Resin Vacuum Casting Applications

Vacuum casting typically involves degassing resin under vacuum, pouring it into a mold or housing, and curing it into shape. Common resins include epoxy, polyurethane, silicone rubber, and unsaturated polyester. 

Its applications fall into the following categories:

1. Power & Electrical Insulation The most typical and highest-volume application, for parts requiring high insulation, low partial discharge, and high-voltage resistance:

• Dry-type transformers, instrument transformers, reactors
• High-voltage switches, insulators, bushings, busbar connectors
• Cable accessories, surge arresters, capacitors
• Motor stators, insulation parts for wind/solar/energy-storage converters
• Ring main units, embedded poles, insulating cylinders

2. Electronics & Semiconductor Packaging For potting, encapsulation, and insulation protection:

• Power modules, IGBTs, sensors, connectors
• PCBs, control boards, LED modules
• Inductors, transformers, capacitors
• Assemblies requiring moisture resistance, thermal conductivity, or vibration resistance

3. New Energy Vehicles & Rail Transit

• Drive motors, OBCs, DC-DC converters, battery management systems
• Charging guns, high-voltage connectors, ignition coils
• Traction converters, rail transit insulation components

4. Aerospace & Defense

• Radomes, antennas, connectors
• High-temperature insulation parts, lightweight composite structures
• Potting of high-reliability electronic modules

5. Rapid Prototyping & Small-Batch Replication

• Silicone-mold replicas of prototypes, housings, and automotive interior parts
• Medical device housings, consumer products, transparent parts
• Small-batch production replacing injection-molded parts

6. Composites & Mold Making

• Vacuum-assisted resin transfer molding/infusion: wind turbine blades, boats, sports equipment, automotive structural parts
• Epoxy molds, checking fixtures, jigs, tooling

7. Medical, Dental & Crafts

• Dental models, denture bases
• Jewelry, sculptures, decorative items, replicas

In summary: resin vacuum casting is ideal for parts that demand high insulation, zero bubbles, high density, complex thin walls, and small-to-medium batch sizes. Epoxy dominates electrical applications, while polyurethane is the go-to for rapid manufacturing.