Harbison-Walker Plastic Refractories and Castables

Product Description

Harbison-Walker Refractories Company was one of the most prominent manufacturers of refractory products in the United States, with a history in the industry spanning well over a century. Among the broad range of refractory materials the company produced, plastic refractories and castables occupied a critical role in high-temperature industrial applications across many sectors of American manufacturing.

Plastic refractories are dense, moldable refractory materials that can be rammed, pressed, or hand-formed into place around furnaces, kilns, boilers, and other high-heat equipment. Unlike preformed refractory brick, plastic refractories are supplied in a workable, putty-like state that allows installers to fill irregular shapes, patch damaged linings, and construct monolithic refractory structures without mortar joints. Castables, by contrast, are dry refractory mixes that are combined with water on-site and poured or pumped into forms, much like a refractory-grade concrete. Both product types cure in place to form a hard, heat-resistant lining capable of withstanding extreme operating temperatures.

Harbison-Walker supplied these materials to steel mills, aluminum smelters, glass furnaces, petrochemical plants, cement kilns, coke ovens, power generation facilities, and a wide range of other heavy industrial operations. The company’s plastic refractories and castables were used extensively during the mid-twentieth century, a period when asbestos was commonly incorporated into refractory formulations to improve thermal performance and mechanical handling characteristics.

Asbestos Content

During the decades when asbestos use in industrial products was widespread and largely unregulated, Harbison-Walker incorporated asbestos fibers into certain formulations of its plastic refractories and castables. Asbestos was valued in these applications for its exceptional thermal stability, its resistance to thermal shock, and its ability to reinforce the matrix of the refractory material, helping it retain structural integrity under repeated heating and cooling cycles.

Chrysotile asbestos was the most commonly used fiber type in refractory binders and castable mixes during this era, though amphibole varieties including amosite were also documented in refractory product formulations from multiple manufacturers. In plastic refractories, asbestos fibers were blended directly into the workable mass, distributing the mineral throughout the product. In castable formulations, asbestos could be present as a reinforcing component within the dry mix, becoming fully integrated once water was added and the material set.

The presence of asbestos in these products was consistent with industry-wide practice during the peak production years. Harbison-Walker’s product lines were extensively documented in commercial trade literature of the period, and the company’s refractory materials are identified within the claims criteria and exposure records maintained by the Harbison-Walker International Asbestos PI Trust.

How Workers Were Exposed

Exposure to asbestos from Harbison-Walker plastic refractories and castables occurred primarily among industrial workers who handled, installed, maintained, repaired, or demolished refractory linings in which these products were used. The nature of working with plastic refractories and castables created multiple pathways for fiber release.

Installation work involved cutting, troweling, ramming, and shaping plastic refractory material by hand or with tools, all of which disturbed the asbestos-containing matrix and could release fibers into the immediate work environment. Workers mixing castables from dry powder were particularly at risk, as the blending process could generate substantial airborne dust before water was added to the formulation.

Maintenance and repair activities at steel mills, foundries, and industrial plants routinely required refractory workers and industrial craftsmen to chip out and replace worn or damaged refractory linings. Breaking apart cured castable or hardened plastic refractory material released previously bound asbestos fibers in concentrated form, creating high-exposure conditions in confined spaces such as furnace interiors.

Demolition of furnaces and industrial equipment brought additional workers into contact with degraded refractory materials. Ironworkers, boilermakers, pipefitters, millwrights, and general industrial laborers who performed teardown and relining work at industrial facilities could be exposed to asbestos dust from refractory linings without necessarily knowing the specific product or manufacturer involved.

Bystander and nearby-trade exposure was also a significant factor in heavy industrial settings. Workers in adjacent areas of a plant or facility who were not directly involved in refractory installation or removal could nonetheless breathe asbestos-laden dust that traveled through poorly ventilated furnace rooms, boiler houses, and production floors.

Industrial hygiene practices at many facilities during the peak decades of asbestos use were insufficient to control fiber release. Respiratory protection was inconsistently provided, and workers frequently labored in conditions where asbestos exposure was continuous and unmonitored. The latency period for asbestos-related diseases — which can extend twenty to fifty years from the time of first exposure — means that individuals who worked with or around Harbison-Walker plastic refractories and castables decades ago may be receiving diagnoses of mesothelioma, asbestosis, lung cancer, or other asbestos-attributable conditions today.

Harbison-Walker Refractories Company filed for bankruptcy protection as a result of the mounting volume of asbestos personal injury litigation filed against it. As part of the bankruptcy reorganization process, the Harbison-Walker International Asbestos PI Trust was established to compensate individuals who suffered asbestos-related injuries attributable to exposure to the company’s products, including its plastic refractories and castables.

The Trust operates under a Trust Distribution Procedure (TDP) that governs eligibility criteria, claim categories, and payment levels. Claims are evaluated based on the claimant’s diagnosis, documented exposure to Harbison-Walker products, and medical evidence establishing an asbestos-related disease. Recognized disease categories under the Trust’s TDP include:

  • Mesothelioma — malignant mesothelioma of the pleura, peritoneum, or pericardium
  • Lung cancer — with documented asbestos exposure and qualifying occupational history
  • Asbestosis — confirmed by pulmonary function testing and imaging consistent with AHERA and ATS diagnostic criteria
  • Other asbestos-related conditions — including pleural disease meeting defined severity thresholds

Individuals who worked in industrial settings where Harbison-Walker plastic refractories or castables were installed, maintained, or removed may be eligible to file a claim with the Trust. Exposure to these specific products does not need to have been the sole source of asbestos contact; the Trust’s criteria are designed to accommodate the complex, multi-product exposure histories typical of industrial workers.

Surviving family members, including spouses and dependents, may be eligible to file wrongful death or derivative claims on behalf of a deceased worker who suffered an asbestos-related illness.

Because Trust filing involves procedural deadlines, documentation requirements, and product identification standards, individuals pursuing claims are strongly encouraged to consult with an attorney experienced in asbestos trust fund claims. Legal counsel can assist with gathering occupational records, medical documentation, and co-worker affidavits that support eligibility under the Harbison-Walker International Asbestos PI Trust’s established criteria.