Micarta FBG

Product Description

Westinghouse Micarta FBG was a high-grade asbestos-paper phenolic laminate produced for premium industrial electrical insulation applications. The FBG designation indicated a denser, higher-performance asbestos-paper construction than the FBE grade, with improved electrical breakdown strength at elevated temperatures.

Micarta FBG was specified for high-voltage switchgear, large transformer construction, industrial motor commutator insulation, and aerospace electrical assemblies. The grade’s typical applications involved heavy machining at downstream fabricators.

Asbestos Content

Litigation records document that Micarta FBG was alleged to have contained asbestos fiber as a functional filler or reinforcing agent. Asbestos fibers were incorporated into industrial materials of this category to enhance heat resistance, mechanical strength, dimensional stability under thermal cycling, and electrical-insulation properties.

Plaintiffs alleged that asbestos fibers in Micarta FBG were typically chrysotile, amosite, or a combination thereof — consistent with industry practice for the asbestos era. When the cured material was subjected to mechanical operations (drilling, grinding, sanding, machining, cutting) or when raw material was handled and processed, those fibers could become airborne.

How Workers Were Exposed

Litigation records document multiple exposure pathways for workers who handled Micarta FBG:

Raw material handling: Workers who received, weighed, blended, or transferred the material in production environments could disturb settled asbestos fibers and generate airborne dust.

Manufacturing operations: Workers operating the production equipment — molding presses, lamination presses, compounding mixers, cutting saws — were exposed during normal operation, equipment cleaning, and routine maintenance.

Machining and finishing of finished material: Secondary operations including drilling, reaming, turning, grinding, sanding, sawing, and routing of Micarta FBG generated fine dust containing asbestos fibers. These operations were performed by machinists, toolmakers, electricians, and assembly workers who may not have been informed that the material contained asbestos.

Maintenance and tooling work: Maintenance workers responsible for cleaning equipment, servicing presses and mixers, and disposing of accumulated dust in facilities that produced or processed Micarta FBG could encounter substantial exposure during cleaning and repair operations.

The occupational exposures associated with asbestos-containing industrial laminates and molding compounds are consistent with patterns recognized by OSHA and NIOSH. The latency period for asbestos-related diseases is typically 20-50 years between initial exposure and diagnosis, meaning workers exposed to products like Micarta FBG during the mid-twentieth century may be receiving diagnoses today.

See also

References to manufacturers, products, and litigation history reflect what has been alleged or documented in publicly filed asbestos litigation. This information does not constitute a finding of fact or liability.