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Hei-Cast 8263 Vacuum Casting Material
When prototypes require extreme durability and resistance to brittle fracture, Hei-Cast 8263 is the material of choice. This high-performance polyurethane resin is formulated to simulate the physical characteristics of High-Density Polyethylene (HDPE) and Polypropylene (PP). Unlike standard ABS-like resins that may crack under sudden load, Hei-Cast 8263 absorbs energy, making it virtually "unbreakable" in standard use conditions. At JUCHENG, we utilize this resin to manufacture functional automotive parts and protective casings that must survive rigorous drop tests and assembly strains.
Hei-Cast 8263

Basic Characteristics & Composition

Hei-Cast 8263 is designed to bridge the gap between rigid plastics and semi-flexible materials.
  • HDPE/PP Simulation: It replicates the waxy, tough feel of polyethylene and polypropylene.
  • High Impact Strength: Its defining feature is superior impact resistance. It will dent or deform rather than shatter upon impact.
  • Flexibility: It offers a lower modulus (stiffness) than ABS simulants, allowing for significant bending and flexing without permanent deformation or cracking.
  • Wear Resistance: Good resistance to abrasion, suitable for parts that undergo friction.
Hei-Cast 8263 prototype

Color Options

  • Standard: White / Milky White.
  • Color Matching: JUCHENG can pigment the resin to achieve specific colors (e.g., Black for automotive bumpers, Safety Orange for industrial guards).
  • Painting: Due to its flexibility, we use specialized elastomeric primers and paints to ensure the coating does not crack when the part is bent.

Key Technical Parameters

1. Mechanical Properties (Typical values after post-curing):
Property Value Unit Standard
Hardness 75 - 80 Shore D JIS K 7215
Flexural Modulus 800 - 1,000 MPa JIS K 7171
Tensile Strength 35 - 45 MPa JIS K 7113
Elongation at Break 20 - 30 % JIS K 7113
Heat Deflection Temp (HDT) 65 - 75 °C JIS K 7110
Impact Strength (Charpy) 8 - 12 kJ/m² JIS K 7191
Linear Shrinkage 0.3 - 0.5 % -

2. PROCESSING 
  • Vacuum Casting: Requires a high-quality vacuum environment to prevent porosity, which could compromise toughness.
  • Pot Life: Approx. 6-8 minutes at 25°C. The fast reaction time requires efficient process control by our technicians.
  • Demolding: 60 minutes at 60-70°C.
  • Curing: Standard thermal post-cure is necessary to maximize impact properties.
 
3. PRECAUTIONS 
  • Surface Tacky: PE-like resins can sometimes feel slightly tacky immediately after demolding; JUCHENG employs specific cleaning protocols to ensure a smooth, dry finish.
  • Humidity: The hardener component is sensitive to moisture.

4. STORAGE 
  • Conditions: Store in a cool, dry place. Shelf life is typically shorter than rigid ABS resins, so we maintain fresh stock rotation.
 

Application Scenarios & Fields

Hei-Cast 8263 is essential for "crash-proof" prototyping:
  • Automotive: Bumper prototypes, fender flares, interior trim clips, crash-test components.
  • Protective Gear: Helmets, knee pads (hard shell), tool housings that endure job-site abuse.
  • Packaging: Shampoo bottles, flexible containers, flip-top caps.
  • Living Hinges: Functional prototypes of integrated box hinges that need to open and close repeatedly.

Vacuum Casting Process Compatibility

  • Silicone Tooling: Compatible with standard molds. Due to the resin's toughness, demolding complex undercuts is easier than with rigid brittle resins.
  • Machining: Can be drilled and trimmed, but due to its "gummy" nature (like real PE), high-speed cutting can cause melting. We use sharp tools and slow speeds.
  • Finishing: Best suited for Matte or Textured finishes. High-gloss polishing is difficult due to the material's softness.

Advantages vs. Limitations

Advantages Limitations
Extreme Toughness: Excellent shock absorption. Low Heat Resistance: HDT is around 70°C. Not for high-temp zones.
High Elongation: Can bend significantly without breaking. Polishing: Difficult to achieve a mirror finish; matte is best.
Snap-Fit Friendly: Ideal for clipping parts together. Rigidity: Not suitable for structural parts requiring high stiffness (will flex).
Chemical Resistance: Good resistance to common household chemicals.  

Manufacturers & Alternatives

  • Manufacturer: Hei-Cast (H&K Ltd., Japan).
  • Alternatives at JUCHENG:
For a European alternative (PP): We recommend Axson UP 5690.
For even higher impact (ABS/PC): We recommend Axson UP 3691.
For rigid parts: We recommend Hei-Cast 8150.
Learn more about ABS type materials
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