this material for functional prototypes that must operate in high-temperature environments, making it ideal for under-hood automotive components, electrical housings, and industrial parts requiring long-term thermal stability.
Hei-Cast 8752

Basic Characteristics & Composition

Hei-Cast 8752 is a two-component system engineered for structural performance in heated conditions.
  • High Temperature Resistance: It maintains its shape and stiffness at elevated temperatures (HDT approx. 115°C), where standard resins would warp or soften.
  • PBT/ABS Simulation: It mimics the rigidity, hardness, and heat resistance of production-grade engineering thermoplastics.
  • High Rigidity: Possesses a high flexural modulus, making it suitable for structural parts that must resist bending under load.
  • Surface Finish: Cures to a smooth, hard surface that can be easily painted or textured.
Hei-Cast 8752 prototype

Color Options

  • Standard: Beige / Light Brown.
  • Painting: Its neutral base color and hard surface make it an excellent substrate for high-quality paint finishes, including metallic and gloss coatings. JUCHENG recommends painting for the best aesthetic results.

Key Technical Parameters

1.Mechanical Properties (Typical values):
Property Value Unit Standard
Hardness 80 - 85 Shore D JIS K 7215
Flexural Modulus 2,200 - 2,400 MPa JIS K 7171
Tensile Strength 60 - 70 MPa JIS K 7113
Elongation at Break 5 - 10 % JIS K 7113
Heat Deflection Temp (HDT) 110 - 115 °C JIS K 7191
Impact Strength (Izod) 3 - 5 kJ/m² JIS K 7110
Linear Shrinkage 0.3 - 0.4 % -
2. PROCESSING 
  • Vacuum Casting: Requires a high-quality vacuum process to ensure a dense, bubble-free part, which is critical for thermal performance.
  • Pot Life: Approx. 8-10 minutes.
  • Demolding: 60 minutes at 70°C.
  • Post-Curing: A multi-stage thermal post-cure is mandatory to achieve the rated heat deflection temperature. JUCHENG follows strict curing profiles to maximize performance.
3. PRECAUTIONS:
  • Brittleness: Like most high-temp resins, it is more brittle than PP-like simulants. Sharp corners should be avoided in the design.
  • Moisture: Sensitive to humidity before casting.
4. STORAGE:
Conditions: Store in a dry, cool place away from sunlight.
 

Application Scenarios & Fields

Hei-Cast 8752 is essential for thermal validation prototypes:
  • Automotive: Under-hood components (engine covers, air boxes), HVAC housings, lighting bezels.
  • Household Appliances: Coffee machine internal structures, toaster housings, hairdryer components.
  • Industrial: Pump housings handling warm fluids, motor casings, electrical switchgear.
  • Electronics: Power supply casings, projector lamp housings.

Vacuum Casting Process Compatibility

  • Silicone Tooling: Compatible with standard silicone molds.
  • Machining: Cured parts are hard and machine cleanly. They can be drilled, tapped, and CNC trimmed.
  • Inserts: Excellent for casting in metal threaded inserts due to its high rigidity.

Advantages vs. Limitations

Advantages Limitations
High Heat Resistance: Stable up to ~115°C. Impact Resistance: Lower impact strength compared to tough ABS or PP simulants.
High Rigidity: Excellent stiffness for structural parts. Color: Limited to beige/brown in its natural state; requires painting for aesthetics.
Good Machinability: Cures to a hard, machinable solid. Cost: Premium high-temp resin is more expensive than standard types.
Dimensional Stability: Low shrinkage ensures accuracy.  

Manufacturers & Alternatives

  • Manufacturer: Hei-Cast (H&K Ltd., Japan).
  • Alternatives at JUCHENG:
For even higher heat resistance: We recommend Hei-Cast 8570.
For a black, high-temp option: We recommend Axson PX 223.
For a standard, non-heat resistant ABS simulant: We recommend Hei-Cast 3012.
Learn more about ABS type materials
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