BOF Patch by Narco: Asbestos Refractory Product Reference

Product Description

BOF Patch was a refractory patching compound manufactured by Narco (North American Refractories Company) during the period spanning approximately 1965 through 1975. The product was specifically engineered for use in Basic Oxygen Furnace (BOF) steelmaking operations, one of the most demanding high-temperature industrial environments in existence. Basic Oxygen Furnaces operate at temperatures exceeding 2,900 degrees Fahrenheit, and their refractory linings — the heat-resistant materials that protect the furnace shell from molten steel and slag — require regular maintenance and patching to remain operational.

BOF Patch was designed as a repair material applied to deteriorating or damaged sections of furnace linings between full relining operations. In steelmaking facilities, furnace downtime is extraordinarily costly, and patching compounds like BOF Patch allowed facilities to extend the service life of existing refractory linings by targeting localized wear, spalling, and erosion damage. The product was applied during maintenance windows and represented a routine consumable material in integrated steel plants and electric arc furnace operations throughout the United States during the decade it was produced.

Narco, headquartered in Pittsburgh, Pennsylvania, was a major supplier of refractory products to the American steel industry for much of the twentieth century. The company supplied a broad range of refractory materials — bricks, castables, gunning mixes, and patching compounds — to steel producers, glass manufacturers, and other high-temperature industrial users. BOF Patch was one of several specialty refractory products in Narco’s catalog formulated for the specific challenges of basic oxygen steelmaking.

Asbestos Content

BOF Patch contained chrysotile asbestos as a component of its refractory formulation. Chrysotile, also referred to as white asbestos, is the most commonly used form of asbestos in industrial products and belongs to the serpentine mineral group. In refractory applications, chrysotile asbestos served multiple functional purposes: it improved the product’s resistance to thermal shock, reinforced the structural integrity of the patched refractory matrix under high-stress cycling conditions, and helped bind the compound during application and initial cure.

Chrysotile asbestos fibers — despite being considered less acutely hazardous than amphibole varieties such as crocidolite or amosite — are recognized carcinogens under multiple regulatory and scientific frameworks. The International Agency for Research on Cancer (IARC) classifies all forms of asbestos, including chrysotile, as Group 1 carcinogens, meaning there is sufficient evidence of carcinogenicity in humans. Regulatory bodies including the U.S. Environmental Protection Agency and OSHA have established that no safe threshold of asbestos exposure has been identified.

In refractory patching compounds, asbestos fibers become a particular hazard when the material is disturbed, mixed, applied by gunning or hand packing, or when cured patches are broken out during subsequent maintenance cycles. Each of these activities has the potential to release respirable asbestos fibers into the breathing zone of nearby workers.

How Workers Were Exposed

Industrial workers engaged in steelmaking and furnace maintenance operations represent the primary population documented as having been exposed to BOF Patch during its production years. Exposure pathways were tied directly to the tasks involved in furnace maintenance within BOF shops and melt shops.

Workers involved in mixing and preparing BOF Patch prior to application would handle the dry or semi-dry compound, generating dust that contained airborne chrysotile fibers. Application workers — whether using hand tools or pneumatic gunning equipment — were exposed to elevated concentrations of airborne dust during the patching process itself. In gunning applications, the mechanical projection of refractory material creates a visible cloud of particulate matter that disperses throughout the immediate work area, affecting not only the operator but any nearby workers.

Furnace reline crews and maintenance workers who broke out old or damaged refractory material — including previously applied patches — were exposed to friable asbestos-containing material during demolition activities. Chipping, breaking, and shoveling out spent refractory generated significant quantities of dust in confined or semi-enclosed furnace environments where ventilation was often limited.

Laborers tasked with cleanup of spent refractory and debris from the furnace interior and surrounding work floor were also subject to secondary dust exposure. Because BOF maintenance was performed on a recurring basis tied to production schedules, many workers experienced repeated, cumulative exposures over the course of their employment at steelmaking facilities.

Other industrial trades present in the vicinity of BOF maintenance operations — including pipefitters, millwrights, electricians, and general laborers — could receive bystander exposures even without directly handling the patching compound. The confined geometry of melt shop environments and the recirculation of airborne dust within large industrial buildings contributed to the potential for widespread secondary exposure.

BOF Patch does not have an associated asbestos bankruptcy trust fund. Narco ultimately established the North American Refractories Company Asbestos Personal Injury Settlement Trust through Chapter 11 bankruptcy proceedings; however, individuals seeking compensation related specifically to BOF Patch exposure should consult with a qualified asbestos attorney to determine current trust eligibility and applicable claim categories, as trust coverage and exposure criteria are subject to specific documentation requirements and may have evolved over time.

For claims falling outside available trust coverage, litigation records document that former industrial workers and their families have pursued asbestos personal injury and wrongful death claims related to refractory product exposures in courts across the United States. Plaintiffs alleged that manufacturers and distributors of asbestos-containing refractory materials, including patching compounds used in steelmaking operations, knew or should have known of the hazards associated with asbestos exposure and failed to adequately warn workers of those risks or take steps to reduce exposure.

Litigation records document claims involving diagnoses including mesothelioma, lung cancer, asbestosis, and other asbestos-related diseases among workers with documented histories of refractory product exposure in industrial settings. Plaintiffs alleged that the failure to provide adequate warnings, safety data, or protective equipment contributed directly to preventable occupational disease.

Individuals who worked in steelmaking, foundry, or heavy industrial environments during the 1960s and 1970s and received a diagnosis of mesothelioma or another asbestos-related condition should seek legal consultation promptly. Statutes of limitations for asbestos claims vary by state and are typically measured from the date of diagnosis or the date the claimant knew or reasonably should have known of the connection between their illness and occupational asbestos exposure. An attorney experienced in asbestos litigation can evaluate exposure history, identify all potentially responsible parties, and advise on available legal remedies including both trust claims and civil litigation options.