Graco VISCON HP 309524L - Manual (Page 13)

Installation
309524L 13
The chart in F IG . 10 shows the effect of temperature in
reducing two fluids to a sprayable viscosity, between 20
and 34 seconds using a No. 2 Zahn cup.
Note that temperature has more of an effect on high
solid fluids than on thin enamels. That is, for the same
10° temperature rise, the viscosity of the high solid fluid
is reduced more than the enamel. This means the high
solid fluid is temperature sensitive, and you need to take
this into consideration when planning your system.
Once the fluid is reduced to about 34 on the chart, vis-
cosity reduction begins to level off and temperature will
not significantly improve sprayability (it only uses more
energy).
F IG . 10: Effect of Temperature on Viscosity
10
20
30
40
50
60
15 25 35 45 55 65 o C
( o F) (60) (80) (100) (120) (140)
App
a
rent viscosity: with
#1 Z
a
hn
cup
Temperature
Typical high-solid paint
Typical enamel paint
nU
1 Typical spray
viscosities
nU
2