Manufacturer: United States Gypsum Company (Chicago, Illinois) Product Category: Acoustical Ceiling Tile

Product Description

United States Gypsum Company (USG) was the largest manufacturer of gypsum wallboard, joint compound, plaster, and acoustical ceiling products in the United States throughout the twentieth century. USG’s Acoustone line — including Acoustone 180 and related Acoustone-family patterns — comprised the company’s flagship mineral-fiber acoustical ceiling tile products, installed in schools, hospitals, office buildings, retail spaces, and institutional interiors from the 1940s onward.

Plaintiffs alleged in publicly filed U.S. asbestos personal-injury and wrongful-death litigation that USG acoustical ceiling tile manufactured during the pre-regulatory era allegedly incorporated chrysotile asbestos into the mineral-fiber tile matrix. According to allegations in publicly filed litigation records, chrysotile was allegedly used as a reinforcing and dust-binding fiber to improve the tile’s dimensional stability, sag resistance, and surface durability while preserving the porous surface texture that gave the product its sound-absorbing properties. USG’s asbestos-containing acoustical tile was allegedly sold in both lay-in suspended-grid formats and in tongue-and-groove nail-up formats.

Documented asbestos-use period, according to publicly filed litigation records: approximately 1940s through 1978, after which USG reformulated its acoustical tile lines to remove asbestos.

Trust status: United States Gypsum Company established the United States Gypsum Asbestos Personal Injury Settlement Trust as part of its Chapter 11 reorganization, which pays qualifying asbestos personal-injury and wrongful-death claims.

Workers Exposed

Carpenters and acoustical ceiling installers were the primary trade allegedly exposed to USG acoustical ceiling tile. Publicly filed litigation records allege that installers cut tiles to length with utility knives, coping saws, or hand saws to fit around light fixtures, HVAC supply and return diffusers, sprinkler heads, and column penetrations. Cutting released respirable chrysotile fiber into the installer’s breathing zone at head height.

Drywall finishers and interior finishers worked alongside acoustical crews and were allegedly bystander-exposed to airborne fiber generated during tile cutting on shared interior job sites.

Renovation workers performing tenant fit-outs, ceiling grid modifications, and lighting replacements allegedly disturbed installed asbestos-containing acoustical tile — dropping and re-cutting tiles, drilling anchor points, and creating fiber release during routine building modifications.

Demolition workers removing suspended and nail-up acoustical ceilings during building demolition allegedly generated high concentrations of airborne chrysotile as aged tiles were broken, crushed, and swept into debris piles.

Maintenance workers in schools, hospitals, and commercial buildings allegedly disturbed acoustical tile during pipe repairs, wiring runs, and access to plenum spaces above suspended grids.