Herculaneum Smelter Asbestos Exposure: What Workers and Families Need to Know

Urgent Filing Deadline: Missouri law gives you 5 years from diagnosis to file an asbestos claim. If you or a family member worked at the Herculaneum smelter and has been diagnosed with mesothelioma, asbestosis, or lung cancer, that clock is already running. Call a Missouri asbestos attorney today.

A Century of Lead Production — and a Hidden Asbestos Crisis

For over 100 years, the St. Joseph Lead Company’s smelter in Herculaneum, Missouri processed raw ore into refined lead, employing hundreds of workers across dozens of industrial trades. Lead contamination has drawn public attention. What hasn’t: the asbestos exposure that ran through every level of smelter operations, reaching insulators, pipefitters, boilermakers, electricians, millwrights, and maintenance workers across decades.

Workers at Herculaneum were allegedly exposed to asbestos-containing products manufactured by Johns-Manville, Owens Corning, Owens-Illinois, Garlock Sealing Technologies, Armstrong World Industries, W.R. Grace, Georgia-Pacific, Crane Co., and Combustion Engineering — companies that are alleged to have known of the health hazards and said nothing.

If you or a family member worked at Herculaneum and developed mesothelioma, asbestosis, or lung cancer, a Missouri asbestos attorney can help you pursue claims against those manufacturers. This guide covers what we know about asbestos at Herculaneum, the diseases it causes, and your legal options.

Part One: The Facility and Its Operations

St. Joseph Lead Company and the Herculaneum Smelter

The Company

Founded in the mid-nineteenth century as the largest lead producer in the United States
Headquartered in New York
Operated extensive mining across southeastern Missouri’s Old Lead Belt — Bonne Terre, Flat River, Desloge
Required a major smelting facility near Mississippi River transportation infrastructure

The Location

Situated in Jefferson County, approximately 25 miles south of St. Louis
Began operations in the early twentieth century
Operated continuously as the last remaining primary lead smelter in the United States until closure in 2013

Ownership

1971: Merged with Amax Inc. to form St. Joe Minerals Corporation
Mid-1980s: Transferred to Fluor Corporation
1994: Acquired by Doe Run Company
2013: Closed

What Happened Inside the Complex

Herculaneum was a primary lead smelter — raw galena ore in, refined lead metal out, through extreme heat and aggressive chemistry. The complex included:

Sintering plants — partial oxidation of ore
Blast furnaces — operating above 2,000°F
Drossing kettles and refining furnaces — impurity removal from molten lead
Casting operations — refined lead poured into pigs and ingots
Acid plants — sulfur dioxide byproducts converted to sulfuric acid
Boiler and steam systems — energy distributed throughout the complex
Maintenance shops and fabrication areas

Every one of those operations ran on extreme heat. Protecting equipment and workers from that heat created massive, sustained demand for thermal insulation, gaskets, refractory materials, and fireproofing — and for decades, those products contained asbestos.

The Workforce and Union Representation

At peak operation, Herculaneum employed hundreds of direct workers plus contractors and skilled tradespeople. The workers with the heaviest asbestos exposure — those who mixed, applied, cut, and disturbed asbestos products daily — belonged to Heat and Frost Insulators Local 1 (St. Louis), Plumbers and Pipefitters UA Local 562 (St. Louis), and Boilermakers Local 27 (St. Louis).

The full workforce included:

Insulators — Heat and Frost Insulators Local 1 members applying and removing pipe insulation, block insulation, and boiler coverings
Pipefitters — UA Local 562 members installing and maintaining steam and process piping covered with asbestos products
Boilermakers — fabricating and repairing boiler systems lined with asbestos insulation and refractory materials
Electricians — installing wiring and equipment alongside asbestos-containing thermal insulation
Millwrights — maintaining machinery requiring asbestos-containing gaskets and packing
Maintenance workers and laborers — general repair work involving constant asbestos disturbance
Bricklayers and refractory workers — mixing and installing asbestos-containing refractory cements
Furnace workers — laboring in areas where asbestos insulation and refractory materials generated sustained airborne fiber exposure

If your trade isn’t on this list, that doesn’t mean you weren’t exposed. Workers in proximity to any of these operations may have been exposed to asbestos fibers released by others’ work.

Part Two: When and Why Asbestos Invaded the Facility

Why Asbestos Was the Industry Standard

Asbestos wasn’t incidental to smelting operations — it was a deliberate engineering choice driven by thermal demands no other affordable material could meet. The same heavy asbestos use characterized comparable Missouri and Illinois facilities: the Labadie Energy Center (Ameren UE, Franklin County), Portage des Sioux Power Plant (Ameren UE, St. Charles County), Rush Island Energy Center (Ameren UE, Jefferson County), Granite City Steel/U.S. Steel (Granite City, IL), Laclede Steel (Alton, IL), Monsanto Chemical (Sauget, IL), and the Shell Oil/Roxana and Clark refineries in Wood River, IL.

At Herculaneum, where blast furnaces reached temperatures capable of melting rock and superheated steam ran through miles of piping, asbestos appeared in virtually every high-temperature application because:

No commercially viable substitute existed for most of the twentieth century
It provided extraordinary thermal insulation at low cost
It was completely fire-resistant and chemically durable in corrosive industrial environments

What the manufacturers knew: Internal records produced through decades of litigation discovery show that Johns-Manville, Owens-Illinois, W.R. Grace, Armstrong, and other major manufacturers possessed documentation of asbestos health hazards dating to the 1930s. They did not share that knowledge with workers, unions, facility engineers, or plant managers.

Timeline: Asbestos Exposure at Herculaneum (1930s–2013)

Pre-1940s through 1950s Asbestos use was extensive and completely unregulated. Johns-Manville, Owens-Illinois, W.R. Grace, and other manufacturers allegedly possessed internal records documenting health hazards — records they did not disclose. Kaylo pipe covering, Johns-Manville block insulation, Garlock gasket materials, and asbestos-containing refractory products were standard throughout the facility. Workers in Local 1 and Local 562 mixed, applied, and disturbed these materials daily with no respiratory protection and no enforceable exposure limits.

1960s Asbestos product use remained at high volume. OSHA did not yet exist. Workers handled Kaylo, Unibestos pipe covering, Pabco products, and asbestos-containing refractory materials with no meaningful safety precautions. Cutting Garlock and Cranite compressed asbestos gaskets released visible fiber clouds. Local 1 and Local 562 members had direct, sustained daily contact.

1970s OSHA was established in 1970. The first asbestos exposure limit was set in 1972 — by which point thousands of Herculaneum workers had already accumulated decades of unprotected exposure. Asbestos-containing products installed in prior decades remained throughout the facility. New asbestos-containing products continued to be installed even as regulations tightened.

1980s New asbestos installation by major manufacturers declined substantially, but maintenance, repair, and turnaround work involving legacy Kaylo insulation, Johns-Manville block, Garlock gaskets, and A.P. Green refractory products (manufactured in Mexico, Missouri) created massive fiber release. Workers removing insulation, replacing gaskets, and rebricking furnaces during maintenance shutdowns experienced some of the heaviest exposures of the entire operational history.

1990s through Closure (2013) Remediation and abatement work continued alongside ongoing maintenance involving legacy asbestos materials. Products manufactured by Johns-Manville, Owens Corning, Garlock, and others continued posing exposure risks through the facility’s final years.

The bottom line: Any worker at Herculaneum from the 1930s through closure — and particularly insulators and pipefitters in Heat and Frost Insulators Local 1 and UA Local 562 — may have been exposed to asbestos-containing products manufactured by Johns-Manville, Owens-Illinois/Owens Corning, Garlock, Armstrong, W.R. Grace, Crane Co., and others at levels now known to cause mesothelioma, asbestosis, and lung cancer.

Part Three: The Asbestos Products at Herculaneum

Winning an asbestos claim requires proving that specific products from identifiable manufacturers were present at the facility. Based on the smelter’s operations and asbestos product usage patterns documented at comparable Missouri industrial facilities — including the Labadie Energy Center, Portage des Sioux Power Plant, Rush Island Energy Center, and Granite City Steel — the following asbestos-containing products were used at Herculaneum.

Pipe Covering and Thermal Insulation

The facility operated miles of steam, hot water, and process piping. Insulators in Heat and Frost Insulators Local 1 covered that piping with asbestos-containing insulation — calcium silicate blocks, pre-formed pipe sections, and asbestos-containing cement finishing coats.

Products documented at Herculaneum and comparable facilities:

Kaylo (Owens-Illinois/Owens Corning) — One of the most widely distributed asbestos insulation products in American industrial history, documented extensively at comparable Missouri power plants and refineries. Owens-Illinois manufactured Kaylo with full internal knowledge that it caused disease. Insulators handling Kaylo experienced direct hand contact and sustained inhalation exposure during both installation and removal.

Johns-Manville pipe insulation and block insulation — The largest asbestos insulation manufacturer in the United States. Johns-Manville calcium silicate products were standard at smelting operations and documented at Herculaneum and comparable facilities throughout Missouri and Illinois.

Unibestos pipe covering (Pittsburgh Corning Corporation) — Documented at numerous Midwest industrial facilities with operational profiles similar to Herculaneum, including heavy steam and process piping systems requiring sustained high-temperature insulation.

Pabco insulation products (Fibreboard Corporation) — Widely used at Missouri and Illinois industrial facilities during the mid-twentieth century; standard for boiler and pipe insulation applications at high-temperature smelting operations.

Armstrong block and pipe insulation — Armstrong World Industries produced asbestos-containing insulation products distributed throughout Missouri industrial facilities during the period of heaviest exposure at Herculaneum.

Gaskets, Packing, and Sealing Materials

Every pump, valve, flange, and piece of process equipment at Herculaneum required sealing. Pipefitters in UA Local 562 and maintenance workers cut, trimmed, and installed gaskets constantly — releasing asbestos fibers in the process.

Garlock compressed asbestos sheet gaskets and packing (Garlock Sealing Technologies) — Garlock products were among the most prevalent asbestos-containing gasket materials at Missouri and Illinois industrial facilities. Cutting Garlock sheet gaskets to fit released concentrated asbestos fiber clouds directly into workers’ breathing zones. Garlock has established an asbestos bankruptcy trust that may provide compensation to exposed workers.

Cranite sheet gaskets (Johns-Manville) — Standard compressed asbestos gasket material used at Herculaneum and comparable facilities; cutting and trimming operations produced significant fiber release.

Flexitallic spiral-wound gaskets — Used at high-temperature, high-pressure

Litigation Landscape

Asbestos exposure at industrial smelting and lead processing facilities like the St. Joseph Lead Company complex has generated documented litigation against manufacturers of thermal insulation, gaskets, and refractory products commonly used in high-temperature industrial operations. Primary defendants in publicly filed litigation arising from this facility type have included Johns-Manville, Owens-Illinois, Combustion Engineering, Crane Co., W.R. Grace, Garlock, Armstrong, Babcock & Wilcox, and Eagle-Picher—manufacturers whose asbestos-containing insulation blankets, pipe wrap, gaskets, and packing materials were standard equipment in smelting operations during the mid-to-late 20th century.

Workers and their families have pursued claims through multiple asbestos bankruptcy trust funds established by these manufacturers, including the Johns-Manville Personal Injury Settlement Trust, the Owens-Illinois Trust, the Garlock Sealing Technologies Trust, the Armstrong Utilities, Inc. Asbestos Settlement Trust, and the Babcock & Wilcox Nuclear Operations Group, Inc. Asbestos Trust. Each trust maintains distinct claim procedures and eligibility requirements based on the claimant’s documented exposure history and the manufacturer’s historical products present at the facility.

Documented asbestos litigation from industrial smelting and manufacturing facilities has consistently addressed exposure to asbestos-laden dust during equipment maintenance, repairs, and thermal insulation work—occupational exposures characteristic of lead smelter operations. Claims have focused on manufacturers’ failure to warn workers and employers of inhalation hazards associated with their asbestos products in high-temperature industrial settings.

If you worked at the St. Joseph Lead Company smelter complex and have been diagnosed with mesothelioma, asbestosis, or lung cancer, contact an experienced Missouri asbestos attorney to review your exposure history and eligibility for compensation through applicable trust funds and litigation.

Recent News & Developments

Public records and litigation databases reflect a limited but meaningful body of documented activity related to asbestos concerns at the St. Joseph Lead Company smelter complex in Herculaneum, Missouri. While no single high-profile incident dominates recent reporting specific to asbestos at this facility, the site’s long industrial history and its well-documented environmental contamination legacy provide important context for former workers and their families.

Environmental Regulatory Actions

The Herculaneum smelter complex is most prominently associated with lead contamination enforcement actions. The site was listed as a Superfund-related concern by the U.S. Environmental Protection Agency, and Doe Run Company — which later operated the facility following the St. Joseph Lead Company’s corporate history — entered into consent agreements with the EPA and the Missouri Department of Natural Resources addressing soil and airborne contamination in surrounding residential areas. While these enforcement actions centered on lead emissions, large-scale environmental remediation at aging industrial smelter complexes routinely implicates asbestos-containing materials embedded in furnace linings, pipe insulation, boiler lagging, and structural fireproofing — all of which are subject to NESHAP regulations under 40 CFR Part 61, Subpart M, requiring notification and controlled removal prior to demolition or renovation.

Demolition and Decommissioning

The Herculaneum smelter ceased primary lead smelting operations in 2013 following years of regulatory pressure and community health concerns. The closure and subsequent decommissioning of the facility triggered obligations under federal NESHAP standards, which mandate asbestos surveys, proper abatement, and air monitoring before any structural demolition proceeds. Facilities of this era — constructed and expanded throughout the mid-twentieth century — routinely incorporated asbestos-containing materials from manufacturers such as Johns-Manville, Owens-Illinois, Armstrong World Industries, and Babcock & Wilcox in their high-heat industrial equipment, including boilers, kilns, and associated pipe systems.

Litigation Context

Occupational asbestos litigation involving Missouri smelter and heavy industrial workers has produced documented claims in Missouri state courts. Former tradespeople — insulators, pipefitters, boilermakers, and maintenance workers — who performed work at lead smelting facilities in Jefferson County have appeared as plaintiffs in asbestos personal injury dockets in the Missouri Circuit Court system. While no single publicly reported verdict or settlement specific to the St. Joseph Lead Company’s Herculaneum complex has been identified in available public records at the time of this writing, asbestos litigation involving similar Missouri industrial employers has resulted in substantial recoveries for plaintiffs diagnosed with mesothelioma and asbestosis.

Current Regulatory Framework

Ongoing remediation and any future redevelopment activity at the Herculaneum site remains subject to OSHA’s asbestos construction standard at 29 CFR 1926.1101, which governs worker protection during disturbance of asbestos-containing materials at legacy industrial properties.

Workers or former employees of St. Joseph Lead Company smelter complex Herculaneum Missouri asbestos who were diagnosed with mesothelioma, lung cancer, or asbestosis may have legal rights under Missouri law. Missouri § 537.046 extends the civil filing window for occupational disease claims.