7
NEVER USE THE FOLLOWING
Aqua Regia Ferric Chloride Iodine
Sodium Azide Sulfuric Acid
6.1 Cleaning
Spills of any chemical, especially those listed above
should be removed as soon as possible and the
stainless steel surface cleaned with mild soapy
water followed by copious rinse with clean water.
Do not use soap filled or any metallic pads. Even
stainless steel pads are to be avoided as they may
destroy the passive film on the surface of the metal
and create crevices that may harbor contamination.
If stubborn stains persist use a plastic light duty
cleansing pad and rub gently in the direction of the
metal grain. If stains continue to persist use one of
the following methods.
WARNING:
THE FOLLOWING CHEMICAL METHODS HAVE
PROVEN SUCCESSFUL BUT EXTREME CARE
MUST BE TAKEN WHEN HANDLING THESE
MATERIALS. ALWAYS WORK IN AN AREA WITH
ADEQUATE VENTILATION. USE THE
PRECAUTIONS OUTLINED IN THE MATERIAL
SAFETY DATA SHEET (MSDS) AND
MANUFACTURER'S INSTRUCTIONS FOR THE
PRODUCT YOU ARE WORKING WITH. FOLLOW
THE PERSONAL PROTECTION INDEX FOUND
IN THE HAZARDOUS MATERIALS
IDENTIFICATION SYSTEM (HMIS) SECTION OF
THE MSDS.
THE USE AND DISPOSAL OF THESE
CHEMICALS MAY BE REGULATED BY YOUR
LOCAL MUNICIPALITY. CONSULT THE
REGULATIONS BEFORE DISPOSING OF THESE
MATERIALS.
1. Bathroom tub and tile cleaners. Available at
supermarkets.
2. Any of a variety of "scale removers" available at
your local supermarket or hardware store.
Generally sold for cleaning coffee makers,
humidifiers and vaporizers.
3. Citric acid based cleaners. Contact your lab
supply dealer.
4. A 15 to 35% phosphoric acid solution. Available
from chemical supply dealers for scale and rust
removal. Allow solution to soak the surface
affected until rust and scale is loosened.
Immediately rinse with copious amounts of clean
water.
5. Oxalic Acid 2% to 5% in warm water. Swab
solution on surface allowing it to remain until
rust is loosened. Immediately flush with copious
amounts of clean water.
6. A mixture of 20% nitric acid and 1.5% hydrofluoric
acid (or hydrochloric acid). Swab solution on
surface allowing it to remain until rust is
loosened. Immediately flush with copious
amounts of clean water.
The above are ranked in order of mild to strong
cleaning agents. Items 5 and 6 should only be
used if severe rust and scale stains have devel-
oped and cannot be removed by any other method.
In any case the chemical should be allowed to do
the cleaning with minimal scrubbing. Always fol-
low the manufacturer's instructions.
6.2 Chamber Disinfecting
Materials known to be effective in disinfecting:
*Household Bleach
*Glutaraldehyde
*Alcohol
Consult with your staff chemist for advice on
using these chemicals.
CAUTION:
ALWAYS RINSE WITH COPIOUS AMOUNTS OF
CLEAN WATER. AIR DRY AND/OR FILL WITH
FRESH WATER AND FOLLOW THE GUIDELINES
IN "WATER" ABOVE.
DISCLAIMER:
The above information is the result of limited inves-
tigation and Precision Scientific makes no claims
as to the suitability to your particular application.
These are intended to be GUIDELINES ONLY.
Consult your staff chemist to determine what works
best in your lab.
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