Fiberite Corporation — Asbestos Product Reference

Manufacturer: Fiberite Corporation Headquarters: Winona, Minnesota Founded: 1945 Documented Asbestos Use: Through approximately 1973 Product Categories: Phenolic-resin molding compounds, thermoset electrical compounds

Company History

Fiberite Corporation was founded in 1945 in Winona, Minnesota, and built its business around the development and manufacture of specialty polymer compounds — primarily phenolic resins and thermoset materials intended for industrial and electrical applications. The company became a recognized supplier to the electrical equipment manufacturing sector during the postwar industrial expansion of the late 1940s and 1950s, a period when phenolic molding compounds were widely used as insulators, housings, and structural components in switchgear, motors, transformers, and related electrical assemblies.

Throughout the 1950s and into the 1970s, asbestos fiber was a common additive in phenolic and thermoset compounds because it improved heat resistance, dimensional stability, and arc suppression — properties especially valued in electrical applications where components were exposed to sustained thermal stress. Fiberite’s product line during this era included formulations that, according to asbestos litigation records, contained asbestos as a functional filler material.

The company operated during a period when regulatory attention to occupational asbestos exposure was intensifying. The Occupational Safety and Health Administration issued its first asbestos standards in 1971, and the Environmental Protection Agency began classifying asbestos as a hazardous air pollutant during the same period. Court filings document that Fiberite ceased incorporating asbestos into its compound formulations by approximately 1973, consistent with the broader industry trend toward reformulation during the early 1970s.

Fiberite later evolved through acquisition and restructuring into a composites company focused on aerospace and advanced materials. However, the historical product line manufactured through the early 1970s remains relevant to occupational exposure claims arising from industrial and electrical jobsites of that era.

Asbestos-Containing Products

According to asbestos litigation records, several Fiberite compound formulations contained asbestos as an intentional filler or reinforcement material. The following products have been identified in litigation and historical documentation:

Fiberite FM 8130 Asbestos-Filled Phenolic Compound

The FM 8130 was a phenolic molding compound in which asbestos served as the primary filler material. Phenolic compounds of this type were typically compression-molded into electrical components such as circuit breaker housings, arc chutes, terminal boards, and insulating brackets. Plaintiffs alleged in various proceedings that workers involved in molding, grinding, trimming, and finishing operations with FM 8130 and similar asbestos-filled phenolics were exposed to airborne asbestos fibers released during fabrication.

Fiberite FM 10365 Phenolic Molding Compound

The FM 10365 is identified in asbestos litigation records as a phenolic molding compound supplied by Fiberite to industrial customers, including electrical equipment manufacturers. Court filings document its inclusion among the Fiberite formulations at issue in exposure claims brought by workers in electrical manufacturing facilities.

Fiberite FM 3510

The FM 3510 formulation is among the most specifically documented products in the Fiberite asbestos litigation record. Asbestos content in the FM 3510 compound is confirmed through a 1973 correspondence between Fiberite Corporation and Westinghouse Electric, in which the asbestos-filled nature of the compound was explicitly acknowledged. This contemporaneous business correspondence has been referenced in court filings as direct evidence that Fiberite supplied asbestos-containing compounds to Westinghouse for use in electrical equipment manufacturing. Plaintiffs alleged that downstream workers — including those who machined, cut, or otherwise processed Westinghouse equipment incorporating FM 3510 — may have encountered asbestos-containing material without adequate warning.

Fiberite 1333A Thermoset Compound

The 1333A was a thermoset compound in the Fiberite product line identified in asbestos litigation records as an asbestos-containing formulation. Thermoset compounds, once cured, cannot be remelted, making them common in high-temperature electrical applications. According to plaintiffs in related proceedings, asbestos-containing thermoset compounds like the 1333A posed exposure risks during both the original molding process and subsequent operations such as drilling, sanding, and mechanical finishing of finished parts.

Occupational Exposure

The workers most likely to have encountered Fiberite asbestos-containing compounds fall into two broad categories: those employed at facilities that used Fiberite compounds to manufacture finished components, and those who subsequently worked with or around electrical equipment containing parts made from those compounds.

Compounding and Molding Workers: Facilities that purchased Fiberite phenolic and thermoset compounds used them in compression and transfer molding operations. According to asbestos litigation records, workers in these settings — including mold operators, press operators, and material handlers — were potentially exposed to asbestos-containing dust during loading, mixing, and molding of compound pellets or powder. Phenolic molding compounds often arrived in granular or powder form, and handling of bulk material prior to molding could generate airborne dust.

Finishing and Fabrication Workers: After molded parts were removed from presses, finishing operations including deflashing, grinding, drilling, and sanding were commonly required. Court filings document plaintiffs’ allegations that these secondary operations on asbestos-filled phenolic parts released respirable asbestos fibers, often in poorly ventilated workspaces where controls were limited or absent.

Electrical Equipment Manufacturing Workers: Because Fiberite supplied compounds to electrical equipment manufacturers — with the Westinghouse relationship specifically documented — workers at downstream manufacturing facilities may have encountered finished components containing Fiberite asbestos-containing material. Electricians, assemblers, and maintenance workers who cut, drilled, or modified electrical components made from asbestos-filled phenolics during installation or repair work are among those who have appeared as plaintiffs in related litigation.

Tradespeople and Maintenance Workers: Electricians, industrial maintenance workers, and equipment repair personnel who worked with older switchgear, motor control centers, and related electrical assemblies during the 1950s through the 1980s may have disturbed asbestos-containing phenolic components as part of routine repair and overhaul work. In many cases, such workers would not have known the specific compound used in a given component’s manufacture.

The diseases most commonly associated with occupational asbestos exposure — including mesothelioma, asbestos-related lung cancer, asbestosis, and pleural disease — typically have latency periods of 20 to 50 years from first exposure, meaning workers exposed to Fiberite compounds during the 1950s through the early 1970s may be receiving diagnoses today.

Trust Fund / Legal Status

Fiberite Corporation does not have an established asbestos bankruptcy trust fund. Unlike manufacturers that resolved mass asbestos liability through Chapter 11 reorganization under Section 524(g) of the U.S. Bankruptcy Code, Fiberite has not established a dedicated trust to compensate asbestos claimants. Accordingly, claims related to Fiberite asbestos-containing compounds cannot be submitted to a trust for administrative processing.

According to asbestos litigation records, claims involving Fiberite have appeared in civil litigation proceedings. Plaintiffs alleged exposure through the company’s phenolic and thermoset compound products and pursued claims through the civil court system rather than through a trust mechanism.

For workers and families researching Fiberite exposure as part of an asbestos illness claim, several considerations are relevant:

Multi-Defendant Claims: Because Fiberite supplied compounds to electrical equipment manufacturers — and because the FM 3510 connection to Westinghouse is documented through contemporaneous correspondence — exposure claims in this context often involve multiple defendants, including both the compound manufacturer and the equipment manufacturers who incorporated those compounds into finished products. An attorney experienced in asbestos litigation can help identify all potentially responsible parties.

Documentation: The 1973 Fiberite-to-Westinghouse letter confirming asbestos content in the FM 3510 formulation represents the type of contemporaneous business record that can be significant in civil claims. Workers who can connect their employment history to facilities that used Fiberite compounds, or to electrical equipment containing Fiberite-formulated components, should document their work history as specifically as possible.

Statute of Limitations: Asbestos illness claims are subject to statutes of limitations that vary by jurisdiction and typically begin running at the time of diagnosis or discovery of the asbestos-related condition, not at the time of original exposure. Anyone recently diagnosed with mesothelioma, lung cancer, or another asbestos-related disease and with a work history involving phenolic compound manufacturing, electrical equipment production, or related trades should consult an attorney promptly.

Summary for Workers and Families

Fiberite Corporation manufactured asbestos-containing phenolic and thermoset molding compounds in Winona, Minnesota from the mid-1940s until approximately 1973. Specific products — including the FM 8130, FM 10365, FM 3510, and 1333A formulations — are identified in asbestos litigation records as having contained asbestos. The asbestos content of the FM 3510 compound is specifically confirmed through documented correspondence with Westinghouse Electric. Workers in compound molding, electrical equipment manufacturing, and electrical trades who handled or worked near components made from these materials may have sustained asbestos exposure. Because Fiberite has no asbestos bankruptcy trust fund, compensation claims proceed through civil litigation rather than trust submission. Workers or family members with a mesothelioma or asbestos-related diagnosis and a relevant work history should consult a qualified asbestos attorney to evaluate available legal options.