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topic 5939

Simply Rinsing Zinc Diecastings Seems to Contaminate the Water with Zinc


We are using a resin from Imprex to impregnate aluminum diecastings which seals the porosity. Does anyone know if diecast aluminum will emit small amounts of metals into the hot rinse water? Our castings can have up to 3% zinc and for some reason, we are getting zinc in our rinsewater. The tank is a 500 gallon tank which is dumped weekly. During a week, we send over 100,000 diecastings thru the system weighing about 2 pounds each with lots of surface area.

We can't explain the presence 3PPM of zinc any other way. There is no zinc in the resin material. Our sewer permit does not allow this amount of zinc to go to sewer so we will have to treat or haul this additional fluid. Any ideas?

Ray Raymond
- Fletcher, North Carolina


I would analyze the used resin for zinc to see if zinc is being dissolved during impregnation.

pooky tom pullizi signature
Tom Pullizzi
Falls Township, Pennsylvania

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