Narcogun CR-346 Spray Fireproofing

Product Description

Narcogun CR-346 was a spray-applied fireproofing product manufactured by Narco during the period from approximately 1965 to 1975. Spray-applied fireproofing materials of this type were widely used in commercial and industrial construction during the mid-twentieth century as a cost-effective method of providing passive fire protection to structural steel components, including beams, columns, and decking systems.

Products like the Narcogun CR-346 were typically applied using specialized spray equipment that delivered a mixture of fireproofing compound and water directly onto structural surfaces. Once cured, the material formed an insulating layer capable of delaying the transfer of heat to load-bearing steel elements in the event of a fire, thereby extending the time available for building evacuation and emergency response. This application method was considered highly efficient for large-scale industrial and commercial construction projects, and spray fireproofing became a dominant method for structural fire protection during the decade that Narcogun CR-346 was produced.

The product was marketed and sold during a period when asbestos-containing spray fireproofing materials were commonplace across the construction industry. Regulatory oversight of asbestos in building products was limited during much of this production window, and the health hazards associated with asbestos exposure were not yet reflected in binding federal standards applicable to most workplaces. The Occupational Safety and Health Administration (OSHA) did not establish its first permissible exposure limits for asbestos until 1971, and even those initial standards were later recognized as insufficient to protect worker health.

Asbestos Content

Narcogun CR-346 contained chrysotile asbestos as a primary component of its formulation. Chrysotile, sometimes referred to as white asbestos, is a serpentine-form asbestos mineral that was the most widely used variety in commercial products throughout the twentieth century. It was valued in spray fireproofing applications for its fibrous structure, heat resistance, and ability to bond with binder materials to create a durable insulating matrix.

Despite its widespread use, chrysotile asbestos is classified as a known human carcinogen by the International Agency for Research on Cancer (IARC) and is regulated as a hazardous material under multiple federal frameworks, including OSHA’s asbestos standards (29 CFR 1910.1001 and 29 CFR 1926.1101) and the Asbestos Hazard Emergency Response Act (AHERA). Inhalation of chrysotile fibers has been associated with serious and frequently fatal diseases, including malignant mesothelioma, asbestosis, lung cancer, and other asbestos-related conditions.

Spray-applied fireproofing products that contained asbestos were subject to a gradual regulatory phase-out beginning in the early 1970s. The U.S. Environmental Protection Agency began restricting the use of asbestos-containing spray-applied surfacing materials in 1973, and the production period documented for Narcogun CR-346 — ending in 1975 — coincides with this broader industry transition away from asbestos-containing spray fireproofing.

How Workers Were Exposed

Industrial workers represent the primary occupational group documented in connection with exposure to Narcogun CR-346. Exposure pathways associated with spray-applied fireproofing products are well established in occupational health and litigation records, and they generally fall into several categories: primary application exposure, bystander exposure, and disturbance exposure during renovation or demolition activities.

Application Exposure: Workers who mixed, loaded, and sprayed Narcogun CR-346 using spray equipment were directly exposed to high concentrations of airborne asbestos fibers. The spraying process is mechanically energetic and generates significant fiber release; in enclosed or partially enclosed industrial environments, airborne fiber concentrations could reach levels far exceeding what would later become permissible under federal law. Workers operating spray equipment, as well as those handling dry bags of material prior to mixing, faced the greatest exposure intensity.

Bystander Exposure: Industrial worksites are inherently multi-trade environments. Workers present in the vicinity of spray fireproofing operations — including pipefitters, electricians, ironworkers, and general laborers — could inhale airborne asbestos fibers without directly handling the product. Overspray and settled dust from spray fireproofing operations could contaminate nearby work areas, extending the exposure zone well beyond the immediate application site.

Disturbance Exposure During Maintenance and Renovation: In facilities where Narcogun CR-346 had been applied to structural elements, subsequent maintenance activities, equipment installation, and renovation or demolition work created additional exposure opportunities. Cutting, drilling, scraping, or otherwise disturbing cured fireproofing material can release previously bound asbestos fibers. Workers who disturbed installed fireproofing material in later decades — potentially without knowledge that it contained asbestos — may have experienced significant fiber exposure.

The latency period for asbestos-related diseases is typically measured in decades, meaning that workers exposed to Narcogun CR-346 during its production and application window of 1965 to 1975 may not have received a diagnosis of an asbestos-related condition until the 1990s, 2000s, or later.

Documented Trust Fund / Legal Options

Narcogun CR-346 is a Tier 2 product for purposes of asbestos litigation and compensation. No asbestos bankruptcy trust fund has been established specifically to compensate individuals harmed by this product. Compensation claims associated with Narcogun CR-346 must therefore be pursued through the civil litigation system rather than through the administrative claims process available for trust fund products.

Litigation records document claims filed by industrial workers and others alleging injury from exposure to Narcogun CR-346 and comparable asbestos-containing spray fireproofing products. Plaintiffs alleged that Narco and related parties knew or should have known of the health hazards associated with asbestos-containing products during the years of manufacture and failed to provide adequate warnings to workers who would foreseeably encounter the product during application, maintenance, and renovation work.

Plaintiffs in asbestos litigation involving spray fireproofing products have generally alleged causes of action including negligence, strict products liability for design defect and failure to warn, and in some cases breach of warranty. Litigation records document that such claims have proceeded in state and federal courts across multiple jurisdictions.

Individuals who were exposed to Narcogun CR-346 and who have been diagnosed with mesothelioma, lung cancer, asbestosis, or another asbestos-related disease should consult with a qualified asbestos litigation attorney. Given the statutes of limitations applicable to asbestos personal injury claims — which vary by state and are typically measured from the date of diagnosis rather than the date of exposure — prompt legal consultation is important. An experienced asbestos attorney can evaluate exposure history, identify all potentially liable parties, and assess the full range of legal remedies available, which may include claims against multiple manufacturers, suppliers, and premises owners in addition to any applicable trust fund claims arising from other products encountered during a worker’s career.

This article is provided for informational and reference purposes only. It does not constitute legal advice. Individuals seeking compensation for asbestos-related illness should consult a licensed attorney.