Syringe Barrel Filling Techniques
Caution: Do not completely fill syringe barrels.
The optimum fill is a maximum 2/3 of the
barrel capacity and 1/2 of the barrel capacity
when using the EFD blue LV Barrier piston.
For best results, we strongly recommend that
you use a piston as part of your dispensing
system. The white EFD SmoothFlow piston is
appropriate for most fluids and has several
advantages.
• First, vacuum adjustment is less sensitive.
• Second, the piston prevents fumes from
the fluid being exhausted into the work
environment.
• Third, the piston prevents fluid backflow
into the dispenser if the syringe barrel
is inadvertently turned upside down.
• Fourth, the piston makes it easy and
safe to change tips without dripping.
For watery solvents and cyanoacrylates, request the blue EFD LV Barrier piston,
available in 3cc and 10cc sizes. If you are dispensing an RTV silicone and find that
the piston bounces and causes stringing, request the EFD orange, flat wall piston.
Filling procedure for pourable
low and medium viscosity fluids
If the fluid you are dispensing is pourable, take the syringe barrel, twist on an orange
tip cap and pour your fluid in. Insert a white SmoothFlow piston and carefully press
down until it contacts the fluid. The syringe barrel is now ready for use.
Filling procedure for thick fluids
If your fluid is thick or non-leveling, you can spoon it into the syringe barrel with a
spatula. Or, if the fluid comes packed in a 1/10 gallon (300 ml) cartridge, try loading
the barrel with a caulking gun. Then, press the SmoothFlow piston to move the fluid
to the bottom of the syringe barrel and remove trapped air.
Trapped air in thick fluids can lead to drooling and oozing. Also, repetitive air cycles
can bore tunnels through non-leveling fluids, causing spitting and inconsistent
deposits. The SmoothFlow piston eliminates these problems. It prevents tunneling by
providing a barrier to the pulsed-air cycles. And it prevents oozing by responding to
the pressure of trapped air with a slight suck-back movement after the dispense cycle.
Filling the
Syringe
Barrel
13
Remember
For best results, EFD strongly recommends the use of
a piston as part of your dispensing system.
Do not tip the barrel
upside down or lay flat.
This will cause the liquid
to run into the dispenser.
When changing tips
or attaching a tip cap,
snap the safety clip
completely closed to
prevent any dripping
or bubbling.
Open
Closed
If you choose to not use a piston when dispensing
thin fluids, remember these important points.
Fumes cannot
escape.
No air gap when
using the
SmoothFlow
piston.
SmoothFlow piston
prevents fluid backflow.
2/3
maximum
fill
SmoothFlow
piston
caulking gun
2/3 maximum fill