21 Jun, 2014 used should possess some certain heat and inoxidizability. This is because that the oil tank of sand making machine is small and the adding quantity of lubrication oil is not so large, moreover, if the sand making machine works for a long time, the temperature of each parts will be very high. So the lubrication oils should have strong thermostability.
2. As we know, during operation, the sand mak
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