Pipe Insulation — Asbestos Exposure Crosswalk

What This Equipment Is

Pipe insulation (also called pipe covering or pipe lagging) is the thermal jacket wrapped around hot or cold piping to control heat loss / gain, prevent surface burns, prevent sweating, and protect downstream equipment. Industrial steam plants alone might contain miles of insulated piping; refineries and chemical plants contain more.

For most of the twentieth century, the standard pipe-insulation products were asbestos-based:

  • 85% Magnesia pipe covering — hinged sections fitted to pipe OD
  • Calcium silicate pipe covering — hinged or tapered sections
  • Asbestos-cement pipe covering — high-temperature service
  • Fiberglass-asbestos blends — later 1950s–1970s products
  • Insulating cement — finished and patched joints
  • Asbestos cloth and tape — final wrap, removable blankets

Why Pipe Insulation Work Was a High-Exposure Activity

Two distinct exposure pathways: installation and removal.

Installation: New pipe covering arrived as preformed half-sections. The insulator measured, cut to length (a saw or knife generated airborne fiber), fitted the section around the pipe, wired or banded it in place, and finished joints with insulating cement mixed dry on-site. The dry-mixing of cement was the dustiest step.

Removal: Aged, thermally cycled, baked-hard pipe covering is brittle and friable. Stripping it off — for valve repair, pipe replacement, or facility demolition — fractured the material and released dense clouds of fiber. Workers stripping insulation in confined boiler rooms or pipe alleys had some of the highest documented exposures in any industrial trade.

Manufacturers Named in Pipe-Covering Litigation

  • Johns-Manville — magnesia, calcium silicate, asbestos-cement pipe covering
  • Owens-Corning / Fibreboard — Kaylo pipe covering
  • Eagle-Picher — pipe covering
  • Armstrong World Industries — calcium silicate pipe covering
  • Pittsburgh Corning — Unibestos pipe covering
  • Combustion Engineering — insulation products
  • Keene Corporation — pipe covering

Documented Product References

Images sourced from publicly available product-identification reference materials. Inclusion does not constitute a finding of liability against any company.

Trust Funds That May Apply

  • Manville Personal Injury Settlement Trust
  • Owens-Corning / Fibreboard Asbestos PI Trust
  • Eagle-Picher Industries PI Settlement Trust
  • Pittsburgh Corning Corporation Asbestos PI Trust
  • Armstrong World Industries Asbestos PI Settlement Trust
  • Keene Creditors Trust
  • Combustion Engineering 524(g) Asbestos PI Trust

Trades Most Exposed at Pipe Insulation

Insulators (Heat & Frost Insulators), pipefitters working alongside insulators, laborers doing tear-out and demolition, boilermakers during outages, maintenance mechanics.

Jobsites in the Network Documenting Heavy Pipe-Insulation Use

Compiled from publicly filed asbestos litigation, EPA / state-DNR records, and industry-publication histories. Product and company references reflect what has been alleged or documented in publicly filed litigation. This page does not constitute a finding of liability against any company. Not legal advice; consult a licensed attorney about your specific situation.