The present invention provides gibbsite type aluminum hydroxide particles having a primary particle diameter of from 0.01 .mu.m to 0.3 .mu.m and a DOP oil absorption of from 90 mL/100 g to 300 mL/100 g.

 
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< Precipitated silica materials exhibiting high compatibility with cetylpyridinium chloride

> Hydrogen purification process and system
~ 00469