Plisulate Insulating Cement No. 101

Manufacturer: Plibrico Company Product Categories: Pipe Insulation, Refractory Materials Legal Status: Tier 2 — Litigated Product

Product Description

Plisulate Insulating Cement No. 101 was a high-temperature insulating cement manufactured by the Plibrico Company, a Chicago-based firm that operated as a major producer of monolithic refractory and insulating materials throughout much of the twentieth century. Plibrico built its commercial reputation on a broad line of castable, rammable, and plastic refractory products sold under recognizable trade names, and Plisulate represented the company’s effort to address the specific thermal insulation demands of industrial piping systems and high-heat equipment.

Insulating cements of this type were engineered for application over pipes, boilers, vessels, tanks, and related industrial infrastructure operating at elevated temperatures. The product was formulated as a trowelable or hand-packed cement that could be shaped and built up in layers around pipe fittings, valves, flanges, and irregularly contoured surfaces where pre-formed block insulation could not be easily fitted. Once dried and cured, Plisulate No. 101 provided a rigid, heat-resistant insulating jacket intended to reduce thermal loss and protect workers and equipment from surface temperatures.

The product was marketed to industrial facilities including oil refineries, chemical processing plants, steel mills, shipyards, power generating stations, and manufacturing operations — environments where high-temperature piping systems required reliable and durable insulation. Plibrico distributed its products through a network of licensed applicators, meaning Plisulate No. 101 was installed not only by facility maintenance crews but also by specialized insulation contractors working across heavy industry throughout the mid-twentieth century.

Asbestos Content

Insulating cements produced during the mid-twentieth century routinely incorporated asbestos fibers as a primary functional ingredient. Asbestos — most commonly chrysotile, but also amphibole varieties including amosite — was valued in these formulations for its exceptional heat resistance, its ability to bind the cement matrix, its resistance to thermal cracking, and its dimensional stability under repeated heating and cooling cycles. For a product like Plisulate No. 101, intended for continuous service in high-temperature industrial environments, asbestos offered performance characteristics that were difficult to replicate with alternative materials available at the time.

Litigation records document that Plisulate Insulating Cement No. 101 contained asbestos as a component of its formulation. Plaintiffs alleged that the product was manufactured and sold with asbestos content at levels sufficient to release respirable fibers during routine handling, mixing, application, and removal. Because insulating cements were typically supplied in dry powder or semi-dry form requiring on-site mixing with water, the preparatory phase of use involved direct handling of dry asbestos-containing material — a process known to generate significant airborne fiber concentrations.

The precise asbestos content by weight in Plisulate No. 101 has been addressed in litigation and in product identification analyses, though formulations may have varied across production periods. Plaintiffs in multiple cases identified the product through industrial hygiene records, Plibrico product literature, and witness testimony from coworkers and supervisors who handled and applied the material over extended periods of employment.

How Workers Were Exposed

Workers encountered Plisulate Insulating Cement No. 101 across a range of industrial trades and settings. Exposure occurred at multiple stages of the product’s lifecycle, from initial preparation through application, maintenance, and eventual removal.

Mixing and Preparation: The cement was commonly supplied as a dry powder that required mixing with water before application. Workers who opened bags, poured powder into mixing vessels, and stirred the mixture were exposed to dust clouds containing asbestos fibers. This preparatory work often took place in confined or poorly ventilated areas of industrial plants, allowing fibers to accumulate in breathing zones.

Application: Insulators, pipe coverers, and general industrial workers applied Plisulate No. 101 by hand or with trowels, packing and shaping the wet cement around pipes, fittings, and equipment. Even wet application could disturb previously dried material and generate fiber release. Workers in adjacent trades — pipefitters, boilermakers, millwrights, electricians, and laborers working in the same areas — were exposed to fibers released by others without any direct involvement in the insulation work itself.

Cutting, Trimming, and Finishing: After the cement dried and cured, it sometimes required cutting, grinding, or surface finishing to achieve a proper fit or smooth finish. These dry operations generated substantial dust. Litigation records document that workers performing or observing these tasks had no routine access to respiratory protection during the periods when such work was most common.

Maintenance and Repair: Industrial piping systems required periodic maintenance, and damaged or deteriorated insulation cement was broken away, chipped off, or scraped from pipe surfaces before new material was applied. Plaintiffs alleged that this disturbance of aged, friable insulating cement was among the highest-exposure scenarios associated with the product, as dried asbestos-containing material crumbled and released fibers readily when disturbed.

Bystander Exposure: General industrial workers who were not themselves insulators but who worked in proximity to insulation activities — in the same boiler rooms, pipe chases, or plant floors — were documented as having received secondhand exposure to airborne fibers from Plisulate and similar products.

Plisulate Insulating Cement No. 101 is a Tier 2 product associated with civil litigation rather than an active asbestos bankruptcy trust fund. Plibrico Company has been named as a defendant in asbestos personal injury litigation, and litigation records document claims brought by industrial workers and insulators who alleged occupational exposure to Plisulate and related Plibrico products.

Plaintiffs alleged that Plibrico knew or should have known of the hazards associated with asbestos-containing insulating cements and failed to provide adequate warnings to workers who used, applied, or worked near its products. Claims have included allegations of negligence, strict products liability, and failure to warn, brought by individuals diagnosed with asbestos-related diseases including mesothelioma, asbestosis, and lung cancer following occupational exposure.

For individuals who believe they were exposed to Plisulate Insulating Cement No. 101, the following steps are relevant:

  • Document the exposure history as specifically as possible, including job sites, employers, dates of employment, and the names of other products present at the same locations.
  • Obtain a confirmed diagnosis from a physician experienced in asbestos-related disease, as the specific diagnosis — mesothelioma, asbestosis, lung cancer, or pleural disease — affects the applicable legal pathways.
  • Consult an asbestos litigation attorney who can evaluate the full exposure history, identify all potentially liable parties across a career that may have spanned many employers and product manufacturers, and assess whether claims remain viable under applicable statutes of limitations.
  • Identify all product exposures, as workers who encountered Plisulate No. 101 frequently also worked with other asbestos-containing insulation products, and multiple defendants or trust funds may be relevant to a comprehensive claim.

Workers in oil refining, chemical manufacturing, steel production, shipbuilding, and power generation who handled or worked near insulating cements during the mid-twentieth century should consult qualified legal counsel to evaluate their options.

This article is provided for informational and reference purposes. It does not constitute legal advice. Individuals seeking legal guidance regarding asbestos exposure should consult a licensed attorney.