Cutback Adhesive

Cutback adhesive is a black, asphalt-based glue used to bond vinyl-asbestos floor tile and sheet flooring to the subfloor. It's called "cutback" because the asphalt was thinned, or cut back, with a solvent, and asbestos was added as a filler and to add strength. Sanding, scraping, or tearing out old flooring can release asbestos from the dried adhesive.

Origin

The term comes from asphalt technology, where "cutback" bitumen is asphalt thinned with a petroleum solvent so it spreads easily. Asbestos-containing cutback flooring adhesives were common from roughly the 1920s into the 1980s.

Significance in Asbestos Context

Cutback adhesive is a frequently overlooked source of asbestos exposure, especially for flooring installers, maintenance workers, and homeowners who removed or replaced old floors. When the dried black mastic is scraped, sanded, or ground during renovation, it can release fibers into the air. For a patient trying to pin down where exposure happened, identifying cutback adhesive in a home, school, or workplace can connect a specific product to the disease. Because it's so common in older buildings, it's worth flagging any flooring or renovation work in an occupational or home-exposure history.

Example Sentence

When he pulled up the vinyl tile in his 1960s kitchen, the black cutback adhesive underneath turned out to contain chrysotile, a likely source of his exposure.

Related Terms

Vinyl-Asbestos Tile, Mastic, Chrysotile, Product Identification, Occupational Exposure

Notes

• Do not sand, grind, or dry-scrape old black flooring adhesive; have it tested by a certified lab before any removal.
• If you're documenting exposure, note the building's age, any flooring work, and keep photos or product samples where safe to do so.
• Renovation and DIY flooring work are legitimate exposure sources; include them in your occupational and home history.