WITSML - Cement Additive Component Schema Additive name. Additive type or Function (Retarder, Visosifier, Weighting agent). Wet or Dry. Additive density. ConcentrationType: %BWOC (%By weight of Cement), %BWOB (%By weight of blend), %BWOW (%By weight of water), %BWOBF (%By weight of base fluid) Concentration Amount: unit type depends of typeConc. Concentration in terms of weight per sack. Concentration in terms of volume per sack. Additive Amount. Unique identifier for the additive.