H.K. Porter Company (Thermoid Division) — Asbestos Product Manufacturer Reference

Headquarters: Pittsburgh, Pennsylvania Founded: 1866 Ceased Asbestos Use: 1978 Trust Fund: H.K. Porter Company Asbestos Settlement Trust (active)

Company History

H.K. Porter Company was founded in Pittsburgh, Pennsylvania in 1866 and grew over the following century into a diversified industrial manufacturer with operations spanning multiple sectors. Through a series of acquisitions and expansions, H.K. Porter built a portfolio of subsidiaries that supplied materials to some of the most demanding industrial environments in the United States, including shipbuilding, heavy manufacturing, automotive production, and commercial construction.

Among the company’s most significant holdings was the Thermoid Division, which became one of H.K. Porter’s primary vehicles for the manufacture and sale of asbestos-containing textile and friction products. The Thermoid brand was recognized throughout American industry for products engineered to withstand extreme heat and mechanical stress — properties that made asbestos-containing materials particularly attractive to manufacturers and tradespeople working in high-temperature environments.

H.K. Porter’s Thermoid Division supplied asbestos products to industrial customers across the country from the mid-twentieth century through 1978, when the company ceased incorporating asbestos into its product lines. By that time, the health hazards of asbestos exposure had been the subject of growing regulatory and scientific scrutiny, culminating in increasingly strict federal oversight from agencies including the Occupational Safety and Health Administration (OSHA) and the Environmental Protection Agency (EPA).

Facing significant asbestos-related personal injury liability, H.K. Porter Company filed for Chapter 11 bankruptcy protection. As part of the resolution of that bankruptcy, the H.K. Porter Company Asbestos Settlement Trust was established to compensate individuals who developed asbestos-related diseases as a result of exposure to the company’s products.

Asbestos-Containing Products

The Thermoid Division manufactured a defined range of asbestos-containing products intended for industrial, automotive, and marine applications. These products were widely distributed throughout American industry during the peak decades of asbestos use — roughly the late 1940s through the mid-1970s.

Asbestos Woven Cloth and Tape (Thermoid Brand)

Thermoid-brand asbestos woven cloth and tape were produced in multiple grades and thicknesses to serve as thermal insulation, fire barriers, and protective wrapping in industrial and construction settings. These products were used extensively in foundries, steel mills, power generation facilities, and shipyards, where workers wrapped pipes, boilers, and machinery components. Asbestos cloth and tape were also used as curtains and blankets around welding operations to contain sparks and heat. The woven construction of these products made them particularly prone to releasing airborne asbestos fibers during cutting, tearing, or installation — tasks routinely performed by pipefitters, insulators, boilermakers, and shipyard workers.

Asbestos Rope and Yarn

Thermoid Division produced asbestos rope and yarn used to seal expansion joints, pack valve stems, and provide thermal barriers around hot equipment surfaces. These products were standard components in boiler rooms, power plants, and industrial piping systems. Maintenance and installation workers who regularly handled, cut, or replaced asbestos rope and packing materials faced sustained fiber exposure each time those materials were disturbed.

Thermoid Asbestos Brake Linings and Friction Materials

The Thermoid name was perhaps most widely recognized in connection with asbestos-containing brake linings and friction products. Thermoid brake linings were installed in passenger vehicles, commercial trucks, buses, and industrial equipment throughout the postwar decades. Automotive mechanics performing brake jobs — including brake shoe replacement, drum resurfacing, and wheel cylinder service — routinely worked in close proximity to deteriorated Thermoid friction materials. The sanding, grinding, and compressed-air cleaning practices common in automotive shops generated significant concentrations of asbestos dust in poorly ventilated work areas. Thermoid friction materials were also used in marine applications and in industrial machinery, extending the population of potentially exposed workers beyond the automotive trades.

Occupational Exposure

Workers across a broad range of trades and industries encountered H.K. Porter Thermoid asbestos products in the course of their regular employment. Exposure scenarios varied by trade but shared a common thread: the disturbance of asbestos-containing materials in settings where respiratory protection was absent or inadequate.

Industrial and construction trades — including pipefitters, insulators, boilermakers, maintenance mechanics, and millwrights — handled Thermoid asbestos cloth, tape, rope, and yarn in facilities such as steel mills, paper mills, chemical plants, refineries, and power stations. These workers frequently cut, shaped, and installed asbestos textile products in enclosed spaces with limited ventilation.

Shipyard workers at naval and commercial shipbuilding and repair facilities across the country used Thermoid asbestos cloth and tape to wrap pipe systems, bulkheads, and engine room components. Federal shipbuilding programs during and after World War II relied heavily on asbestos-containing materials to meet fire safety specifications on military and commercial vessels.

Automotive mechanics represent another significant exposure group. Brake service work involving Thermoid-brand friction materials was among the most common sources of occupational asbestos exposure in the automotive repair industry. Mechanics who performed brake work repeatedly over the course of their careers accumulated cumulative exposures through the inhalation of asbestos dust released during brake inspection, removal, and installation.

Secondary exposure — sometimes called take-home or household exposure — affected family members of workers who returned home with asbestos fibers embedded in their clothing, hair, or skin. Spouses and children of workers regularly exposed to Thermoid asbestos products may have experienced significant secondary exposure through the laundering of contaminated work clothes or proximity to the worker upon return from the job site.

The latency period for asbestos-related diseases — the interval between initial exposure and disease onset — typically ranges from 20 to 50 years. As a result, individuals exposed to Thermoid asbestos products during the 1950s, 1960s, and 1970s may be receiving diagnoses of mesothelioma, asbestos-related lung cancer, asbestosis, or pleural disease today.

Bankruptcy and Trust Establishment

Following years of mounting asbestos personal injury litigation, H.K. Porter Company filed for Chapter 11 bankruptcy protection. As part of the confirmed reorganization plan, the H.K. Porter Company Asbestos Settlement Trust was created to provide compensation to individuals with qualifying asbestos-related disease claims arising from exposure to H.K. Porter and Thermoid Division products. The trust operates under the oversight of a court-confirmed trust agreement and processes claims on an ongoing basis.

Who May Be Eligible to File

Individuals who may have a viable claim against the H.K. Porter Company Asbestos Settlement Trust generally include:

  • Workers who handled, installed, or maintained Thermoid-brand asbestos cloth, tape, rope, yarn, or friction materials
  • Automotive mechanics who performed brake service involving Thermoid brake linings
  • Shipyard, industrial, or construction workers who used Thermoid asbestos textile products on the job
  • Family members who experienced secondary exposure through a worker’s contaminated clothing or equipment
  • Personal representatives filing on behalf of deceased individuals who had qualifying exposure and developed a qualifying disease

Qualifying diseases typically recognized by asbestos trusts include mesothelioma, lung cancer with documented asbestos exposure, asbestosis, and other asbestos-related pleural conditions. Each trust maintains its own Disease Level schedule and evidentiary requirements.

How to File a Trust Claim

Claims against the H.K. Porter Company Asbestos Settlement Trust are administered through a formal claims process. Claimants — or their legal representatives — are generally required to submit:

  • Medical documentation establishing a diagnosis of a qualifying asbestos-related disease
  • Exposure evidence demonstrating contact with H.K. Porter or Thermoid Division products, which may include work history affidavits, employment records, union records, co-worker testimony, or product identification records
  • Claim forms completed in accordance with the trust’s current Trust Distribution Procedures (TDP)

Because trust claim procedures and payment values may change over time, claimants are strongly encouraged to work with an attorney experienced in asbestos trust fund litigation to ensure that claims are filed correctly and completely.

Summary: What Workers and Families Should Know

If you or a family member worked with or around Thermoid-brand asbestos products — including asbestos woven cloth and tape, asbestos rope and yarn, or Thermoid brake linings and friction materials — between the 1940s and 1978, and have since been diagnosed with mesothelioma, lung cancer, asbestosis, or another asbestos-related condition, you may have a right to compensation through the H.K. Porter Company Asbestos Settlement Trust.

Trust fund claims are separate from lawsuits and can often be filed independently, though many attorneys pursue trust claims and litigation simultaneously to maximize a client’s recovery. There is no requirement to file a lawsuit to access trust compensation.

Because asbestos diseases often appear decades after exposure, it is not uncommon for workers and family members to be unaware that H.K. Porter Thermoid products played a role in their exposure history. Asbestos attorneys and product identification specialists can help piece together a complete occupational history and identify all applicable trust funds and defendants.

Time limits apply to asbestos claims. Statutes of limitations for asbestos personal injury claims vary by state, and trust fund claim deadlines are established under each trust’s distribution procedures. Consulting with a qualified asbestos attorney promptly after diagnosis is strongly recommended.