Product Description

Stokes Machinery Company was a leading American manufacturer of compression, transfer, and closure molding presses used in phenolic molding plants from the 1930s through the 1980s. Stokes presses came in multiple capacity configurations — including 50-ton transfer, 200-ton transfer, 150-ton compression, and 250-ton closure machines — and were standard equipment across the U.S. phenolic-molding industry.

Stokes equipment was used in the molding of asbestos-filled phenolic compounds — the thermoset matrix used for electrical switchgear arc chutes, barrier insulators, panelboard backings, breaker housings, and other heat-resistant electrical and industrial moldings. Per publicly filed allegations in U.S. asbestos litigation, Stokes phenolic presses were installed at Square D Company plants in Cedar Rapids, Iowa; Peru, Indiana, and other Square D facilities, as well as at independent phenolic molders nationwide.

Stokes has appeared as a corporate defendant in publicly filed U.S. asbestos litigation.

Asbestos Content

Plaintiffs alleged in publicly filed asbestos litigation that Stokes phenolic molding presses incorporated asbestos in one or more of the structural roles common to compression and transfer presses of the era:

Heated platen insulation — Stokes compression and transfer presses used steam-heated or electric-heated platens operating at 300°F to 400°F to cure the phenolic compound in the mold cavity. Plaintiffs alleged the platens were insulated with asbestos-containing material.

Steam-jacket gaskets and packing — Steam-heated platen systems used asbestos-bearing gaskets at flange joints, packing at valve stems, and rope packing at shaft seals.

Steam supply line insulation — The steam supply and condensate return piping serving the platens was alleged to be wrapped in asbestos-containing pipe insulation.

Press frame and tie-rod insulation — In some configurations, the structural press frame near the heated platens was alleged to include asbestos lagging.

Preheater insulation — Thermex and Mytron preheater assemblies used alongside Stokes presses to preheat phenolic preforms before molding were alleged to incorporate asbestos insulation.

How Workers Were Exposed

Phenolic press operators, plant maintenance mechanics, millwrights, and pipefitters were exposed during multiple Stokes-related operations:

  • Gasket replacement — Platen flange gaskets and steam-line gaskets were periodically replaced; workers scraped and cut asbestos sealing material.
  • Insulation removal and repair — Torn or damaged platen insulation required stripping and replacement of asbestos-bearing material.
  • Mold changes — Required leaning over hot platens and disturbing asbestos-bearing insulation in the immediate breathing zone.
  • Steam-line repair — Pipefitters working on steam supply, condensate return, and valve trim disturbed asbestos pipe insulation.
  • Cure-cycle interactions — Operators standing at the press during cure cycles were exposed to fiber released from disturbed platen insulation.
  • Press rebuilding — Major rebuilds required stripping all asbestos-bearing insulation and gasket material.

Plaintiffs alleged that phenolic press operators, mold setters, plant maintenance mechanics, millwrights, pipefitters, plant electricians, and bystander workers — including tumbler, deflash, and machining operators working in adjacent areas — were exposed to airborne asbestos fiber during these routine activities.

Plants Where Stokes Phenolic Presses Were Installed

Per publicly filed allegations in U.S. asbestos litigation, Stokes 50-ton transfer, 200-ton transfer, and 150-ton compression phenolic molding presses are documented at the Square D Cedar Rapids, Iowa plant — including in the alleged 1959 consolidation transfer of asbestos-filled phenolic molding capacity from Square D’s Peru, Indiana plant to Cedar Rapids. Stokes presses were standard equipment at electrical switchgear, breaker, and panelboard manufacturers — including Square D, Westinghouse, General Electric, and independent phenolic molders nationwide.

This information reflects facility history, exposure pathways, and product documentation drawn from publicly filed asbestos litigation, federal regulatory records, and industry archives. It does not constitute a finding of fact or liability with respect to any specific manufacturer, supplier, or facility operator.

Documented End-User Plants and Worker Populations

Stokes phenolic compression, transfer, and closure molding presses were the dominant U.S. phenolic-press line and were installed across virtually every major U.S. phenolic-molding plant of the asbestos era. Stokes-related worker exposure occurred at:

Electrical Switchgear and Panelboard Manufacturers

  • Square D Company — per publicly filed asbestos litigation allegations, Stokes 50-ton transfer, 200-ton transfer, and 150-ton compression phenolic molding presses are documented at the Square D Cedar Rapids, Iowa plant (including the alleged 1959 consolidation transfer of asbestos-filled phenolic molding capacity from Square D’s Peru, Indiana plant), and Stokes presses were also installed at Square D Columbia, Missouri, Lincoln, Nebraska, Middletown, Ohio, Lexington, Kentucky, and Asheboro, North Carolina facilities
  • Westinghouse Electric Corporation — phenolic molding for circuit breakers, switchgear, and Micarta laminate at multiple Westinghouse plants
  • General Electric Company — phenolic molding for GE electrical switchgear and components
  • Federal Pacific Electric Company and other independent U.S. switchgear molders

Other Phenolic-Molding End-User Industries

  • Independent phenolic-molding houses — supplying asbestos-filled phenolic moldings to U.S. electrical, appliance, automotive, and industrial OEMs
  • Phenolic appliance-component molders — handles, knobs, switches, timer housings, terminal blocks for consumer and commercial appliances (Toastmaster, McGraw-Edison, Sunbeam, Hamilton Beach, GE Small Appliance, Westinghouse Small Appliance)
  • Phenolic automotive-component molders — distributor caps, ignition components, fuse blocks, terminal blocks, and other underhood phenolic moldings for U.S. automotive OEMs and tier-one suppliers
  • Phenolic industrial-component molders — supplying phenolic-asbestos parts to industrial OEMs

Worker Populations Across All End-User Plants

Phenolic press operators, mold setters, plant maintenance mechanics, millwrights, pipefitters, plant electricians, tumbler/deflash/machining operators, and bystander workers at all of these end-user plants were exposed to airborne asbestos fiber from Stokes platen insulation, steam-jacket gaskets and packing, steam-line insulation, and accumulated phenolic-asbestos compound dust during routine press operation, mold changes, cure cycles, and press rebuild work throughout the asbestos era.

All The Ways Someone May Have Been Exposed to Stokes Phenolic-Press Asbestos-Bearing Components

Stokes phenolic compression and transfer presses were installed across virtually every U.S. phenolic-molding plant of the asbestos era. The exposure-pathway catalog covers:

Phenolic-Molding Plant Direct Worker Exposure

  • Phenolic press operators — running 50-ton transfer, 200-ton transfer, 150-ton compression, and 250-ton closure presses
  • Mold setters and mold-change workers — installing, removing, and changing phenolic molds in heated press platens
  • Preform-handling operators — loading asbestos-filled phenolic preforms into Thermex and Mytron preheaters and into press cavities
  • Cure-cycle and discharge operators — running cure cycles and discharging cured phenolic parts
  • Tumbling, deflashing, and machining operators — finishing cured phenolic parts releases asbestos fiber from the molded matrix
  • Phenolic-compound hopper-loaders and material handlers — transferring asbestos-filled phenolic compound from drums and bags to press hoppers
  • Press-bay maintenance mechanics, millwrights, and pipefitters — servicing steam-jacketed platens, steam supply, condensate return, and press hydraulics
  • Plant electricians — servicing heated-platen heaters, thermocouples, contactors, and control panels
  • Plant boiler-room steam-system technicians — generating and distributing steam to Stokes presses
  • Used-equipment dealers and machine rebuilders — refurbishing used Stokes presses for resale

Specifically Named Phenolic-Molding End-User Plants

  • Square D Company — Cedar Rapids IA (Stokes 50-ton transfer, 200-ton transfer, 150-ton compression per the alleged 1959 consolidation transfer from Peru IN); Peru IN; Columbia MO; Lincoln NE; Middletown OH; Lexington KY; Asheboro NC
  • Westinghouse Electric Corporation — phenolic molding for circuit breakers, switchgear, and Micarta laminate at multiple Westinghouse plants
  • General Electric Company — phenolic molding for GE switchgear and electrical components
  • Federal Pacific Electric Company — phenolic molding for switchgear
  • Independent phenolic-molding houses — Plenco, Durez, Rogers Corporation, GE Phenolic, Monsanto Resinox, Union Carbide / Bakelite, Reichhold, Allied Chemical (Plaskon), and others
  • Phenolic appliance-component molders — supplying McGraw-Edison Toastmaster (Boonville MO, Macon MO), Sunbeam, Hamilton Beach, GE Small Appliance, Westinghouse Small Appliance with phenolic switch housings, timer bodies, handles, knobs, and terminal blocks
  • Phenolic automotive-component molders — distributor caps, ignition components, fuse blocks, terminal blocks
  • Phenolic industrial-component molders — supplying phenolic-asbestos parts to industrial OEMs

Plant Maintenance, Service, and Auxiliary Worker Exposure

  • Plant maintenance electricians — servicing heated-platen heating systems and press control panels
  • Plant steam-and-process-piping crews — servicing steam supply, condensate return, and chilled-water lines feeding Stokes platens
  • Plant compressed-air-system technicians — servicing pneumatic systems
  • Plant janitorial and housekeeping crews — cleaning accumulated phenolic-asbestos compound dust
  • Plant cafeteria, security, and front-office personnel — bystander exposure to indoor airborne compound dust

Used-Equipment, Auction, and Equipment-Relocation Exposure

  • Plant-closure auction workers — removing Stokes presses during plant-closure auctions
  • Used-machinery rebuild shops — refurbishing used Stokes presses for resale
  • Equipment-relocation riggers — disassembling, transporting, and reassembling Stokes presses during plant consolidations (including the alleged 1959 Square D Peru IN to Cedar Rapids IA consolidation)

Worker Family, Take-Home, and Bystander Exposure

  • Spouses laundering work clothes of phenolic-molding plant workers
  • Children and other family members — household-level airborne fiber from contaminated work clothes
  • Carpool partners of phenolic-molding workers

Community and Environmental Exposure

  • Phenolic-molding-plant community residents — community ambient-air exposure near Cedar Rapids IA, Peru IN, Columbia MO, Lincoln NE, Middletown OH, and other historical phenolic-molding-plant locations
  • Demolition crews demolishing former phenolic-molding plants — disturbing accumulated phenolic-asbestos compound dust and asbestos-bearing platen insulation

Regulatory, Research, and Litigation-Support Contact

  • OSHA inspectors and industrial hygienists at phenolic-molding plants
  • NIOSH researchers studying phenolic-molding occupational health
  • EPA Superfund contractors at former phenolic-molding-plant sites