Carey Magnesia Block

Product Description

Philip Carey Manufacturing Company produced magnesia block insulation under the Carey brand for industrial markets throughout much of the twentieth century. The product belonged to a class of thermal insulation materials engineered specifically for high-temperature industrial applications, where conventional materials would fail or degrade rapidly. Magnesia block insulation was designed to be fitted around pipes, boilers, tanks, and other industrial equipment operating at elevated temperatures, making it a practical and widely distributed solution in refineries, chemical plants, power generation facilities, shipyards, steel mills, and similar industrial environments.

The block form of the product allowed installers to cut, shape, and fit sections closely around curved pipe surfaces and irregular equipment contours. Sections could be layered to achieve the insulation thickness required by specific temperature ratings. The material was typically finished with an outer jacket of canvas or similar covering, which was secured with wire or banding and sometimes coated with finishing cement to seal joints and protect the underlying insulation from mechanical damage and moisture intrusion.

Philip Carey was a well-established name in the American building materials and insulation industry. The company operated for decades before its eventual acquisition and corporate restructuring, which ultimately connected its product liabilities to the Celotex Corporation and the trust fund established to address asbestos injury claims arising from that corporate lineage.

Asbestos Content

Magnesia block insulation of the type manufactured by Philip Carey was formulated using a mixture of magnesium carbonate and asbestos fiber. Asbestos was incorporated into the product because of its unique combination of properties: it was heat-resistant, chemically stable, and provided reinforcing strength that prevented the relatively brittle magnesia matrix from cracking under thermal cycling and mechanical stress. Without asbestos fiber reinforcement, magnesia insulation would have been far more fragile and less capable of surviving the mechanical demands of industrial service.

The asbestos fiber used in magnesia block products was typically chrysotile, though documentation in litigation and regulatory records indicates that other fiber types were sometimes present depending on the supply chain and manufacturing period. Asbestos content in magnesia block insulations was substantial — the fiber served a structural as well as thermal function. Trust fund documentation and AHERA-era regulatory records recognize magnesia block as an asbestos-containing material, and the product category is well established in occupational disease literature as a significant source of workplace asbestos exposure.

Philip Carey and other magnesia block manufacturers were aware of the industrial use of asbestos in their products throughout the period of manufacture. As scientific understanding of asbestos-related disease developed and regulatory frameworks evolved — including eventual OSHA standards governing occupational asbestos exposure and the Environmental Protection Agency’s AHERA regulations addressing asbestos-containing materials — the legacy liabilities associated with these products became part of the broader asbestos litigation landscape.

How Workers Were Exposed

Industrial workers who handled, installed, maintained, or worked in proximity to Carey magnesia block insulation faced repeated and often prolonged exposure to airborne asbestos fibers. The nature of the product and the environments in which it was used created multiple distinct exposure pathways.

Insulators and pipe coverers were among the most directly exposed trades. Cutting magnesia block to fit pipe diameters and equipment contours released visible dust containing asbestos fibers. Fitting, trimming, and finishing the insulation — tasks performed routinely over entire careers — resulted in sustained inhalation exposure that industrial hygiene measurements from later decades confirmed could reach levels well above permissible exposure limits established by OSHA.

Maintenance and removal workers faced particularly intense exposures. Magnesia block that had been in service for years became brittle and friable. When workers removed aging insulation from pipes and equipment for repairs or replacements, the material could crumble and release concentrated asbestos dust. Re-insulation work required handling both the removed material and new product, compounding the exposure.

Workers in adjacent trades — including pipefitters, boilermakers, millwrights, steamfitters, electricians, and general laborers working on the same job sites — were exposed through the dust generated by insulators working nearby. In confined spaces such as engine rooms, boiler houses, and refinery pipe racks, airborne fiber concentrations could persist for extended periods without adequate ventilation.

Power plant and refinery workers who did not perform insulation work themselves were nonetheless chronically exposed if they worked routinely near pipe systems insulated with magnesia block. Daily proximity to insulated piping, combined with the gradual deterioration of in-service insulation, created background exposure levels that accumulated over careers measured in decades.

The latency period for asbestos-related diseases — including mesothelioma, asbestosis, and lung cancer — typically spans twenty to fifty years from initial exposure, meaning that workers exposed to Carey magnesia block during peak production and installation decades have continued to develop asbestos-related illnesses well into the twenty-first century.

Philip Carey’s corporate history includes acquisition by Celotex Corporation, and the resulting asbestos liabilities from Philip Carey products — including Carey magnesia block — are addressed through the Celotex Corporation Asbestos Settlement Trust. This trust was established as part of the bankruptcy resolution of Celotex Corporation and its related entities, providing a formal mechanism for compensating individuals harmed by asbestos-containing products within the Philip Carey and Celotex manufacturing lineage.

The Celotex Corporation Asbestos Settlement Trust accepts claims from individuals who can demonstrate exposure to covered products and a qualifying asbestos-related disease. Typical claim categories recognized by the trust include:

  • Mesothelioma (the most serious and most compensated disease category)
  • Lung cancer with documented asbestos exposure history
  • Asbestosis and other nonmalignant asbestos-related conditions meeting defined medical and exposure criteria
  • Other asbestos-related diseases as recognized in the trust’s claim resolution procedures

Eligibility for filing generally requires documentation of exposure to a Philip Carey or covered Celotex product, medical diagnosis of a qualifying condition, and compliance with the trust’s claim resolution procedures and deadlines. Claimants are typically assisted by attorneys experienced in asbestos trust fund filings, who can gather employment records, coworker affidavits, union history, and medical records needed to support a claim.

Industrial workers who were exposed to Carey magnesia block insulation — whether as insulators, pipe coverers, maintenance workers, or general industrial laborers working in environments where this product was installed or disturbed — should consult with an asbestos attorney to evaluate whether a claim against the Celotex Corporation Asbestos Settlement Trust, or through related litigation channels, may be appropriate. Because asbestos trust funds and litigation have specific statutes of limitations, timely consultation is important for preserving legal rights.