Some of window washing fluid can be used for plant food as well (I did). In the city, along with the big shopping window display, you can have fair amount of the smelly stuff.
--------------------------
Sent using BlackBerry
----- Original Message -----
From: Douglas Pauls [mailto:[log in to unmask]]
Sent: Friday, October 22, 2010 10:26 AM
To: [log in to unmask] <[log in to unmask]>
Subject: Re: [TN] Conformal Coating Board Edges
Yes, I remember Dave Douthit. I did not always agree with his approaches
to things, but he did have some interesting data.
The indoor NH3 is not that hard to fathom. Most of your industrial
cleaning solutions, especially for glass, have some ammonia in it, so PPB
levels of NH3 are not unusual. If you are anywhere in the Midwest in the
United States, anywhere from April to June, farmers are planting fields
and most apply anhydrous ammonia during the process. I am betting Iowa is
a whole lot higher in NH3 during that time than the PPB range.
Doug Pauls
Inge <[log in to unmask]>
Sent by: TechNet <[log in to unmask]>
10/21/2010 04:51 PM
Please respond to
Inge <[log in to unmask]>
To
[log in to unmask]
cc
Subject
Re: [TN] Conformal Coating Board Edges
"Second, how do you determine how harsh an environment has to be in order
to coat the edges? "
Dough Pauls
Answer:
Do you remember David Douthit? His definition of Harsh was environments
that belong to the upper range of the values in the 'OUTDOOR' column. His
work. There exist no true formulas, but the values below shall in
principle be multiplied with Temperature, Time, barometric pressure and
local weather conditions (sun radiation for example). We have in principle
followed similar figures.
Concentration of selected gaseous air constituents (ppb) in the United
States.
OUTDOOR
O3 4-43
H2O2 10-30
SO2 1-65
H2S 0.7-24
NO2 9-78
HNO3 1-10
NH3 7-16
HCL 0.18-3
CL2 0.005-0.08
HCHO 4-15
HCOOH 4-20
INDOOR
O3 3-30
H2O2 5
SO2 0.3-14
H2S 0.1-0.7
NO2 1-29
HNO3 3
NH3 13-259
HCL 0.05-0.18
CL2 0.001-0.005
HCHO 10
HCOOH 20
There is one thing I don't understand: NH3 up to 259 ppb indoor.
Hope this gave you at least an idea.
/Inge
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