of hydrocarbons (paraffins, petrolatum, mineral oil, synthetic hydrocarbons, etc,). ointments have a yellow paraffin base. ointments are greasy, absorbtive and highly macerating. the simple definition is ointments are semisolid preparations intended for external application to the skin or mucous membranes...
war, natural rubber plantations no longer had a stranglehold on rubber supplies, particularly after chemists learned to synthesize isoprene. gr-s remains the primary synthetic rubber for the manufacture of tires. synthetic rubber also played an important part in the space race and nuclear arms race. solid...
more machinery road construction machinery road construction equipment asphalt paver asphalt distributor view more cement plant machinery cement silo fly ash silo cement silo parts view more construction machinery asphalt plants mobile asphalt plant soil stabilizer view more cnc machines cnc lathe machine...
engineering instruments laboratory instruments special instruments other physical & chemical instruments experimental analytical instrument weighing apparatus cinematographic instruments photographic instruments other photomechanical & cinematographic instruments other instruments and apparatuses machine-tools...
engineering instruments laboratory instruments special instruments other physical & chemical instruments experimental analytical instrument weighing apparatus cinematographic instruments photographic instruments other photomechanical & cinematographic instruments other instruments and apparatuses machine-tools...
deposits with economic development value account for about % of the land area, and more than kinds of economically useful minerals. other minerals in the top are tungsten, molybdenum, graphite, barite, fluorite and others. according to the korea mineral resources corporation, the dprk has tons of tungsten...