Environment Conditions
Enverge spray foam insulation is designed for best results when sprayed in the following conditions:
Ambient Temp:
Relative Humidity:
Substrate Moisture Content:
When ambient conditions are below 40°F it is necessary to warm and dry the building or substrates.
Chemical Drum Temps
Long Term Storage Temp
Enverge spray foam chemical components have an optimal shelf life of 6 months when stored in unopened containers at:
Hot Room
In colder environments, it is advisable to create a staging room where drums can be heated up to 48 hours prior to use. It is allowable for drum temperatures to reach within 5 - 10 degrees of their below specified Pre-Heat temp in this environment. This helps chemical reach the required pre-heated temperature quicker in the field, reducing the amount of time needed to recirculate and pre-heat chemical.
Pre-Heat Temp
If necessary, circulate the resin and ISO components through heaters to bring chemicals up to temperature. Use gentle mixing to ensure homogeneous temperature throughout the drum. For best results, the resin and ISO should be at the following temperature prior to use:
*VERY IMPORTANT: A recirculation tube is required for closed cell when pre-heating. Dumping chemical into a closed cell drum from the top will lead to foam frothing inside the drum. Chemical must enter at the base of the drum through a recirculation tube. Contact your Enverge rep for more details.
Chemicals that are not recirculated and pre-heated adequately may not be able to reach the correct spray temperatures, even if the proportioner temps are set correctly. See Delta T below for more information.
Pro Tip
Pre-heating chemical can be a time consuming part of the spray foam process. Finding ways to reduce this needed time is extremely valuable. Many rigs are equipped with auxiliary power and heating tools that can be plugged in during extended periods of down time and overnight. Use these auxiliary heating tools to keep your chemicals warmer prior to the pre-heat process, resulting in a shorter period of time needed to reach the required temperature for spraying.
Proportioner Temps
Enverge spray foam is designed to be applied by trained contractors using high pressure, plural component spray proportioners. The A-side, B-side, and Hose Heat must maintain temperatures within the following range for proper results:
Proportioner Pressures
Enverge spray foam is designed to be applied by trained contractors using high pressure, plural component spray proportioners. The A-side and B-side must maintain pressure within the following range for proper results:
A/B Dynamic Pressure:
Ensure at start-up that both A and B pressure gauges equalize from zero to the set pressure. Both gauges should be within 100 to 200 lbs/in² of each other. If there is a pressure imbalance outside this range, off-ratio issues are likely to occur with foam application.
System Delta T
Optimal spray settings will vary with proportioner, hose dimensions, gun configuration and ambient conditions. It is critical for sprayers to understand the limitations associated with their equipment. One of the most critical considerations in colder conditions, is understanding how much your proportioner can heat chemical. Delta T (ΔT) is a measure of the proportioner's ability to increase chemical temperature.
For example, if your starting drum temperature is 60°F and your setup has a Delta T of 50°F, then your proportioner will only be able to heat the chemical to 110°F (60°F + 50°F = 110°F). This is not hot enough to spray and why it is very important to keep drums stored in a tempered environment.
The mixing chamber must also be considered because larger chambers allow for a higher flow rates and a lower dwell time (the amount of time the chemical resides in the heater). A shorter time in the heater mean less time to heat and a lower Delta T. Follow the below steps to estimate the Delta T of your system.
Estimate your Delta T
- Estimate your Flow Rate. This is done by finding where your Mixing Chamber line intersects your Pressure Settings on the below chart. For example, using an AR5252 on a machine at 1200 psi has a flow rate of approximately 2 gpm.
- Use the above determined Flow Rate and find where is intersects your Heater Size on the below chart. For example, if we use the 2 gpm from the above chart and look at line K for a 12 kW heater, we find that our Delta T is approximately 100 degrees.
