Rockmax crushers can be operated in either open or closed-circuit. Closed-circuit operation is recommended in order to achieve the lowest net operating cost, best particle shape and the highest production. Rockmax crushers are intended for producing crushed products between 1 12 to 38 40mm to 10mm. Rockmax is a dynamic magnesium oxide sulfate cement technical company,engage in researching and manufacturing magnesium oxide cement (moc) product for multiple applications. Customized magnesium fire resistant board 1-4 hours