Composition of Bituminous Fiber Ducts (BFD)

BFDs consist of: Asphalt-impregnated paper

Multiple layers of paper are saturated with asphalt to create a flexible and durable conduit.

Bituminous binder

A mixture of asphalt and other hydrocarbons acts as an adhesive, holding the paper layers together.

Fiber reinforcement

Glass or asbestos fibers are added to increase strength and prevent splitting.

History and Manufacturing

BFDs were commonly used in the 1960s and 1970s for underground cable installations. They were manufactured by impregnating paper with hot asphalt in a continuous process. The paper was then wound onto a mandrel and reinforced with fibers. The conduits were typically 4-12 inches in diameter.

Asbestos Content

Asbestos was widely used in construction materials, including BFDs, prior to the 1980s. BFDs that were manufactured before 1985 may therefore contain asbestos fibers. The amount of asbestos varies depending on the specific manufacturer and batch.

Potential Hazards

Asbestos fibers can become airborne when BFDs are cut, drilled, or broken. Inhalation of asbestos fibers can lead to serious health problems, including lung cancer, mesothelioma, and asbestosis.

Worker Safety

Workers handling BFDs should be aware of the potential asbestos hazard and take appropriate precautions: Presume all BFDs contain asbestos unless proven otherwise. Wear appropriate personal protective equipment (PPE) such as respirators, gloves, and protective clothing. Use wet methods to minimize dust generation when cutting or drilling BFDs. Dispose of used materials in accordance with local regulations for asbestos-containing waste.

Additional Information The Environmental Protection Agency (EPA) has regulations for the handling and disposal of asbestos-containing materials. The National Institute for Occupational Safety and Health (NIOSH) provides guidelines for worker protection against asbestos exposure. A qualified environmental consultant can conduct asbestos testing on BFDs to determine their asbestos content.* If BFDs are found to contain asbestos, they should be handled by a licensed asbestos abatement contractor.

Conclusion

Bituminous fiber ducts (BFDs) can potentially contain asbestos, which is a serious health hazard. Workers handling these materials should take appropriate safety precautions to minimize exposure. Testing should be conducted to determine asbestos content, and appropriate handling and disposal measures should be implemented based on the results. Flag for review