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more about PERChlor
Thanks to Eddy Zwaneveld for the following excellent information.
--- Forwarded mail from Eddy Zwaneveld <E.HA.ZWANEVELD at NFB-ONF.CA>
The information I provided to you about perchloroethylene film cleaning
and a call I received from one of you, suggests that I might share some more
details, in case you need them.
There are some concerns when using any quatity of solvents in work areas:
1. What do you do when there is a spill?
Your local Safety Supply /Spill Control Supplier, can offer you all-purpose
absorbents, that absorb up to 16 times the weight of the pad, mat or snake-
2. How to signal that there is a spill, other than wait for someone to
An inexpensive product of about $ 30.00, is Flood Alert, made by
Abbeon Cal, Inc., fax: 1-805-966-7659, it sounds an alarm if liquid should
come in contact with the sensor. Also a great thing to have, if your
basement floods occasionally.
Another unit, called the Tankguard Sensor, is made by MSA
<http:www.msanet.com/instruments> or call: 1-800-267-0672 or
Internationally tel (1-412-967-3228 or fax: 1-412-967-3373 for info.
3. Can a vapor detector for perc be mounted in a work area, raise an
alarm when the Permissible Exposure Level is exceeded, and permit the
information to be recorded on a computer?
Yes, MSA, makes a model 3800 Infrared Gas Monitor, or similar from
someone else, it reads over a range of 0 to 1000 parts per million
(ppm). It is easy to install, easy to read the display, has a
sensitivity of 1 ppm.
We have used similar technology, made locally in Quebec for 1,1,1
trichloroethane for years, and it works well.
4. How do you evacuate solvent vapors best?
-Recycle and make sure that there are no leaks, and employees wait
with opening doors until charged air is evacuated.
-Exhaust vapors at the source, aim at half the Permissible Exposure
Level as your target, verify using a Draeger or similar air pump with
a detector tube with reagent for a quick evaluation.
-Adding fresh room air to dilute the smell is inefficient and expensive.
-Refer to Industrial Ventilation, A Manual of recommended Practice,
of the American Conference of Governmental Industrial Hygienists,
they are located in Lansing Michigan, cost about $ 15.00 a copy.
With best regards,
Ed H. Zwaneveld
Technical Research and Development
National Film Board of Canada
125 rue Houde, T-3
Saint Laurent, PQ.
e-mail: e.ha.zwaneveld at nfb-onf.ca
--- End of forwarded message from Eddy Zwaneveld <E.HA.ZWANEVELD at NFB-ONF.CA>