Comparing with cast iron materials, silicon nitride riser tube for low pressure die casting has low heat conduction. Its super heat preservation can prevent the temperature reducing of aluminum solution in low pressure casting. We use the way of GPS to get high density, which makes it possible to keep high mechanical strength when temperature rises. It will reduce the risk of air leakage and damage if load and strength are weak. It is not easy to adhere aluminum, so it makes daily maintenance more convenient.

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