METHOD FOR DEVELOPING HIGH-STRENGTH AND HIGH PERMEABILITY FILTERING CAPACITY CAST STONE

摘要

Furan resin, phenol-formaldehyde- or epoxy-resin is mixed with pref. polymerisation catalyst (corresp. to pref. setting timers), and with high strength granular matter. Above compsn. is mixed with 5-40 vol.% of a water or dil. acid leachable salt. E.g. completed mixt. is cast in moulds, set and its soluble salt content is washed out.