Paul Cherubini cherubini at mindspring.com
Tue Apr 4 07:58:00 EDT 2000

Paul. M. Sammut wrote:

> I have come by about 50cc of pure dichlorovos.
> Can anyone suggest what  dilutant I should use to bring it down to the concentration 
> present in Vapona sticks? I intent to use it on small pieces of cottonwool (one
> drop per cabinet box). Thanks

Truely pure dichlorvos is sold as a 98% liquid manufacturing concentrate.

A 5% end use dilution is applied at the rate of 1 ounce per 1000 cubic feet
in atomizing machines to fog food processing plants here in California.
A Xylene range blend and 1,1,1-trichloroethane have been used as diluents. 

You could extrapolate from these figures about what might be an appropriate amount
to use in a cabinet box. Presumably, rubbing (isopropyl) alcohol could also be used as
a diluent, but is not used commericially in commercial fogging applications
due to its fire hazard (low flash point).

Vapona sticks contain 20% dichlorvos. However, the vapor is released over several
months. By contrast, I would imagine
whatever amount you use on the cottonwool will be gone in a matter of days.

Using a 20% dilution on the cottonwool sounds like it would be far too concentrated.
I'd make a 5% dilution in rubbing alcohol and figure the cubic footage of the cabinet
box and use this dilution at the 1 ounce per 1000 cubic feet rate. (This assumes
you do truly have the 98% pure manufacturing concentrate or technical material).

Paul Cherubini
Vapona salesman

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