Pabco Pipe Covering and Block Insulation

Product Description

Pabco pipe covering and block insulation were thermal insulation products manufactured by Fibreboard-Pabco, the insulation and building products division of Fibreboard Corporation. Fibreboard operated under several trade names throughout its history, with the Pabco brand becoming closely associated with a range of industrial insulation products designed for high-temperature applications in refineries, chemical plants, power generation facilities, shipyards, and manufacturing installations across the United States.

Pipe covering referred to pre-formed, curved insulation sections engineered to wrap directly around piping systems of specific diameters, creating a tight thermal barrier around hot or cold lines. Block insulation, by contrast, consisted of flat or shaped rigid sections cut and fitted around irregular equipment surfaces such as boilers, turbines, pressure vessels, tanks, and industrial furnaces. Both product forms were sold as part of Fibreboard-Pabco’s broader insulation line and were marketed to contractors and industrial facilities where managing extreme temperatures was essential to safe and efficient operation.

Fibreboard Corporation was a major participant in the mid-twentieth century insulation market. Its Pabco products competed with similar offerings from manufacturers such as Johns-Manville, Owens-Illinois, and Armstrong. The widespread industrial construction boom following World War II created sustained demand for products like Pabco pipe covering and block insulation, and these materials were installed extensively in commercial and heavy industrial settings throughout that era.

Asbestos Content

Pabco pipe covering and block insulation contained asbestos as a primary functional ingredient. Asbestos mineral fibers—valued for their resistance to heat, flame, and chemical degradation—were incorporated into the binding matrix of these insulation products to give them the physical properties required for industrial service. Pipe covering and block insulation products of this type typically relied on asbestos as a structural component that allowed the material to withstand the continuous thermal stress of industrial piping and equipment without crumbling, cracking, or losing insulating efficiency.

The use of asbestos in insulation products of this class was common industry practice during the decades when Pabco products were actively manufactured and sold. Fibreboard Corporation’s involvement with asbestos-containing products has been extensively documented through regulatory proceedings, corporate litigation, and the establishment of the Fibreboard Corporation Asbestos PI Trust, which was created specifically to address claims arising from exposure to the company’s asbestos-containing product lines, including Pabco-branded insulation materials.

How Workers Were Exposed

Workers who handled, installed, maintained, or removed Pabco pipe covering and block insulation faced exposure to asbestos fibers at multiple stages of the product’s lifecycle. Industrial settings where these products were used were among the most hazardous environments for asbestos fiber release.

Installation workers and insulators were among those with the most direct and sustained contact. Fitting pipe covering required cutting pre-formed sections to length and trimming them to match elbows, flanges, valves, and other fittings. Block insulation required scoring, breaking, and shaping rigid sections to conform to irregular equipment surfaces. Each of these operations—performed without adequate respiratory protection during most of the decades these products were in use—released asbestos dust into the breathing zone of workers performing the task and those working nearby.

Industrial maintenance workers encountered Pabco insulation during routine upkeep and repair of piping systems and process equipment. Accessing pipe joints or equipment components for inspection or repair often required removing existing insulation sections by hand, generating significant fiber release from aged and brittle material. Workers who regularly broke open old insulation covers or stripped block sections from equipment surfaces accumulated substantial cumulative exposure over the course of their careers.

Boilermakers, pipefitters, and steamfitters working in refineries, chemical processing plants, and power stations frequently worked in close proximity to insulated systems. Even workers who did not directly handle the insulation material were exposed as bystander workers when nearby cutting, fitting, or removal work was underway.

Shipyard workers represented another significant exposure population. Naval and commercial shipbuilding relied heavily on pipe covering and block insulation for machinery spaces, engine rooms, and steam lines, and Fibreboard-Pabco products were among those used in shipyard environments during peak production periods.

The risk associated with these products was compounded by the nature of industrial worksites, where multiple trades operated simultaneously in enclosed or poorly ventilated spaces. Asbestos fibers released during insulation work in these environments did not remain confined to the immediate work area, exposing all workers present regardless of their specific trade or assigned task.