Kast-O-Lite Gunning Refractory (A.P. Green Industries)

Kast-O-Lite was a castable and gunnable refractory lining material manufactured by A.P. Green Industries and used extensively in high-temperature industrial applications from the mid-1950s through the early 1970s. Workers who mixed, applied, or disturbed Kast-O-Lite during this period may have been exposed to chrysotile asbestos fibers released from the product’s calcium silicate and refractory matrix. The A.P. Green Industries Asbestos Settlement Trust was established to compensate eligible claimants, and Kast-O-Lite is among the products documented in trust records as a basis for filing.

Product Description

Kast-O-Lite Gunning Refractory was a specialty industrial product designed to line, repair, and insulate the interior walls of high-temperature vessels, including blast furnaces, electric arc furnaces, soaking pits, boilers, and aluminum smelting pots. A.P. Green Industries, headquartered in Mexico, Missouri, was one of the leading manufacturers of refractory materials in North America during the twentieth century. The company produced a broad range of castable, gunnable, and plastic refractories under its Kast-O-Lite brand line, with different formulations targeting specific temperature ranges and industrial environments.

The “gunning” designation refers to the application method: the mixed refractory material was sprayed or pneumatically projected onto furnace walls and other high-heat surfaces using specialized equipment. This method allowed workers to apply thick, uniform linings to complex curved surfaces without extensive manual forming. Gunning was also a preferred technique for patching and repairing worn or cracked furnace linings during scheduled maintenance outages, making Kast-O-Lite a routine presence in steelmaking and metals-processing facilities throughout the United States.

Production of the asbestos-containing formulation of Kast-O-Lite occurred from approximately 1956 through 1972, coinciding with the period of heaviest industrial expansion in steel, aluminum, and heavy manufacturing sectors.

Asbestos Content

Kast-O-Lite Gunning Refractory contained chrysotile asbestos incorporated into a calcium silicate and refractory matrix. Chrysotile, sometimes called white asbestos, was the most widely used form of asbestos in industrial products during the mid-twentieth century and was valued for its heat resistance, tensile strength, and binding properties—characteristics that made it well suited for refractory applications where materials were subjected to extreme and sustained temperatures.

In castable and gunnable refractory products, asbestos fibers served multiple functions. They reinforced the matrix against thermal cracking, improved the material’s resistance to spalling under rapid temperature changes, and enhanced adhesion when the product was applied to vertical or overhead surfaces by gunning. The calcium silicate base provided the structural and insulating framework, while chrysotile fibers were distributed throughout to stabilize the cured lining under operational stresses.

AHERA and OSHA regulatory frameworks subsequently classified chrysotile asbestos as a known carcinogen associated with mesothelioma, asbestosis, and lung cancer when its fibers become airborne and are inhaled. Products containing asbestos in a bonded matrix can release respirable fibers when mixed, applied, cut, drilled, broken apart, or disturbed during removal and demolition activities.

How Workers Were Exposed

Multiple occupational groups encountered Kast-O-Lite Gunning Refractory during its production years, with exposure occurring at several stages of the product’s use cycle.

Refractory workers (brickies) were among the most directly and consistently exposed. These tradespeople mixed dry refractory materials with water, loaded gunning machines, applied Kast-O-Lite to furnace surfaces, and performed finishing work on cured linings. Mixing dry powder containing chrysotile asbestos generated airborne dust in close proximity to the worker, and gunning operations could disperse fine particles throughout enclosed furnace interiors.

Steel mill furnace workers worked alongside refractory crews during furnace relining and repair outages. They operated in the same confined spaces where Kast-O-Lite was being applied or removed, and they routinely handled adjacent components while freshly gunned or deteriorating linings were present.

Aluminum plant workers encountered Kast-O-Lite in the lining and maintenance of aluminum smelting pots and associated high-temperature equipment. The aluminum industry was a significant market for gunnable refractories, and workers in these facilities experienced comparable exposure patterns to those in steel production.

Boilermakers installed and maintained boiler systems lined with or adjacent to refractory materials including Kast-O-Lite. Their work frequently involved breaking out old refractory linings—a demolition task that could liberate asbestos fibers from cured material—as well as being present during gunning operations in boiler settings.

Ironworkers performed construction and structural work in and around facilities where Kast-O-Lite was actively being applied or where existing linings were being removed. Their exposure was often incidental to refractory installation activities occurring nearby, particularly in shared confined spaces with limited ventilation.

Exposure risk was compounded by the working conditions typical of the era. Industrial hygiene controls, respiratory protection, and worker awareness of asbestos hazards were largely absent in facilities using these products through the 1960s. Furnace interiors and boiler rooms where refractory work took place were often enclosed and poorly ventilated, concentrating airborne fibers and prolonging worker exposure during each work cycle.

Documented Trust Fund / Legal Options

A.P. Green Industries filed for bankruptcy reorganization in 2002, in part as a result of the substantial volume of asbestos personal injury claims filed against the company arising from its refractory product lines, including Kast-O-Lite. As part of the bankruptcy resolution, the A.P. Green Industries Asbestos Settlement Trust was established to evaluate and compensate eligible claimants who can demonstrate exposure to A.P. Green asbestos-containing products and a qualifying asbestos-related disease.

Kast-O-Lite Gunning Refractory is a named and documented product within the trust’s product identification records. Claimants filing against the A.P. Green Trust should be prepared to provide:

• A confirmed medical diagnosis of an asbestos-related disease, such as mesothelioma, asbestosis, lung cancer, or other qualifying condition
• Documented or affidavit-based evidence of occupational exposure to Kast-O-Lite or other A.P. Green products during the covered production period
• Employment history placing the claimant at a facility and in a role where Kast-O-Lite was in use

Eligible claim categories typically include mesothelioma claims, lung cancer claims, and nonmalignant disease claims, with differing scheduled and individual review values assigned based on disease severity and exposure documentation. Family members of deceased workers who handled or worked near Kast-O-Lite may also have standing to file claims on behalf of the decedent’s estate.

Workers across all five exposed trades—refractory workers, steel mill furnace workers, aluminum plant workers, boilermakers, and ironworkers—have documented pathways to file with the A.P. Green Industries Asbestos Settlement Trust based on verified Kast-O-Lite exposure. Claimants with questions about eligibility, documentation requirements, or filing deadlines should consult a qualified asbestos attorney experienced in trust fund claims.