There are several important molding variations including:

• Co-injection (sandwich) molding

• Fusible (lost, soluble) core injection molding

• Gas-assisted injection molding

• In-mold decoration and in mold lamination

• Injection-compression molding

• Insert and outsert molding

• Lamellar (microlayer) injection molding

• Low-pressure injection molding

• Microinjection molding

• Microcellular molding

• Multicomponent injection molding (overmolding)

• Multiple live-feed injection molding

• Powder injection molding

• Push-Pull injection molding

• Reaction injection molding

• Resin transfer molding

• Rheomolding

• Structural foam injection molding

• Structural reaction injection molding

• Thin-wall molding

• Vibration gas injection molding

• Water assisted injection molding

• Rubber injection

• Injection molding of liquid silicone rubber