Asbestos-Containing Material (ACM)

Asbestos-containing material, or ACM, is any material that contains more than one percent asbestos by weight, as defined by federal regulation. The category covers thousands of building products: insulation, floor tile, joint compound, roofing, cement pipe, and many more. Whether a material counts as ACM determines how it must be handled, labeled, and removed.

Origin

The one-percent threshold was set by the EPA under the Clean Air Act's asbestos NESHAP rule and reinforced by the 1986 Asbestos Hazard Emergency Response Act (AHERA) for schools.

Significance in Asbestos Context

For patients, the ACM label is central to identifying where exposure happened. Building surveys, inspection reports, and abatement records use the term to catalog the materials that had to be tested and managed. Because the one-percent rule can exclude products with lower but still hazardous asbestos content, some materials that harmed workers were never formally classified as ACM at all. Identifying the specific ACM you worked with, and who made it, is what connects your disease to particular manufacturers.

Example Sentence

The building's asbestos survey listed the pipe insulation and floor tile as ACM, matching the materials the plaintiff had cut and installed for two decades.

Related Terms

Friable Asbestos, NESHAP, AHERA, Abatement, Asbestos Survey, Fiber Release

Notes

• Request any asbestos survey, inspection, or abatement records for the buildings and job sites where you worked.
• Remember that "non-ACM" under the one-percent rule doesn't always mean asbestos-free; ask whether lower-content products were present.
• Photographs, product labels, and purchase records help identify the manufacturer of specific ACM.