Crusher & Grinding-Mill Linings — Asbestos Exposure Crosswalk
What This Equipment Is
Industrial crushers and grinding mills reduce raw rock, ore, clinker, and other bulk materials to specified particle sizes. The major equipment categories include:
- Jaw crushers — primary crushers receiving run-of-mine material
- Cone / gyratory crushers — secondary and tertiary crushers
- Hammer mills — impact reduction for cement, limestone, agricultural products
- Ball mills and rod mills — fine grinding in mineral processing and cement plants
- Roller mills — vertical-spindle mills (closely related to power-plant Coal Pulverizers)
These machines run heavy duty, often around the clock. They are heavily lined with manganese steel wear plates (the working surface — not asbestos), bedded against back-up materials that historically used asbestos-bearing composites. Bearings are large, gasketed, and historically used asbestos shaft packing where rotating shafts entered grease-or-oil-filled housings. Drive systems used brake bands and clutch assemblies (see Brake Linings, Clutch Facings).
Asbestos Products Historically Used Around Crushers / Mills
| Product Category | Where on the Crusher | Notes |
|---|---|---|
| Wear-plate back-up material | Behind manganese-steel liners | Asbestos cement and millboard composites |
| Bearing-housing gaskets | Main-shaft bearing housings | Asbestos sheet gasket material |
| Shaft packing | Where shafts penetrate process housings | Braided asbestos rope packing |
| Drive-system brake bands | Mill drives, conveyor-feed brakes | See Brake Linings |
| Surrounding pipe / equipment insulation | Heated services (cement plants) | Pipe covering, block insulation |
| Dust-collector gaskets | Bag-house / cyclone connections | See Bag Houses |
Why Crusher / Mill Work Was an Asbestos Exposure Pathway
Liner replacement is a major recurring maintenance event. Each reline involves removing the worn manganese plates, exposing the back-up material, and installing new liners. Disturbance of the back-up layer during this work releases legacy asbestos fiber. Bearing rebuilds, brake-band replacements, and dust-collector maintenance all add to the cumulative exposure for crusher-and-mill maintenance crews.
In cement plants particularly, the combination of raw-mill, finish-mill, and rotary-kiln work (see Industrial Furnaces) concentrated multiple asbestos product families in a single facility.
Manufacturers Named in Litigation Involving Crusher / Mill Components
- Allis-Chalmers — crusher and mill OEM named in installation/maintenance claims
- Nordberg — crusher OEM
- Pennsylvania Crusher — crusher OEM
- Birdsboro Corporation — crusher OEM
- Fuller Company — cement-plant equipment
- Johns-Manville — gasket and insulation products
- Garlock Sealing Technologies — gaskets and packing
- A.W. Chesterton — packing
Documented Product References
Images sourced from publicly available product-identification reference materials. Inclusion does not constitute a finding of liability against any company.
Trust Funds That May Apply
- Manville Personal Injury Settlement Trust
- Garlock Sealing Technologies LLC Asbestos PI Trust
- Owens-Corning / Fibreboard Asbestos PI Trust
Trades Most Exposed at Crusher / Mill Work
Mill mechanics and millwrights, crusher-reline crews, mining mechanics, cement-plant mechanics, contract heavy-equipment rebuild crews.
Jobsites in the Network
- Cement plants, aggregate operations, and mining operations across the state-site network
- See companion pages: Coal Pulverizers, Mine Ventilation, Conveyor Belts, Industrial Furnaces
Compiled from publicly filed asbestos litigation, MSHA / OSHA inspection records, and industry-publication histories. Product and company references reflect what has been alleged or documented in publicly filed litigation. This page does not constitute a finding of liability against any company. Not legal advice; consult a licensed attorney about your specific situation.