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Standard Operating Procedure for Chemical Handling and StorageStandard Operating Procedure for Chemical Handling and StorageChemical Handling and Storage 0Standard Operating Procedure for Chemical Handling and Storage
EHS-00005 R12
Printed copies are considered uncontrolled. Verify revision prior to use.
DCN1216
CNSE Confidential
Page 10 of 43
7.2.13.2
A maximum number of one (per lab hood or tool) squeeze bottle
containing each specific type of chemical is
allowed at their “point of use"
(outside of storage cabinets) provided that they are in use during that shift.
7.2.13.3
A maximum number of one (per lab hood or tool) tub containing pre-
soaked alcohol wipes is allowed at their "point of use" (outside of storage
cabinets) provided that they are in use during that shift.
7.2.14
Explosion-proof refrigerators that contain chemicals shall, in addition to
having chemical specific labels on their exterior, also contain a labeling
prohibiting the storage of food. Chemicals shall be stored in secondary
containment trays, tubs, or overpack containers inside the refrigerator to
avoid mixing of incompatible materials. See the following, Section 8, on
chemical segregation and separation; and Figures 1 and 2 for proper
segregation distance during storage.
NOTE
: Flammable liquids and solids must be stored in explosion-proof
refrigerators if temperature
–sensitive.
8.
SEPARATION CLASSIFICATION
8.1
The following are the five general classes of chemicals that must not be
intermingled in the same storage cabinet:
Flammables (including combustibles).
Acids.
Bases.
Oxidizers.
Miscellaneous hazards (e.g. phosphorous oxychloride (POCl
3
);
Perchloric Acid; Tetrahydrofuran (THF); boron tribromide (BBr
3
).
8.2
Exceptions to General Separation/ Classification Rules
8.2.1
Inert materials may be intermingled with other materials.
8.2.2
When approved by EHS, some Oxidizers may be stored with Bases,
depending upon the chemical.
8.2.3
Strong mineral acids, which are also oxidizers (e.g. fuming Nitric acid),
must never be stored with organic acids or bases, unless segregated
within the cabinet in separate spill containment trays capable of holding
110 % of the largest container of each material stored.
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