4.5 Selecting Nozzles, Needles And Air Caps
The selection chart below is a general guideline of a recommended nozzle, needle and air cap size to use with various
coatings and viscosities for the Apollo 7500 AtomiZer spray guns. Different coatings as well as different brands often have
properties that will work better with an alternative size nozzle and needle or alternative air cap. Most often our standard
recommendation will work perfectly. Other times you might want to experiment with a different combination. (Nozzle and
needle sizes always need to be paired).
Fluid Nozzles, Needle Assemblies, Air Caps & Viscosity
Tip/Needle
Size
Application
Viscosity Zahn #2
Air Cap
0.8MM
(.031)
Inks, Dyes, Stains, extremely thin viscosity fluids, Water based finishes.
16 seconds
A
1.0MM
(.039)
All purpose, thin lacquers, thin enamels, Water based finishes, Automotive,
Marine, Airplane finish.
16—18 seconds
B
1.3MM
(0.051)
Same as 1.0mm above except slightly higher viscosity.
17-20 seconds
B
1.5MM
(.059)
Catalyzed lacquers, Conversion Varnish, Primers, Automotive, Marine,
Airplane finishes, Varnish, High Viscosity Industrial Coatings, Urethanes,
Enamels.
18—24 seconds
B
1.8MM
(0.07)
Same as 1.5mm above except slightly higher viscosity.
20 – 22 seconds
C
2.0MM
(.079)
Thinned latex paint, Multi-spec, Heavy Primers, Butyrate, nitrate dope,
High Viscosity Industrial Coatings.
24—35 seconds
C
2.5MM
(.098)
Thinned latex paint, Multi-spec, Solvent adhesives, Wax based strippers.
35+ seconds
D
In general, a smaller nozzle size would be used for a thin or low viscosity product. This helps control the flow of fluid and
ensure that all of the fluid is properly atomized. As viscosity increases, or higher fluid flow is desired, a larger nozzle/needle
pair is suggested as well as a matching air cap.
Apollo offers two different air cap sets.
Our standard air caps for fine atomization
and distribution of coating (Available in
sizes A, B, C and D) and our HS (High
Solids) air caps designed to increase
nozzle pressure for hard to atomize and
higher solids products.
Standard Air Caps
The HS series is available in sizes B, C
and D. For further assistance please visit
our website at www.hvlp.com or call our
customer service associates at 888-900-
4857 (HVLP).
High Solids Air Caps
Summary of Contents for Apollo 7500 AtomiZer
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