Take a look at a page from Georgia-Pacific (known for paper towels in public restrooms, of course, but is understood better as a “wood chemicals” company): Georgia-Pacific Chemicals. read more
There it says, “Urea-formaldehyde resins are used in the production of composite panel products such as medium density fiberboard (MDF) and particleboard (PB)” and, “A line of our UF resins is used in industrial abrasives applications including sandpaper, scrub pads, grit wetting agents, and bonded abrasives. read more
Urea-formaldehyde foam insulation (UFFI) dates to the 1930s and made a synthetic insulation with R-values near 5.0 per inch. It is a foam, like shaving cream, that is easily injected or pumped into walls. It is made by using a pump set and hose with a mixing gun to mix the foaming agent, resin and compressed air. read more