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• Are there any special wiper data requirements? priced non-woven could be used?
• What are the most critical parameters required in • Can a lighter weight, high performance material
the wiping material: fibers, particles, ions, be substituted?
absorbency, extractables, abrasion resistance, • Can the “value pack” packaging configuration be
ESD? used in place of the stacked packaging configura-
• What chemicals will be used with the wipers: DI tion?
water, IPA, acetone, bleach, etc.? • Can a more economical wiper size be used?
• What size wiper is being used? Is the wiper two • Can improvement in the wiping technique present
ply or one ply? a cost savings?
• What is the basis weight of the wiping material? • Will pre-wetted wipers improve the overall cost?
• Are the wipers used dry or wet? • Should a validated sterile wiper be used instead of
• If the wipers are used wet, how are the wipers autoclaving?
wetted: dipped, Once the key areas have
sprayed, squirted, pre- been analyzed and improve -
wetted? ments identified, the overall
• Are the wipers pre- cost impact should then be
sterilized or determined. Based on the
autoclaved? estimated impact on quality,
• What type of wiping efficiency, yields, and
technique is used in wiper costs, the identified
cleaning? improve ments need to be
• How are the wipers validated and implemented.
currently packaged?
Are their any special Step 5: The Control Phase
packaging require- After the audit process has
ments? been completed and
• How are the wipers improvements have been
stored prior to and defined and validated for
during use? implementation, procedures
• What is the current need to be updated and
wiper usage? personnel need to be
trained on the new materi-
Step 4: The Improvement als or techniques to ensure
Phase proper control of the new
During this phase of the audit, all of the previously materials and process. The training of personnel in
gathered data will be summarized and analyzed for proper wiping techniques is also an area where the
potential cost improvements. This phase of the audit knowledge and resources of the wiper manufacturer
process requires not only a technical understanding of can be very helpful.
the manufacturing process and product but a technical
knowledge of available wiping materials, wiping material COMMON CLEANROOM WIPER USAGE AUDIT
characteristics, and potential packaging configurations. If IMPROVEMENTS
this overall combination of knowledge is not present Based on typical Cleanroom Wiper Usage Audits, the
internally or there is a resource constraint, the leading following cost reduction improvements are among the
cleanroom wiper manufacturers are an excellent most common identified and implemented:
resource. Their many years of experience in multiple
cleanroom environments and processes combined with “Value Pack” Packaging Configuration: The majority of
their extensive knowledge of cleanroom wiping materi- cleanroom wipers purchased are in the stacked pack-
als can be extremely valuable. Key areas that will be aging configuration. “Value Pack” or bulk packaging
analyzed for improvement include the following: allows the end-user to purchase the same material sub-
• Is the wiping material substrate over-specified for strate in the same size with the same performance in a
the environment and processing requirements: more economical fashion. Typical savings can be
using a laundered polyester knit when a lower 10-15% versus standard stacked packaging.

10 June 2009 Controlled Environments www.cemag.us

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