Armstrong Limpet Spray

Product Description

Armstrong Limpet Spray was a spray-applied fireproofing and thermal insulation material manufactured and distributed by A.C. and S., Inc. (Asbestos Corporation of South America, later known as Armstrong Contracting and Supply Corporation). The product was used extensively in industrial construction settings from 1957 through 1974, a period during which spray-applied asbestos fireproofing was a standard method for protecting structural steel and other building components from fire damage.

Limpet Spray was applied using specialized pneumatic spray equipment that projected a wet mixture of asbestos fibers and binders onto structural surfaces. The resulting coating provided both fire resistance and thermal insulation. It was used on steel beams, columns, decking, and other structural components in factories, power plants, shipyards, refineries, and other heavy industrial facilities. The product was marketed under the “Limpet” trade name, a designation shared with similar spray asbestos products in use across the United Kingdom and North America during the same era.

A.C. and S., Inc. operated as both a manufacturer and a contracting firm, meaning the company not only produced asbestos-containing materials but also deployed crews to apply those materials on job sites. This dual role placed A.C. and S. workers and contractor employees in direct, sustained contact with the product during application operations.

Production and application of Armstrong Limpet Spray continued until 1974, when mounting regulatory pressure, evolving occupational health standards, and growing awareness of asbestos-related disease risks contributed to the phase-out of spray-applied asbestos products across the industry.

Asbestos Content

Armstrong Limpet Spray contained chrysotile asbestos as its primary fibrous component. Chrysotile, also known as white asbestos, is a serpentine-form mineral fiber that was widely used in spray fireproofing formulations due to its heat resistance, tensile strength, and binding characteristics. In spray-applied products of this type, asbestos fiber content could constitute a substantial proportion of the material by weight, providing the structural and thermal properties that made the product commercially viable.

Chrysotile fibers, once considered less hazardous than amphibole forms of asbestos such as amosite or crocidolite, are recognized by the International Agency for Research on Cancer (IARC), the U.S. National Toxicology Program, and regulatory agencies including the U.S. Environmental Protection Agency (EPA) as known human carcinogens. Regulatory frameworks including AHERA (the Asbestos Hazard Emergency Response Act) and OSHA’s asbestos standards apply to chrysotile-containing materials and establish exposure limits and handling protocols that reflect the fiber’s documented health risks.

When applied via spray, and particularly when disturbed during demolition, renovation, or maintenance activities following installation, chrysotile fibers from Limpet Spray could become airborne in concentrations far exceeding permissible exposure limits established under later OSHA standards.

How Workers Were Exposed

Industrial workers employed in facilities where Armstrong Limpet Spray was applied or where previously installed coatings were later disturbed faced the greatest documented exposure risk. Exposure pathways were multiple and varied depending on a worker’s trade and the nature of their work activities.

During Application: Workers who operated spray equipment or worked in proximity to active spraying operations were exposed to high concentrations of airborne asbestos dust. The pneumatic spray process involved mixing dry asbestos-containing materials with water and propelling the mixture through hoses and nozzles at considerable velocity. This process generated significant overspray and aerosolized fiber release into the surrounding work area. Workers without adequate respiratory protection — a common condition during the product’s years of manufacture and application — inhaled these fibers directly.

During Maintenance and Repair: Industrial maintenance workers employed at facilities where Limpet Spray had been applied to structural steel were frequently required to drill, cut, grind, or otherwise disturb the hardened fireproofing coating. These activities released previously bound asbestos fibers back into the air. Maintenance workers performing these tasks often had no awareness that the coating material contained asbestos, and respiratory protection was inconsistently provided or enforced.

During Demolition and Renovation: As industrial facilities were upgraded, modified, or demolished in the decades following the product’s installation, construction and demolition workers encountered applied Limpet Spray coatings in deteriorating or intact condition. Mechanical disturbance of these coatings during abatement — or removal work performed without proper abatement protocols — released chrysotile fibers in potentially hazardous concentrations.

Bystander Exposure: Workers in adjacent trades who were present in work areas where Limpet Spray was being applied or disturbed, but who were not directly involved in those operations, may also have been exposed through inhalation of fibers traveling through shared airspace.

The latency period for asbestos-related diseases — typically ranging from 10 to 50 years between initial exposure and clinical diagnosis — means that workers exposed to Armstrong Limpet Spray during the product’s active use years (1957–1974) may be receiving diagnoses of mesothelioma, asbestosis, lung cancer, or other asbestos-related conditions decades after their last exposure.

Documented Trust Fund / Legal Options

Armstrong Limpet Spray is a Tier 2 product for purposes of this reference guide. No asbestos bankruptcy trust fund has been established specifically for claims arising from this product or from A.C. and S., Inc. Accordingly, individuals seeking compensation for asbestos-related illness connected to this product must pursue remedies through civil litigation rather than through trust fund claims processes.

Litigation records document that A.C. and S., Inc. has been named as a defendant in asbestos personal injury and wrongful death lawsuits filed across multiple jurisdictions. Plaintiffs alleged that A.C. and S. knew or should have known of the health hazards associated with asbestos fiber inhalation and failed to adequately warn workers, contractors, or end users of those risks. Plaintiffs further alleged that the company continued to manufacture, market, and apply Armstrong Limpet Spray despite the availability of internal and published scientific evidence linking asbestos exposure to serious pulmonary disease and malignancy.

Litigation records also document claims asserting that A.C. and S. failed to provide adequate respiratory protection to its own application crews, failed to implement engineering controls sufficient to reduce fiber release during spray operations, and failed to communicate hazard information to employers and workers at facilities where the product was applied.

Individuals diagnosed with mesothelioma, asbestosis, lung cancer, or pleural disease who have documented occupational exposure to Armstrong Limpet Spray — whether as direct application workers, industrial maintenance workers, or bystanders in facilities where the product was used — may have viable legal claims against responsible parties. Because A.C. and S. has also been named in connection with other asbestos-containing products, legal counsel experienced in asbestos litigation may identify additional defendants or exposure sources relevant to an individual claimant’s history.

Persons seeking to evaluate their legal options should consult with an attorney specializing in asbestos personal injury litigation. Statutes of limitations governing asbestos claims vary by state and typically begin running from the date of diagnosis rather than the date of exposure; prompt consultation is advisable.