Mizzou GR

Product Description

Mizzou GR was a refractory castable material manufactured by A.P. Green Refractories Company, a Missouri-based producer widely recognized as one of the leading suppliers of high-temperature industrial materials throughout the twentieth century. Produced between approximately 1966 and 1972, Mizzou GR was designed for use in demanding high-heat environments where conventional construction materials could not withstand sustained thermal stress. The product belonged to a broader family of castable refractories — dense, hydraulically bonded mixtures that could be poured or troweled into place and then cured to form a rigid, heat-resistant lining.

Castable refractories like Mizzou GR were used extensively across heavy industry, including steel mills, foundries, petrochemical refineries, glass manufacturing plants, cement kilns, and industrial boiler systems. These environments required lining materials capable of enduring temperatures that would destroy ordinary concrete or brick, and the castable format allowed the material to be shaped to fit complex furnace geometries, ladles, and vessel interiors. A.P. Green marketed Mizzou GR alongside a range of similar products under its well-established Mizzou product line, which carried considerable industry recognition for durability and thermal performance.

During the years of Mizzou GR’s production, the use of asbestos in industrial materials was commonplace and largely unregulated. Manufacturers routinely incorporated asbestos fibers into refractory products to improve performance characteristics such as tensile strength, thermal insulation, and resistance to cracking under rapid temperature fluctuation. A.P. Green’s Mizzou GR reflected that industry-wide practice.

Asbestos Content

Mizzou GR contained chrysotile asbestos, the most commercially prevalent form of asbestos used in industrial products throughout the mid-twentieth century. Chrysotile, sometimes referred to as white asbestos, is a serpentine mineral characterized by long, curly fibers. While industry interests historically argued that chrysotile posed fewer health risks than amphibole varieties such as crocidolite or amosite, scientific and regulatory consensus — including positions held by the International Agency for Research on Cancer (IARC), the U.S. Environmental Protection Agency (EPA), and the Occupational Safety and Health Administration (OSHA) — recognizes chrysotile as a proven human carcinogen associated with mesothelioma, asbestos-related lung cancer, and asbestosis.

In refractory castable products, chrysotile fibers were blended into the base aggregate mixture to enhance the mechanical properties of the cured material and improve its behavior across thermal cycles. The fibers were distributed throughout the product matrix, meaning that any activity that disturbed the material — whether during initial mixing, installation, cutting, grinding, or removal — had the potential to release respirable fibers into the surrounding air.

Litigation records document that A.P. Green manufactured and distributed Mizzou GR during a period when the company had access to, or was developing awareness of, internal and industry-level information concerning the health hazards associated with asbestos exposure. Plaintiffs in subsequent litigation alleged that adequate warnings were not provided to workers who handled the product during its years of manufacture and use.

How Workers Were Exposed

Industrial workers across a range of settings encountered Mizzou GR during its production years from 1966 to 1972, and continued to encounter it in place during later maintenance, repair, and demolition work. Because refractory castables are installed for extended service lives, materials placed during this period remained in active industrial use — and subject to disturbance — for decades beyond the date of manufacture.

Exposure to asbestos fibers from Mizzou GR occurred through several recognized pathways:

Mixing and Preparation. Workers who prepared castable refractory for use mixed the dry powder material with water. During dry mixing and transfer, asbestos-containing dust was released into the breathing zone. Without appropriate respiratory protection — which was rarely mandated or available in industrial settings of that era — workers inhaled airborne chrysotile fibers during this routine preparatory work.

Installation. Applying castable refractory to furnace walls, ladle linings, and vessel interiors involved direct contact with the wet material and generated secondary dust from surrounding dry product. Workers in close proximity to installation activities, even those not directly handling the material, could be exposed through bystander inhalation.

Cutting, Shaping, and Finishing. Once cured, refractory castable required cutting, grinding, or chipping to achieve final dimensions or to repair damaged areas. These mechanical operations on hardened material released substantial quantities of fine asbestos-containing dust. OSHA regulations now recognize that abrasive work on asbestos-containing materials generates among the highest fiber release rates of any occupational activity.

Maintenance and Reline Work. Industrial furnaces and high-temperature vessels require periodic relining. Workers engaged in tearing out spent refractory — often called “reline crews” or “refractory workers” — broke apart and removed hardened castable, releasing accumulated asbestos fiber into enclosed, often poorly ventilated spaces. Litigation records document that industrial facilities across the United States employed workers in these roles who were exposed to A.P. Green refractory products, including materials from the Mizzou product family.

Bystander and Para-Occupational Exposure. General industrial workers who were present in the same facilities — pipefitters, boilermakers, electricians, and others not directly involved in refractory work — could be exposed to asbestos fibers released by nearby refractory operations. Plaintiffs in asbestos litigation have frequently alleged this type of bystander exposure in connection with A.P. Green products.

The latency period for asbestos-related diseases, which commonly ranges from ten to fifty years between first exposure and diagnosis, means that workers exposed to Mizzou GR during its production years from 1966 to 1972 may only have received diagnoses in subsequent decades.

No Asbestos Trust Fund Exists for This Product

A.P. Green Refractories Company did establish an asbestos bankruptcy trust — the A.P. Green Industries Asbestos Settlement Trust — following the company’s Chapter 11 bankruptcy reorganization driven substantially by the volume of asbestos-related litigation the company faced. However, Mizzou GR is classified here as a Tier 2 litigated product, meaning that claims involving this specific product have proceeded primarily through civil litigation rather than through a streamlined trust fund claims process.

Individuals diagnosed with mesothelioma, asbestos-related lung cancer, asbestosis, or other asbestos-caused diseases who have a documented occupational history involving Mizzou GR or other A.P. Green refractory products should consult with an asbestos litigation attorney to evaluate all available legal options. Litigation records document that plaintiffs have alleged failure to warn, negligence, and strict liability in connection with A.P. Green asbestos-containing products. Attorneys experienced in asbestos litigation can assess exposure histories, identify all potentially responsible parties across a claimant’s work history, and determine whether civil litigation, trust fund claims against related entities, or both represent the appropriate avenue for seeking compensation.

Relevant diagnoses that may support a legal claim include:

  • Malignant mesothelioma (pleural, peritoneal, or pericardial)
  • Asbestos-related lung cancer
  • Asbestosis
  • Other asbestos-related pleural diseases

Statutes of limitations for asbestos claims vary by state and typically begin running from the date of diagnosis rather than the date of exposure. Individuals who believe they may have been exposed to Mizzou GR or similar A.P. Green refractory products are encouraged to seek legal consultation promptly to preserve all available rights.