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What Hardness of PU is best for Vibratory Finishing Machine Bowls?

What will be advantage of using 90 Shore A hardness of Poly Urethane Lining in Vibratory Bowl as compared to normal 80 shore A Hardness of Polyurethane lining in Vibratory Bowl. I want this information in relation to the effect this change will have on finishing process on some of the components made up of Sheet Metal and Forged parts.

Amit Suthar
Machine Builder - Baroda, Gujarat, India
2004

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