User guide
Dow Building Solutions
25. Re-open the on-off valve located near the filter and
allow the chemical to flow in an appropriate container.
If the chemical flow is unobstructed, the blockage
exists in the chemical hose which must be replaced.
26. If the blockage persists, examine the tank filter. The
arrow on the filter should be pointing away from the
tank. If not, change the filter direction, steps 3141. If
the filter was installed correctly, continue with step 42.
27. Close the on-off valve.
28. Close the chemical tank valve.
29. Open the on-off valve located near the filter to
depressurize the filter.
30. Disconnect the on-off valve from the filter.
31. Disconnect the filter from the chemical tank valve.
32. Reconnect the new filter with the arrow pointing away
from the tank.
33. Reconnect the on-off valve with the swivel to the filter.
34. Tighten all connections with an adjustable wrench.
35. Verify that the on-off valve is closed. The handle should be
perpendicular to the valve.
36. Open the chemical tank valve.
37. Open the on-off valve and allow the chemical to
flow in an appropriate container. If the flow is full,
reconnect the chemical hose and Gun/Hose Assembly
and perform steps 1623. If the flow is weak the problem
exists in the tank. Contact your Dow Sales Representative
for assistance.
Section 11
Yield Notes
Board foot yields are based on the free rise of the total weight of
the chemicals in the tanks. Many factors affect the yield in field
applications.
11.1 Operator Technique
For best results, apply multiple layers of foam. When spraying,
apply one-quarter to one-half inch thickness of uncured foam.
This will produce a one to one-and-one-half inch thickness of
fully cured foam.
11.2 Application
Avoid spraying over rising foam.
11.3 Temperature
To ensure proper chemical mix, reaction, cure, and optimum
yields, chemicals should not be dispensed if the chemical
temperature is below 65°F (18°C). Insufficient operating
temperatures can cause improper mix, extend cure time, and
adversely affect final physical properties and yields.
NOTE: When using polyurethane foam, estimate 30% more foam than is
required. This yield buffer is recommended so that you will not run out of
chemical on a job site.
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