Hei-Cast 8743 Vacuum Casting Services | Heat Resistant PBT/PA Simulant

Hei-Cast 8743 Vacuum Casting Material

For functional prototypes that must operate in punishing thermal environments without losing their shape, Hei-Cast 8743 is a top-tier solution. This advanced polyurethane resin is engineered to simulate the thermal and structural properties of semi-crystalline plastics like PBT (Polybutylene Terephthalate) and PA (Polyamide/Nylon). Offering a higher heat deflection temperature than standard high-temp resins, it ensures dimensional stability even under significant thermal load. At JUCHENG, we recommend Hei-Cast 8743 for the validation of automotive engine components, industrial heater housings, and electronic assemblies where thermal management is critical.

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Hei-Cast 8743

Grundlegende Eigenschaften & Zusammensetzung

Hei-Cast 8743 is a two-component system formulated for high-rigidity applications.

Superior Thermal Resistance: Capable of withstanding temperatures up to 120°C, making it one of the most robust thermal resins available for vacuum casting.
High Stiffness: It exhibits a high flexural modulus, simulating the rigid feel of glass-filled engineering plastics.
PBT/PA Simulation: Matches the mechanical profile of industrial thermoplastics used in injection molding.

Dimensional Accuracy: Low shrinkage rates allow for precise fit-checks of mating components.

Color Options

Standard: Beige / Pale Brown (Natural).
Endbearbeitung: The surface is hard and dense, providing an excellent base for sanding and painting. JUCHENG can apply heat-resistant coatings if required to match specific aesthetic needs.

Wichtige technische Parameter

1.Mechanical Properties (Typical values):

Eigenschaft	Wert	Einheit	Standard
Hardness	82 - 85	Shore D	JIS K 7215
Biegemodul	2,300 - 2,500	MPa	JIS K 7171
Zugfestigkeit	65 - 75	MPa	JIS K 7113
Bruchdehnung	5 - 8	%	JIS K 7113
Heat Deflection Temp (HDT)	115 - 120	°C	JIS K 7191
Schlagzähigkeit (Izod)	4 - 6	kJ/m²	JIS K 7110
Linear Shrinkage	0.3 - 0.4	%	-

2. PROCESSING

Vakuumguss: Must be processed under strict vacuum conditions. Any trapped air will expand during the high-temp post-cure, causing defects.
Pot Life: Approx. 6-8 minutes. Requires efficient pouring techniques for larger parts.
Demolding: 60-90 minutes at 70°C.
Post-Curing: Mandatory. To achieve the 120°C heat resistance, parts must undergo a stepped post-cure cycle (e.g., rising from 70°C to 120°C over several hours) while supported on fixtures.

3. PRECAUTIONS:

Warpage Risk: Due to high heat treatment, unsupported thin walls may warp during post-cure. JUCHENG engineers design custom fixtures to prevent this.
Sprödigkeit: High rigidity comes with lower impact strength. Avoid designing sharp corners or thin snap-fits.

4. STORAGE:

Conditions: Store in a cool, dry place. Keep containers nitrogen-purged to extend shelf life.

Application Scenarios & Fields

Hei-Cast 8743 is designed for "hot zone" testing:

Automobil: Intake manifolds, thermostat housings, lighting internal bezels, engine covers.
Industrie: Casings for motors, pumps, and compressors generating operating heat.
Elektronik: Heat sink mounts, projector housings, power supply enclosures.

Appliance: Internal structural frames for coffee machines, irons, or hair dryers.

Vacuum Casting Process Compatibility

Silicone Tooling: Compatible with standard silicone. High-temp resins can reduce mold life slightly faster than ABS simulants due to chemical aggression.
Machining: Excellent machinability. Cured parts can be drilled, tapped, and faced to tight tolerances.
Inserts: Ideal for heat-staking inserts or casting brass inserts in place.

Advantages vs. Limitations

Advantages	Limitations
Excellent Heat Resistance: HDT ~120°C.	Low Impact Strength: More brittle than PP or ABS simulants.
High Stiffness: Great for structural loads.	Color: Limited to beige/brown; not transparent.
Dimensional Stability: Holds shape under heat.	Cost: Higher material and processing cost (due to post-cure).
PBT/PA Feel: Simulates engineering plastics well.	Lead Time: Post-curing adds time to the production schedule.

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 alternative: We recommend Axson PX 223.
For better toughness (lower heat): We recommend Hei-Cast 3012.

Learn more about ABS type materials

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