Insulating Cements (Combustion Engineering, 1963–1966)

Product Description

Combustion Engineering, Inc. was a major American industrial manufacturer with significant operations across power generation, nuclear energy, and process industries throughout the mid-twentieth century. Among its product lines during the early 1960s, the company produced insulating cements intended for refractory and high-temperature industrial applications. These insulating cements were engineered to provide thermal protection and structural integrity in furnaces, boilers, kilns, and other industrial equipment operating under extreme heat conditions.

Manufactured between 1963 and 1966, these products served a specific industrial need: maintaining safe and efficient operating temperatures in heavy industrial environments while protecting underlying equipment components from thermal stress. Insulating cements of this era were commonly applied as trowelable or castable materials that workers could shape and apply directly to surfaces, joints, and equipment enclosures. Once cured, the material formed a rigid, heat-resistant layer capable of withstanding the demands of continuous industrial operation.

Combustion Engineering’s insulating cements were part of a broader category of refractory products that were standard materials across American industry during this period. Power plants, steel mills, refineries, chemical processing facilities, and manufacturing plants all relied on refractory insulating cements to maintain operational efficiency and worker safety from heat exposure. The use of asbestos-containing materials in such products was widespread at the time and reflected the industry’s standard practice before the health hazards of asbestos were fully recognized and regulated.

Asbestos Content

Combustion Engineering’s insulating cements produced during the 1963–1966 period contained chrysotile asbestos as a formulation component. Chrysotile, also known as white asbestos, is a serpentine-form mineral fiber that was widely favored in industrial products because of its heat resistance, tensile strength, and binding properties. In refractory cement formulations, chrysotile fibers contributed to both the structural integrity of the cured product and its capacity to resist thermal degradation.

Chrysotile was the most commercially prevalent form of asbestos used in the United States throughout the twentieth century and appeared in a broad range of construction, insulation, and industrial materials. Although chrysotile was historically promoted as less hazardous than amphibole asbestos forms such as crocidolite or amosite, regulatory and scientific consensus has firmly established that chrysotile is a known human carcinogen capable of causing mesothelioma, lung cancer, and asbestosis. The International Agency for Research on Cancer (IARC), the National Toxicology Program, and the Environmental Protection Agency have each classified all forms of asbestos, including chrysotile, as established carcinogens.

In the context of refractory insulating cements, chrysotile fibers were incorporated into the product matrix in a manner that could render them susceptible to release during handling, application, drying, and disturbance. The binding and thermal properties that made chrysotile useful in these formulations also meant that the material was present throughout the cured product, available for fiber release whenever the cement was cut, ground, broken, abraded, or otherwise disturbed.

How Workers Were Exposed

Industrial workers who handled, applied, repaired, or worked near Combustion Engineering insulating cements during the 1963–1966 production window faced potential exposure to airborne chrysotile asbestos fibers. Litigation records document that workers in industrial settings sustained occupational exposures through multiple pathways inherent to the routine use of these products.

The process of mixing dry or semi-dry insulating cement formulations was a recognized source of fiber release. When workers opened bags or containers of cement material, combined the product with water or other binding agents, or poured and transferred the material during preparation, airborne dust containing asbestos fibers could be generated. In poorly ventilated industrial environments, this dust could remain suspended for extended periods, increasing the duration and intensity of potential inhalation exposure.

Application of insulating cement to furnaces, boilers, pipe fittings, and industrial equipment required workers to trowel, cast, or spray the material directly onto surfaces. This hands-on work placed workers in close proximity to the product for sustained periods and involved physical manipulation that could release fibers into the breathing zone. Workers who spray-applied insulating cements faced particularly significant exposure potential, as this application method generates fine aerosols that carry asbestos fibers deep into the respiratory tract.

Maintenance and repair activities posed additional exposure risks. Refractory linings in industrial equipment require periodic inspection, patching, and replacement. Workers who broke apart, chipped, or ground existing insulating cement during maintenance work disturbed cured material that still contained embedded chrysotile fibers. Plaintiffs alleged that such maintenance exposures could be intense and concentrated, particularly in confined spaces such as boiler interiors, kiln chambers, and process vessel enclosures where ventilation was limited and fiber concentrations could accumulate rapidly.

Co-worker exposure was also a documented concern. Industrial workers generally operating in proximity to cement mixing and application areas—including pipefitters, boilermakers, laborers, and maintenance personnel—could inhale fibers released by colleagues working directly with the product, even without personally handling the cement themselves. Litigation records document that bystander exposure of this kind was characteristic of industrial worksites during the period when these products were in use, as respiratory protective equipment and engineering controls were inconsistently implemented.

Combustion Engineering, Inc. does not have an active asbestos bankruptcy trust fund associated with its insulating cement product line. Individuals seeking legal remedies related to asbestos exposure from these products must pursue claims through civil litigation in the tort system rather than through a trust fund claims process.

Litigation records document that plaintiffs who alleged asbestos-related injury from Combustion Engineering products have brought claims in state and federal courts across the United States. Plaintiffs alleged that Combustion Engineering knew or should have known about the hazards of asbestos-containing products and failed to provide adequate warnings, instructions for safe handling, or protective guidance to workers and employers who used these products.

Diagnosed conditions associated with chrysotile asbestos exposure that have formed the basis of civil claims include mesothelioma (a rare and aggressive cancer of the mesothelial lining of the lungs, abdomen, or heart), lung cancer, asbestosis (a progressive fibrotic lung disease), and other asbestos-related pulmonary conditions. Mesothelioma in particular carries a strong causal association with asbestos exposure and has been the basis for numerous significant litigation recoveries.

Individuals who worked with or around Combustion Engineering insulating cements during the 1963–1966 production period—or family members of deceased workers—should consult with an attorney who specializes in asbestos litigation. Important considerations include applicable statutes of limitations, which vary by state and generally begin running from the date of diagnosis rather than the date of exposure. Documenting occupational history, worksites, and specific product encounters is essential to building a viable claim. Medical records confirming an asbestos-related diagnosis, employment records, and witness testimony from former co-workers all serve as relevant evidence in such proceedings.

This article is provided for informational purposes only and does not constitute legal advice. Persons with potential asbestos exposure claims should seek qualified legal counsel.