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Surfaces that are colder will result in reduced yield. This is caused by the cold surface extracting the heat from the exothermic reaction resulting in a reduced rise, and a reduced yield. If the surface is 40°F (40°C) or colder, the exotherm may also cause condensation, which may cause the foam to not adhere properly. The way to determine if this will happen is to do a test patch. If the foam sticks to the cold surface, spray the thinnest layer possible to simply raise the surface temperature to a level closer to the ideal temperature. Allow that layer to cure. Then add the desired thickness to achieve your required level of insulation.

Surfaces that are too warm may result in the foam curing too fast. This would also result in a reduced yield because the foam would not have enough time to reach the full rise before it fully cures. In addition, extreme cases may result in loss of adhesion because the foam would cure so fast it does not develop a bond to the surface before hardening.

Yield may be affected by operators technique and environmental temperature. It is important to take expansion rate into consideration prior to application. Expansion rate is related to spray rate, area configuration and temperature variations.

Only One Chemical is Dispensing

To assist you in this section, identify the "A" component (red tank) as being the darker brown liquid and the "B" component (white tank) as being white or nearly clear in colour.

If you are experiencing reduced flow of either of the chemicals and you are confident that the temperature of your chemicals and substrate is within the optimum temperature guidelines then there may be a blockage in the gun and hose applicator.

Most often when there is only one chemical coming out of the gun, it will be the "B" component. This is usually caused by not using the gun on a regular basis, causing blocking on one side of the gun. You may dispense foam that seems to be rising, and then it "melts" or reverts to a liquid after a short period of time. This would indicate that there is no "A" component flow at all.

When was the last time you used the system?

We strongly recommend that you USE THE GUN AT LEAST ONCE PER WEEK, more often in humid climates. Failure to do so may result in a blockage on the "A" component side of the gun due to moisture driven crystallisation of the "A" component. If only "A" component is coming out something has occurred to freeze up the "B" component side of the gun. Most likely, the gun and hose assembly had been sitting much too long between applications.