Pittsburgh Corning Corp.: Unibestos Asbestos History & Liability

Company History & the Unibestos Product Line

Pittsburgh Corning Corporation was incorporated in 1937 as a joint venture between two industrial giants: Pittsburgh Plate Glass Company (today’s PPG Industries) and Corning Glass Works (today’s Corning Inc.). The venture was formed to develop and commercialize FOAMGLAS, a cellular glass insulation product that contained no asbestos and that remains in production today under separate ownership. For its first two decades of operation, Pittsburgh Corning was primarily a glass-products company with no involvement in asbestos materials.

The company’s fateful pivot into asbestos came in the early 1960s. Seeking to expand its insulation portfolio and capture a share of the booming post-war industrial and shipbuilding market, Pittsburgh Corning developed Unibestos — a pipe and block insulation product built around amosite, or “brown” asbestos, mined largely in South Africa. Unlike chrysotile (white asbestos), which was the most prevalent fiber used in building materials, amosite fibers are notably more rigid and biopersistent, lodging deeply in lung tissue and the pleural lining where they are extremely difficult for the body to clear. Unibestos contained between 70 and 80 percent amosite asbestos by weight, making it one of the most asbestos-dense commercial insulation products ever brought to market in the United States.

Production ramped up at a new manufacturing facility in Tyler, Texas, which opened in 1963, and at a second plant in Sedalia, Missouri. Pittsburgh Corning aggressively marketed Unibestos to the U.S. Navy for use in shipbuilding, where the product insulated pipe systems, boilers, and engine rooms aboard vessels constructed and repaired at shipyards nationwide. Industrial customers in refineries, chemical plants, and power-generation facilities also became major buyers. Between roughly 1962 and 1972, Unibestos was installed across an enormous footprint of American industry and military infrastructure, placing hundreds of thousands of workers in direct contact with one of the most hazardous forms of commercial asbestos ever sold.

Internal company correspondence and medical research from the era, later obtained through litigation discovery, demonstrated that Pittsburgh Corning executives were aware — as early as the mid-1960s — that the airborne fiber concentrations in their own manufacturing plants far exceeded any threshold then considered safe, and that workers were being harmed. Despite this awareness, the company did not promptly implement adequate engineering controls, provide effective respirators, or warn workers and downstream product users about the cancer risks associated with amosite exposure. This deliberate failure to act, documented in internal memoranda introduced at trial in dozens of cases, became central to the wave of asbestos litigation that ultimately drove Pittsburgh Corning into bankruptcy.

By the late 1970s and through the 1980s, the tide of lawsuits from shipyard workers, industrial insulation tradespeople, and Unibestos plant employees grew into an overwhelming legal and financial burden. Pittsburgh Corning continued to defend and settle claims for two decades but could not outpace the volume of new diagnoses arising from exposures that had taken place a generation earlier. Mesothelioma, the signature disease associated with amosite exposure, has a latency period of 20 to 50 years, meaning that workers who inhaled Unibestos dust in the 1960s might not receive a diagnosis until well into the 1990s or 2000s. On April 16, 2000, Pittsburgh Corning Corporation filed for Chapter 11 bankruptcy protection in the United States Bankruptcy Court for the Western District of Pennsylvania. Its reorganization plan, confirmed after years of complex negotiation with creditor committees, asbestos claimants’ representatives, the company’s parent corporations, and a future claims representative appointed to protect those not yet diagnosed, created the Pittsburgh Corning Asbestos Personal Injury Trust as the permanent compensation vehicle for victims.

Pittsburgh Corning Asbestos Products & Exposure Pathways

The primary source of asbestos-related injury attributable to Pittsburgh Corning is the Unibestos product line. Understanding how and where people encountered these products is critical both for establishing a compensable claim against the Pittsburgh Corning Trust and for identifying other potentially liable parties from the same exposure history.

The amosite fiber used in Unibestos is considered among the most carcinogenic asbestos fiber types. Epidemiological studies of insulation workers exposed to amosite-containing products have consistently shown elevated rates of mesothelioma far exceeding those seen with chrysotile exposure alone. Because Unibestos was applied in confined spaces — ship engine rooms, industrial pipe chases, boiler rooms — the airborne fiber concentrations encountered by workers during installation and removal were often extraordinarily high. Workers who handled Unibestos daily were routinely immersed in visible clouds of asbestos dust with no respiratory protection beyond, at most, a paper dust mask wholly inadequate for stopping submicron amosite fibers.

It is also important to note that nearby tradespeople — electricians, sheet metal workers, painters, and laborers working in the same spaces as insulators — suffered significant bystander exposures to Unibestos dust even if they never personally handled the product. This “bystander exposure” category has been recognized in numerous court decisions and is an accepted basis for asbestos trust claims.

Pittsburgh Corning Manufacturing Facilities

Pittsburgh Corning operated manufacturing and administrative sites across several states. Each facility played a distinct role in the company’s asbestos operations, and workers at each location faced varying but often severe asbestos exposure risks. Identifying which facility a worker was employed at can affect both the evidentiary record required for a trust claim and the other defendants that an attorney may pursue concurrently.

Workers who can document employment at any of the above facilities, or who can demonstrate product identification showing Unibestos was present at their jobsite, may have a valid claim against the Pittsburgh Corning Trust. An attorney experienced in asbestos trust litigation can help locate surviving plant records, union employment histories, co-worker affidavits, and product specification documents that establish the necessary exposure history.

The Tyler, Texas Disaster: A Turning Point in Asbestos Law

No facility in Pittsburgh Corning’s history carries the weight of the Tyler, Texas Unibestos plant. When the company opened that factory in 1963, it was a calculated strategic expansion — Texas labor was affordable, transportation links to Gulf Coast refineries and petrochemical plants were favorable, and the facility was well-positioned to supply the growing regional demand for industrial insulation. What unfolded over the following decade became one of the most consequential occupational health disasters in American industrial history.

By the early 1970s, workers at the Tyler plant were falling gravely ill in numbers that could not be explained by chance or by ordinary actuarial variance. Men who had worked the production floor for only a few years were developing the telltale shortness of breath and pleural changes associated with asbestos disease. The National Institute for Occupational Safety and Health (NIOSH) conducted detailed epidemiological investigations of the Tyler workforce beginning in the early 1970s. Their published findings were alarming: workers who had been employed at the plant showed rates of radiographically confirmed asbestosis and pleural disease that were staggering even by the bleak standards of the mid-century asbestos industry. Mortality studies conducted in subsequent years confirmed excess deaths from mesothelioma and lung cancer at rates far exceeding background population levels. Some research indicated that a majority of long-tenure Tyler plant workers showed objectively confirmed evidence of asbestos-related pulmonary injury.

The NIOSH investigations at Tyler were not merely important to the workers themselves — they became foundational documents in the broader regulatory effort to establish enforceable workplace asbestos standards across American industry. The Occupational Safety and Health Administration cited the Tyler data, among other epidemiological evidence, when developing and progressively tightening its permissible exposure limits for asbestos during the 1970s and early 1980s. The Tyler plant thus holds a distinctive place in regulatory history: it was a primary source of the very scientific evidence that compelled the government to act to protect workers nationwide from asbestos exposure.

In the litigation arena, the Tyler facility proved equally transformative. Internal Pittsburgh Corning documents obtained through discovery in civil asbestos cases — including plant air sampling reports, communications among senior executives, correspondence with the company’s industrial hygienists and medical consultants, and memoranda discussing the legal and reputational implications of publicizing the hazard — showed that management had received credible warnings about dangerous dust levels at Tyler and about the established connection between amosite asbestos and cancer well before any warnings were provided to plant workers, product users, or the public. In case after case across the country, attorneys for injured workers and their families used these documents to establish that Pittsburgh Corning possessed actual knowledge of the risk and consciously chose not to act on it. That evidentiary record supported not only substantial compensatory damages but, in many instances, punitive damages designed to punish and deter deliberate corporate indifference to worker safety.

The environmental legacy of the Tyler plant did not end with the cessation of Unibestos production. The surrounding soil, structures, and groundwater were found to be contaminated with asbestos fibers, and the site was placed on the U.S. Environmental Protection Agency’s National Priorities List under the federal Superfund program. Remediation of asbestos-contaminated Superfund sites is a lengthy, expensive, and technically complex undertaking. The designation of the Tyler plant as a Superfund site is a lasting reminder that the consequences of Pittsburgh Corning’s decision to manufacture amosite insulation with minimal worker protections extend far beyond the individual tragedies of the men and women who worked the production floor.

For the thousands of Tyler workers and their families, the plant’s story is deeply and painfully personal. Many men who worked the production floor in the 1960s died of mesothelioma decades later, often after years of unexplained symptoms, misdiagnoses, and the frustrating search for a legal remedy. The characteristic latency period for mesothelioma — typically 20 to 50 years from first significant asbestos exposure to clinical diagnosis — means that even today, individuals who were exposed at Tyler during the plant’s peak operating years, or who were exposed to Unibestos insulation installed during that era, may only now be receiving a diagnosis.

Pittsburgh Corning Asbestos Personal Injury Trust: Claims & Compensation

When Pittsburgh Corning filed for Chapter 11 bankruptcy in April 2000, the company joined a growing roster of asbestos manufacturers that could no longer sustain the financial weight of ongoing mass tort litigation. After years of complex negotiations among the debtor, its primary insurers, the parent companies PPG Industries and Corning Inc., official committees representing existing asbestos claimants, and a court-appointed future claims representative charged with protecting the interests of individuals not yet diagnosed at the time of the filing, a plan of reorganization was confirmed by the bankruptcy court. That plan created the Pittsburgh Corning Asbestos Personal Injury Settlement Trust as the sole and permanent vehicle for compensating individuals harmed by the company’s asbestos products.

Payment Percentage

The Pittsburgh Corning Trust currently pays qualifying claims at a payment percentage of approximately 19 percent of the scheduled value assigned to each disease category under the Trust Distribution Procedures (TDP) — the governing document that defines how claims are categorized, evaluated, and compensated. Scheduled values are higher for more severe diseases: mesothelioma carries the highest scheduled value, followed by lung cancer with asbestosis, lung cancer without asbestosis, other asbestos-related cancers, severe asbestosis, and less severe pleural and pulmonary disease. Applying the 19 percent payment percentage to the applicable scheduled value produces the actual cash amount disbursed by the trust for a given approved claim.

It is critically important to understand that the Pittsburgh Corning Trust is typically only one of multiple trusts and solvent defendants that an experienced asbestos attorney will pursue simultaneously on a victim’s behalf. Because Unibestos was applied alongside insulation products from many other manufacturers — Owens Corning, Johns Manville, Armstrong World Industries, Celotex, Keene Corporation, and many others — a single mesothelioma victim may have valid claims against a dozen or more trust funds and possibly against solvent companies as well. The combined recovery from all sources can be substantially larger than any single trust payment alone, and in many cases total settlements far exceed what any one trust would pay.

Qualifying Diseases

The Pittsburgh Corning Trust accepts claims for the following disease categories, listed in general order of scheduled compensation value:

• Mesothelioma — malignant pleural, peritoneal, or pericardial mesothelioma confirmed by pathology
• Lung Cancer with Asbestosis — primary lung cancer in a claimant with radiographically or pathologically confirmed asbestosis
• Lung Cancer without Asbestosis — primary lung cancer meeting minimum exposure duration and occupational history criteria established in the TDP
• Other Asbestos-Related Cancers — laryngeal, esophageal, pharyngeal, and certain gastrointestinal cancers with documented qualifying asbestos exposure history
• Severe Asbestosis — radiographically confirmed asbestosis with significant pulmonary function impairment meeting ILO profusion and spirometry criteria
• Asbestosis / Pleural Disease — confirmed pleural plaques, pleural thickening, or early-stage asbestosis meeting minimum ILO profusion standards

Expedited Review vs. Individual Review

The Pittsburgh Corning Trust offers two claim processing pathways. Expedited Review allows claimants who meet specified medical and exposure documentation criteria to receive the full scheduled value payment efficiently, without the extended record-development process required for Individual Review. Most mesothelioma claims with clear exposure history and adequate medical documentation qualify for Expedited Review, making it the most common pathway for seriously ill claimants and their families. Individual Review is available for claims that do not satisfy expedited criteria or for situations where the attorney believes the totality of the exposure record and disease severity justifies a payment above the standard scheduled value. Individual Review involves a more detailed factual presentation, may require additional documentation, and typically takes longer to resolve — but it provides a mechanism for addressing claims with unusual or complex circumstances.

How to File a Claim

Claims against the Pittsburgh Corning Trust must be filed through a licensed attorney familiar with the trust’s distribution procedures and documentation requirements. The claims process requires assembling a comprehensive work history demonstrating direct or bystander exposure to Pittsburgh Corning Unibestos products at identified jobsites and during identified time periods, together with medical documentation confirming the qualifying diagnosis. Experienced asbestos attorneys maintain extensive databases of historical jobsite records, product identification evidence, union membership records, and co-worker testimonies that can dramatically streamline this process. In many cases, attorneys can identify product presence at a given worksite from historical invoices, plant maintenance records, or prior co-worker depositions even when the individual claimant has no personal records.

Most asbestos attorneys handle Unibestos and other asbestos trust claims on a contingency fee basis, meaning the attorney collects a percentage of any recovery obtained and the claimant or their family pays nothing upfront. This fee structure makes legal representation accessible to seriously ill workers and surviving family members regardless of their financial situation.

Given that trust payment percentages and available assets can shift over time as new claims are filed against the trust, investment returns fluctuate, and the future claims representative adjusts projections, it is strongly advisable to consult with an attorney as early as possible following a diagnosis of mesothelioma or another asbestos-related disease. Prompt action can preserve the maximum value of a claim and ensure that all applicable filing deadlines are met.

Frequently Asked Questions