Rex9

We degas with regular bronze degassing tablets, can't remember the name of them. Not sure on the overheat really, I'm just an employee there and have kinda taken making this post upon myself because im tired of making the same casting twice, my boss has been doing it for a long long time and just seems to know when the temps right. Hey Frosty, Thanks for the welcome, yes LG2 is what we refer to as gun metal here. I'd say it's as safe as any other metal haha, we get requests specifically to use gun metal as its self lubricating and often used on gears and things like that. We're in the UK and yes they're gun metal bronze.

Hey everyone, I work for a small foundry and we're having some problems with LG2 castings, all moulds are made with green sand in steel boxes. The issue we're having is small air bubbles just under the surface of the castings, now this isn't everytime and is kind of hit and miss when it happens. This is becoming a major issue and we can't figure it out. We never had this problem in the past. The metal is poured into 90mm pouring cups as the entry point and the bubbles even appear in the runner when removed. Does anyone have any ideas on how to prevent this? 1st picture is bisection of a casting, as in cut in half and the second is of the runner.