Abstract: In this paper，using sodium hydroxide and aluminum nitrate as raw materials，the ultrafine powder of Al(OH)3 have been prepared by the reaction of molecule solids in usual temperature. the products have been characterize by the differential X-ray powder diffraction(XRD)，the analysis of partical degree contribution and application in the rubber as fire retardant.The results show that the technique is feasible in practical applications.The powder has high purity and application in the CIIR rubber the fire retardant is improved.
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