Filtering Chemical

Long ago (maybe 45 years) my old company evolved mostly into a spray foam roofing contractor from just an insulator. Because of the iso particles and small size screens, and yes, not doing a good job of sealing the iso drums. This was always a recipe for a pile of disaster. I kept shooting myself in the foot and no one would help to unload the gun. 

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Keep Your Material Warm

Having warm material is very important for spray foaming, however, it is easy to think a few degrees won’t make a difference. It is important for the health of your equipment and the quality of your work to wait for those few extra degrees to get you the best quality 

Remember to always warm up material to the manufacturers recommended temperature to get the best spray! 

Properly Trained Team

Taking time to properly train your team will prevent losses in both time and money. By investing in your employees, you are able to have them run more efficiently and spend less time fixing costly mistakes.

Training doesn’t always have to take a ton of time out of your schedule. Taking one day to train a group of employees on proper equipment handling, maintenance or basic trouble shooting can prevent hours of lost time. Afterall, spending a few hours to train your crew on taking care of equipment can prevent having hours or even days of downtime due to a preventable mistake.

Ventilation at the Job Site

It may seem redundant but, when spray foaming, keep your job site ventilated and do it every single time you spray. Keeping the work area ventilated will prevent unnecessary exposure to fumes and particles that can cause damage to workers. Best practice is to be aware of the airflow and have a source of entry and a way for air to flow out of the work space. Also remember to keep the area ventilated until the re-entry time specified by the foam manufacturer.  

For more information on proper ventilation procedures review the EPA Spray Foam Ventilation Guidelines 

Clean your screen filter

Materials entering the proportioning unit may require screening or filtering. Therefore, manufactures of the spray equipment commonly install y-strainers or filter housings on or near the machine to pre-screen the materials as they are transferred from the storage vessel prior to entering the proportioning unit. Proper cleaning or replacement of the screen filter must be completed daily or as needed to ensure proper material supply is achieved. Clogging and restriction of the screen filter may cause cavitation and/or poorly dispersed product known as off-ratio.
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Choosing a Screen

Machine screens and spray gun screens come in three different sizes; 80, 60, and 40 mesh. Using a larger mesh filter allows smaller particles to pass through your processing system and out the spray tip of the gun. For most polyurethane foam and polyurea, I suggest using 60 or 40 mesh screen to reduce filter clogging.

Cleaning A/B Filters

Sometimes chemical cleaning the A and B filters can leave too much residue and plug up the screen hole. My suggestion? Re-new your filter screens.

You can do it with a few tricks. Try using a light amount of heat from a torch and burn out any restrictions. Once the restrictions are burned off, use air to blow out excess from the screens. Finally, hold your screen up to a light to ensure it is clear and ready to use again.