About Mallinckrodt Chemical — St. Louis

Mallinckrodt Chemical / Mallinckrodt Inc. was founded in 1867 by Edward and Otto Mallinckrodt and operated a major industrial manufacturing complex in North St. Louis, Missouri (Destrehan Street area). The facility’s primary operations included pharmaceutical manufacturing, specialty chemical production, industrial solvents and distillation, medical imaging agents, and nuclear materials processing. The North St. Louis campus became one of Missouri’s largest industrial manufacturing centers. At peak production, workers allegedly encountered asbestos-containing materials throughout the facility during routine maintenance, equipment repair, and construction projects.

Chemical manufacturing at Mallinckrodt’s scale required high-temperature reactors, high-pressure piping systems, distillation columns, furnaces, and boiler houses. From the 1920s through the late 1970s, engineers routinely specified asbestos-containing materials for thermal insulation on steam and process piping, fire-resistant structural protection, gasketing and sealing materials, refractory materials lining furnaces and kilns, spray fireproofing on structural steel, valve packing materials, and roofing felts and insulating boards.

Major campus expansions during the 1920s and 1930s allegedly involved installation of boiler systems and steam distribution networks incorporating pipe covering and block insulation, refractory materials in process furnaces and kilns, spray fireproofing on structural steel in older process buildings, and gaskets and sealing materials throughout chemical processing units. Accelerated uranium processing and chemical production during World War II and the postwar expansion (1942–1960) drove rapid facility expansion with new construction introducing asbestos-containing materials throughout boiler houses, steam distribution lines, high-pressure process piping systems, electrical insulation and cable jackets, and refractory installations in high-temperature reactor areas.

During the peak industrial use period (1960–1978), routine maintenance, repair, and renovation kept workers in regular contact with asbestos-containing materials as aging steam lines were repaired or replaced, maintenance on pressurized piping systems disturbed asbestos-containing gaskets, boiler and refractory work continued as equipment aged, and insulators, boilermakers, and maintenance personnel repeatedly disturbed legacy insulation that had been in place for decades. After regulatory action in 1972 (EPA ban on spray-applied asbestos fireproofing) and 1978 (OSHA asbestos standards), new asbestos-containing material installation declined sharply, but existing materials remained in place throughout the facility and renovation, pipe repair, and equipment replacement continued to disturb those legacy materials.

General Equipment at Mallinckrodt Chemical — St. Louis

The equipment below represents the systems and infrastructure documented or typically present at this facility during the era when asbestos-containing materials were specified in industrial construction. This is general facility-equipment reference — not a legal attribution of any specific product, manufacturer, or exposure event to this facility. Material-category and manufacturer information is addressed in the AsbestosIndex Product Crosswalk linked under the records table below.

Reactor Vessels View crosswalk › Process Boilers View crosswalk › Industrial Mixers View crosswalk › Heat Exchangers View crosswalk › Cooling Towers View crosswalk › Pipe Insulation View crosswalk › Valves View crosswalk › Gaskets View crosswalk › Storage Tanks View crosswalk ›

Documented Asbestos Evidence — Missouri

The records below are verified, state-documented asbestos removals at this facility. Each entry represents a regulated abatement project where the Missouri Department of Natural Resources (Missouri DNR) was notified under federal NESHAP rules, the work was logged, and the asbestos-containing material was confirmed and removed under regulated conditions. These are not allegations or estimates — they are paper records tying documented asbestos-containing material to this specific site.

No Missouri DNR NESHAP abatement notifications have been identified for this facility in current public records. Per the framing above, absence of state-agency documentation should not be read as absence of asbestos — only as absence of a formal, regulated abatement event meeting reporting thresholds. Workers who recall encountering pipe insulation, block insulation, gaskets, or other asbestos-era construction materials at this facility may still have viable claims regardless of whether a state record exists.

Material Categories in Documented Records

The materials documented above (and similar asbestos-containing materials commonly encountered in records of this type) appear in the AsbestosIndex catalog with historical manufacturer and trust-fund information. Click a category to view manufacturers historically associated with that material:

Thermal System Insulation View crosswalk › Asbestos-Cement Board View crosswalk › Pipe Insulation View crosswalk › Roofing & Flashing View crosswalk › Spray Fireproofing View crosswalk › Floor Tile & Mastic View crosswalk › Ceiling Tile View crosswalk › Gaskets & Packing View crosswalk ›

Who May Have Been Exposed at Mallinckrodt Chemical — St. Louis

Pipe Coverers and Thermal Insulators installed, maintained, and removed pipe covering and block insulation on steam lines and process piping. Cutting, fitting, and stripping asbestos-containing insulation releases extremely elevated airborne fiber concentrations — among the highest measured in any industrial setting. Heat and Frost Insulators Local 1 union members were reportedly on site for decades performing this direct work. Pipefitters and Steamfitters worked on Mallinckrodt’s steam and process piping systems throughout the facility and allegedly worked immediately adjacent to asbestos-containing insulation throughout their careers. Removing and replacing pipe sections wrapped in asbestos-containing materials generated direct, hands-on exposure, and bystander exposure during nearby insulation work is well-documented in occupational health literature. UA Local 562 and other Plumbers & Pipefitters locals reportedly maintained these systems.

Boilermakers maintained, repaired, and replaced boiler systems in powerhouse and process buildings and allegedly encountered refractory materials, insulating cement, and block insulation containing asbestos. Boiler repair and refractory replacement generate substantial airborne fiber concentrations in confined spaces, and both routine maintenance and major overhauls created exposure opportunities. Boilermakers Local 27 members performed this work on site. Maintenance Mechanics and Millwrights serviced pumps, valves, compressors, and rotating equipment across the plant and allegedly came into regular contact with asbestos-containing gaskets and packing materials. Removing and replacing those materials releases respirable fibers directly into the breathing zone, and repeated equipment maintenance over a multi-decade career produced chronic, cumulative exposure.

Laborers and General Maintenance Workers performed support roles in construction, maintenance, and renovation projects and experienced bystander exposure while tradespeople worked with asbestos-containing materials nearby. Cleanup and waste-removal duties put them in direct contact with contaminated debris. Chemical Operators and Production Workers were stationed at or near process equipment insulated with asbestos-containing materials and experienced chronic low-level bystander exposure over years or decades at their assigned posts. Additional exposure occurred during equipment startup, shutdown, and maintenance cycles.

Missouri — Filing Deadline & Next Steps

Missouri law gives mesothelioma and asbestos-disease claimants 5 years from the date of medical diagnosis to file a personal-injury lawsuit (Mo. Rev. Stat. § 516.120). For wrongful-death claims after an asbestos-related death, the filing window is 3 years from the date of death (Mo. Rev. Stat. § 537.100). The two deadlines run on separate tracks — preserving one does not extend the other.

The personal-injury clock runs from diagnosis, not from exposure. Mesothelioma latency is typically 20 to 50 years, so workers exposed in the 1950s–1980s are being diagnosed today.

Practical first steps

  1. Document what you remember. Pay stubs, W-2s, union cards, photographs, coworker names, and dates of employment. The WorkChain widget on this page can save a copy you can email yourself.
  2. Preserve medical records. Pathology reports, biopsy results, imaging, and pulmonary-function tests are central to both civil claims and trust-fund filings.
  3. Identify household members. Spouses who laundered work clothing and children of plant workers are eligible for secondary-exposure claims when diagnosed with an asbestos-related disease.
  4. Speak with an asbestos attorney with Missouri experience. The first conversation is free and confidential. Asbestos trust-fund claims and civil claims run on different tracks — both can be pursued in parallel.

Asbestos-Related Diseases — Missouri

Asbestos fiber exposure can cause several specific diseases that typically appear decades after the original exposure. The latency period — the gap between exposure and diagnosis — usually runs 20 to 50 years. That's why workers exposed in the 1960s, 1970s, and 1980s are receiving diagnoses today.

Mesothelioma

A rare, aggressive cancer that affects the lining of the lungs (pleural mesothelioma), abdomen (peritoneal), or heart (pericardial). Mesothelioma is almost exclusively caused by asbestos exposure, which is why a mesothelioma diagnosis often points directly to historical workplace exposure. Average latency from first exposure to diagnosis is 30-50 years.

Asbestosis

A chronic, non-cancerous scarring of lung tissue caused by inhaled asbestos fibers. Asbestosis causes progressive shortness of breath, persistent cough, and reduced lung function. It does not improve with treatment, and it is a recognized basis for a claim under most trust schedules and civil claims.

Lung Cancer

Asbestos exposure significantly increases the risk of lung cancer, particularly when combined with a history of smoking. Asbestos-related lung cancer is compensable under the same trust schedules and civil claim avenues as mesothelioma.

Other Recognized Diseases

Pleural plaques, pleural thickening, laryngeal cancer, ovarian cancer, and certain gastrointestinal cancers are also recognized as asbestos-related under various trust schedules and case-law authorities, though eligibility and proof requirements vary by claim type.

If you have any of these diagnoses and you worked at this facility, lived with someone who did, or were exposed in any documented capacity, you may have a claim worth pursuing. Speak with an attorney before assuming you don't qualify.

Data Sources — Missouri

Information about facility equipment, industrial materials, and occupational records referenced on this page is drawn from publicly available sources where applicable, including:

If specific equipment or product claims in this article are sourced from a non-public database, the source is identified parenthetically within the text above.