Standard Operating Procedure for Chemical Handling and Storage
EHS-00005 R12
Printed copies are considered uncontrolled. Verify revision prior to use.
DCN1216
CNSE Confidential
Page 9 of 43
7.2.5
Metal chemical storage cabinets must be of approved double-walled
construction and minimum 18 gauge steel.
7.2.5.1
Corrosives cabinets (especially those used for storing nitric and/or
sulfuric
acids) are exempted from this provision. HDPE or similar engineered
plastic materials provide better resistance to corrosion in the event of a
spill of those materials.
7.2.6
All wiring within flammable cabinets or explosion proof refrigerators must
be in accordance with the National Electrical Code.
7.2.7
Specific Chemical hazard labels for each chemical must be attached to
the exterior of the cabinet. If a number of different chemicals are stored in
a cabinet, a listing of the current inventory on a removable sheet that can
be updated regularly will be acceptable. The list shall be updated when
each new chemical is added or the use of a listed chemical is
discontinued. Separation of incompatible materials must be maintained.
See Appendix B - Figure 2 for list of incompatible chemicals.
7.2.8
All chemical storage cabinet doors must be self-closing and latching.
7.2.8.1
Acid cabinets (especially those used for storing strong mineral acids) are
exempted from this provision.
7.2.9
The bottoms of cabinets utilized for the storage of liquids shall be liquid-
tight to a minimum height of 2 inches.
7.2.10
No mechanical or electrical equipment shall be stored on top of or
inside
chemical storage cabinets.
7.2.11
No chemicals shall be stored above eye level in a cabinet or lab hood, or
on the floor
in any laboratory, cleanroom or maintenance area.
7.2.12
Storage cabinets in laboratories and cleanroom areas shall be cleaned out
and wiped down with a suitable cleaning agent at a minimum annually.
This shall be coordinated by the Cleanroom / Lab Manager, tenant (tool
owner/operator) or individuals responsible for the storage area. All
chemicals in storage for over a year should be carefully reviewed for
chemical purity and continuing need, and if no longer viable, dispose of as
hazardous waste.
7.2.13
Exceptions to Section 7.2
7.2.13.1
Chemicals may be stored on chemical carts
in the NanoFab South Annex
(NFSX) chemical transfer areas provided that they are either in the
process of being used, or properly stored within same shift.