Spraying in cold weather without losing ratio
Cold is mostly a temperature-management problem, not a chemistry one. Keep drums conditioned before the truck moves, not after you arrive. A-side and B-side that sit at different temperatures is the most common cause of off-ratio foam in winter. Watch hose temperature at the gun rather than the machine display, and give the primary heaters […]
How to choose a proportioner
Start with output, not price. Rate a machine by pounds per minute at the pressure you actually spray, then match it to how many guns run at once. One gun on a large machine is fine; two guns on a small one starves both. Check the electrical service before anything else. Primary heaters and hose […]
Open-cell vs closed-cell foam: which one to spray
Open-cell foam cures at roughly half a pound per cubic foot and gives about R-3.6 to R-3.9 per inch. It stays vapour permeable, so an assembly can dry, and it costs less per board foot. Closed-cell cures around two pounds per cubic foot, delivers roughly R-6 to R-7 per inch, acts as its own vapour […]