Glossary
Cumulative particle counts
Particle counters display readings in two columns: cumulative (often depicted by ∑ sigma) and differential (often depicted by ∆ delta). The cumulative total shows the amount of particles that were found at that size and greater. The differential total shows the counts which are at least that size in diameter…D value
De-centralised air handling
Through a de-centralised air handling approach, the same results can be delivered as with…
Decontamination
A process that eliminates viable bioburden via use of chemical agents. Source: GMP Draft…
Deionised water (DI water of DIW)
Deionized water is water that has had almost all of its mineral ions removed, however…
Delta (∆) column of particle counts
Particle counters display readings in two columns: differential (depicted by ∆ delta) and cumulative…
Depyrogenation
A process used to destroy or remove pyrogens (e.g. endotoxin). Source: GMP Draft Annex…
Dew point
Dew point (dp) is the temperature that a volume of air reaches when it…
Dewpoint vs humidity
Dewpoint (dp) is the temperature that a volume of air reaches when it becomes…
Differential particle counts
Particle counters display readings in two columns: differential (depicted by ∆ delta) and cumulative…
Disinfection
“The process by which surface bioburden is reduced to a safe level or eliminated.…
Door interlock
Door interlock or interlocked doors support good cleanroom entry and exit practices by only…
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