Silicone Mold Runner & Venting Tutorial: Eliminate Porosity and Blurry Details in Zinc Alloy Badge Production

Struggling with porosity and blurred details in zinc alloy spin casting? Over 80% of defects come not from your equipment, but from silicone mould making.

When making your silicone mould, carve smooth tapered runners along the centrifugal force direction. The tapered design progressively accelerates the molten metal, reducing turbulence and resistance, ensuring that the zinc alloy reaches the farthest end of the cavity.

When cutting the mould, add fine air vent channels at cavity edges. These microscopic vents allow trapped air to escape before the molten metal arrives, while being small enough to prevent metal leakage. Proper vent design effectively eliminates porosity defects in castings

To achieve full fills, zero porosity, and crisp details on every single cast, you must combine precision runner design with a fine venting system, paired with proper high rotational speeds.

For centrifugal casting of zinc alloy badges, equipment is the foundation, but the mould is the soul. If you have any questions about silicone mould operation for spin casting, feel free to contact us for professional technical support.