Johns-Manville Thermobestos

Johns-Manville Thermobestos
Manufacturer	Johns-Manville Corporation
Product type	Pipe and block insulation
Years produced	approximately 1930s–1970s
Primary asbestos fiber type	Chrysotile (white asbestos); also amosite in some formulations
Asbestos content by weight	up to 15%
Primary uses	Pipe insulation, boiler insulation, industrial thermal insulation
Trust fund	Manville Personal Injury Settlement Trust (5.1% payment percentage; $350,000 mesothelioma scheduled value; approximately $17,850 ER payout)

Johns-Manville Thermobestos was an asbestos-containing pipe and block insulation product manufactured by the Johns-Manville Corporation from the 1930s through the early 1970s. Thermobestos contained up to 15% asbestos by weight — primarily chrysotile fibers, with amosite in some formulations — and was installed in pipe systems, boilers, and industrial thermal applications across the United States. Workers exposed to Thermobestos have been diagnosed with mesothelioma, lung cancer, and asbestosis in thousands of documented cases, and are eligible to file claims with the Manville Personal Injury Settlement Trust.

What is Thermobestos and what was it used for?

Thermobestos was a brand name for asbestos-containing pipe and block insulation manufactured by the Johns-Manville Corporation. It was used primarily in industrial settings — pipe systems, boilers, and mechanical rooms in power plants, refineries, shipyards, and large commercial buildings — from the 1930s through the early 1970s. The product contained chrysotile (white asbestos) and sometimes amosite fibers. When disturbed during installation, maintenance, or removal, Thermobestos released respirable asbestos fibers that could be inhaled by workers and nearby personnel.

Where was Thermobestos used?

Thermobestos was installed across a wide range of industrial and commercial environments where high-temperature thermal insulation was required. Documented applications include:

• Pipe insulation in industrial and commercial buildings, including steam and process piping
• Boiler rooms and power plants, where high-temperature insulation was applied to boilers, turbines, and associated piping
• Oil refineries and chemical plants, where process equipment operated at elevated temperatures
• Shipyards — both U.S. Navy and commercial — where Thermobestos was used on shipboard piping and mechanical systems
• Heating and ventilation systems in schools, hospitals, and other public buildings

Workers in these environments, including Pipefitters_and_Plumbers, Boilermakers, Insulation_Workers, and Shipyard_Workers, handled Thermobestos directly during installation, repair, and removal. Cutting, sawing, and tearing off insulation released airborne asbestos fibers into the breathing zone.

Did Johns-Manville Thermobestos cause mesothelioma?

Yes. Thermobestos and other Johns-Manville asbestos insulation products have been linked to mesothelioma and other asbestos-related diseases in thousands of documented cases. The Manville Personal Injury Settlement Trust, established in 1988 after Johns-Manville filed for Chapter 11 bankruptcy, was created specifically to compensate workers exposed to Johns-Manville asbestos products. As of 2026, the trust has paid over $5 billion to more than one million claimants. Workers with documented Thermobestos exposure who develop mesothelioma are eligible to file claims with the trust.

What injuries and verdicts are associated with Thermobestos?

The Manville Personal Injury Settlement Trust was established specifically because Johns-Manville faced overwhelming asbestos litigation tied to products including Thermobestos. On August 26, 1982, Manville Corporation and twenty subsidiaries filed for reorganization under Chapter 11 in the Southern District of New York. At the time of filing, Manville was a defendant or co-defendant in approximately 16,500 asbestos-related lawsuits, with more than 400 new cases being filed each month.

Insulation workers at power plants, shipyards, and refineries remain the primary at-risk group for Thermobestos exposure. The World Health Organization's International Agency for Research on Cancer classifies all forms of asbestos — including chrysotile and amosite — as Group 1 carcinogens, with the position that "there is no known safe level of asbestos exposure."

How does the Manville Trust compensate Thermobestos victims?

The Manville Personal Injury Settlement Trust was created as a cornerstone of the 1986 Plan of Reorganization, approved by Bankruptcy Judge Lifland in December 1986. The U.S. Court of Appeals for the Second Circuit confirmed the Plan on October 28, 1988, and the Trust became operational on November 28, 1988.

Trust fund details relevant to Thermobestos claimants:

• Trust: Manville Personal Injury Settlement Trust (established 1988)
• Current payment percentage: 5.1% (as of 2026)
• Mesothelioma scheduled value (Expedited Review): $350,000
• Approximate ER payout: $17,850 (scheduled value × payment percentage)
• Severe asbestosis scheduled value: $95,000 (approximately $4,845 at 5.1%)
• Official site: mantrust.claimsres.com
• Claims paid: over $5 billion to more than one million claimants since 1988

The trust's scheduled value for mesothelioma is $350,000; at the current 5.1% payment percentage, the Expedited Review payout is approximately $17,850. Asbestos bankruptcy trusts including the Manville Trust operate under 11 U.S.C. § 524(g) of the U.S. Bankruptcy Code, a provision enacted by Congress in 1994.

How do you identify Thermobestos exposure today?

Workers at risk for Thermobestos exposure include pipefitters, insulation workers, boilermakers, and shipyard workers who handled asbestos pipe insulation from the 1930s through the 1970s. The average latency period between first asbestos exposure and mesothelioma diagnosis is 30 to 45 years; a CDC review of 21 studies covering 1,105 cases found a median latency of 32 years, with 96% of cases showing at least 20 years of latency and 33% showing at least 40 years. For workers exposed in the 1960s–1970s, the latency window for mesothelioma extends through the 2020s–2040s.

Documentation required to support a Thermobestos trust claim typically includes:

• Employment records identifying job sites and dates of employment
• Payroll stubs from periods of asbestos exposure
• Union records from trades such as pipefitters, boilermakers, or insulators
• Coworker affidavits corroborating presence of Johns-Manville products on the job

Most mesothelioma patients qualify for claims with 10 to 20 different trusts simultaneously, reflecting the fact that asbestos products from multiple manufacturers were often present at the same job sites. See the Asbestos_Products_Database for other asbestos products that may have been present at the same work sites.

Can I file a claim if I was exposed to Johns-Manville Thermobestos?

Yes. Workers exposed to Thermobestos during its period of manufacture and use (approximately 1930s–1970s) who have been diagnosed with mesothelioma, lung cancer, or asbestosis may file a claim with the Manville Personal Injury Settlement Trust. The trust currently pays 5.1% of the scheduled value, which equals approximately $17,850 for a mesothelioma claim under Expedited Review. Most mesothelioma patients also qualify for claims with additional trusts if they were exposed to other manufacturers' products at the same job sites, potentially increasing total recovery significantly.