Dissolving procedure of "EXCEVAL" [1] Countermeasure for foaming When "EXCEVAL" is dissolved or "EXCEVAL" solution is used, foaming may occur to the solution depending on agitation speed and solution viscosity. Although any antifoaming agents are effective to prevent foaming, original characteristics of "EXCEVAL" may not be demonstrated by using any grades or amount of antifoaming agent. [2] Storage (1)Viscosity When "EXCEVAL" solution is preserved (especially at low temperature), the solution viscosity seldom increases. However, it is recommended to use as soon as possible. (2)Mold, rust and putrefaction "EXCEVAL" itself is quite stable against micro organic; however in some cases, water may develop mold, rust and putrefaction. If the solution is stored for long time, preservatives and rust proofing agents should be added.