Handling and measurement
Diluent
Last updated
The liquid added to a powder, named by the job it does rather than by what it is. In this space it is almost always bacteriostatic water or sterile water. Strictly, the liquid that first turns a powder into a solution is a reconstituting fluid and a diluent is what thins an existing solution further, but labels and everyday use call both of them diluent.
Why it matters here
The diluent is one of the two inputs a beyond-use date is derived from here, the other being how the vial is stored. Bacteriostatic water carries a preservative that keeps working after the stopper is pierced and plain sterile water does not, so the same powder in the same fridge gets two different usable windows depending only on this choice.
What it is not
Diluent is a role, not a product, so a record calling for diluent has not told you which liquid to use. Sterile water and bacteriostatic water are both diluents, both dissolve the powder equally well, and are not interchangeable in their effect on how long an opened vial lasts.
Also called
- diluent
- diluents
- solvent
- reconstituting fluid
- reconstitution fluid
- mixing water
Solvent and reconstituting fluid describe the same liquid from a chemical and a procedural angle. People often just say bac water, naming one specific product where the general word was meant.
Compounds carrying this term
None on file yet. This term is in the controlled vocabulary but no compound record currently uses it — which is a statement about our coverage, not about the term.