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The concept of contamination control originated as
early as the medieval period. However, it was during
the 20th century and
the subsequent race to
space that brought about
the need for precision
manufacturing in clean
environments, and the idea
for the modern cleanroom
was born. This article
explores the journey of the development of contamination control, and
also discusses what may be in the future for cleanrooms.
A New Rating Figure for Assessing
Cleanliness in Cleanrooms?
Depending on requirements and the technical equipment implemented, with
be achieved for
the ambient air
inside a cleanroom. According
to their size distribution, the residual concentration of particles
after filtration is
an ISO Class in
compliance with ISO 14644-1.
Image: M+W Group
Application of a calibration standard to a zinc sulfide crystal
disk. Image: Fraunhofer IPA
Determination of the Resistance of Protective
Clothing Materials to Penetration by Bloodborne
Pathogens — Test Methods Using Phi-X174
Bacteriophage. The classification scale is 1-6 with 6
being the best protection rating.
• ISO 22611, Clothing for Protection Against Infectious
Agents — Test Method for Resistance to Penetration by
Biologically Contaminated Aerosols. The classification
scale is 1-3 with 3 being the best protection rating.
• ISO 22612, Clothing for Protection Against Infectious
Agents — Test Method for Resistance to Penetration
by Biologically Contaminated Dust Through
Protective Clothing Materials. The classification
scale is 1-3 with 3 being the best protection rating.
• EN 14126 Annex A, Resistance to Penetration by
Infectious Agents Due to Mechanical Contact with
Substances Containing Contaminated Liquids. The
classification scale is 1-6 with 6 being the best protection rating.
It is recommended that both the garment material
and the garment seams be tested by an independent
third party lab that is ISO 17025 accredited.
The author acknowledges and thanks the contributions from Amy Dobbins, Research & Development/
Technical Manager, and Dan Edwards, Vice President of
Lakeland Industries Inc.
Jan Eudy is a Cleanroom/Contamination Control
Consultant as well as a Fellow and Past President, Institute
of Environmental Sciences and Technology. She is located
in Carolina Beach, N.C. and can be reached at janeeudy@
continued from pg. 15
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