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October 2010

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Subject:
Re: Conformal Coating Board Edges
From:
Inge <[log in to unmask]>
Reply To:
Inge <[log in to unmask]>
Date:
Thu, 21 Oct 2010 23:51:51 +0200
Content-Type:
text/plain
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text/plain (92 lines) 
"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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