Product Description
Watson Stillman Company was a U.S. manufacturer of hydraulic injection molding presses during the 1940s through 1970s era. Watson Stillman small-shot machines — including the 6-ounce injection model — were widely installed in plastic molding operations producing electrical components, household products, packaging, and industrial moldings.
Per publicly filed allegations in U.S. asbestos litigation, Watson Stillman injection molding presses incorporated asbestos in components of the heated process system.
Asbestos Content
Plaintiffs alleged that Watson Stillman presses incorporated asbestos in one or more of the structural roles common to small-shot injection machines of the era:
Heating cylinder insulation — The heated injection cylinder operated at process temperatures of 350°F to 600°F. Plaintiffs alleged the cylinder was wrapped in asbestos-containing thermal insulation.
Band heater insulation and gaskets — The electric band heaters clamped around the cylinder were alleged to be insulated and gasketed with asbestos-bearing material.
Nozzle insulation — The heated nozzle was alleged to be wrapped or gasketed with asbestos-containing material.
Hydraulic system gaskets and packing — High-pressure hydraulic flanges and packing were alleged to incorporate asbestos sealing material.
How Workers Were Exposed
Workers were exposed during routine press operation and maintenance:
- Band heater replacement disturbed asbestos cylinder insulation
- Cylinder rewrap during major rebuilds required handling asbestos-bearing material
- Mold changes required working at heated nozzles and platens
- Hydraulic gasket and packing replacement released asbestos fiber
- Heater wiring and electrical maintenance required work in asbestos-insulated areas
- Machine rebuilding for resale required handling asbestos-bearing components
Plaintiffs alleged that plastic molding operators, machine setup workers, mold-change crews, plant maintenance mechanics, millwrights, plant electricians, and bystander workers were exposed to airborne asbestos fiber during these routine activities.
Plants Where Watson Stillman Presses Were Installed
Watson Stillman 6-ounce hydraulic injection molding machines appear in contemporaneous Modern Plastics for-sale equipment listings alongside Reed-Prentice, HPM, Stokes, and Farrel-Birmingham equipment from major U.S. plastics manufacturers — indicating broad distribution into the postwar U.S. plastic molding industry.
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
Watson Stillman small-shot hydraulic injection molding machines were installed across U.S. plastic-molding operations during the 1940s-1970s era. Watson Stillman-related worker exposure occurred at:
Plastic-Molding End-User Industries
- Electrical-component molders — supplying electrical switchgear, breaker, panelboard, terminal-block, and other electrical-distribution-equipment manufacturers (including Square D, Westinghouse, General Electric, Federal Pacific)
- Small-appliance plastic-component molders — supplying toaster, broiler, oven, food-warmer, and other small-appliance manufacturers (including McGraw-Edison Toastmaster facilities)
- Packaging and household-product molders — supplying consumer and household-product industries
- Industrial component molders — supplying industrial OEMs with small-shot molded plastic and phenolic components
- Independent plastic-molding houses — small-shot custom molders nationwide
Worker Populations Across All End-User Plants
Plastic molding operators, machine setup workers, mold-change crews, plant maintenance mechanics, millwrights, plant electricians, and bystander workers at all of these end-user plants were exposed to airborne asbestos fiber from Watson Stillman cylinder insulation, band-heater insulation, and nozzle and hydraulic-system gasket and packing materials during routine press operation, band-heater replacement, and machine rebuild work throughout the asbestos era.
All The Ways Someone May Have Been Exposed to Watson Stillman Asbestos-Bearing Components
Plastic-Molding Plant Direct Worker Exposure
- Plastic-molding press operators running Watson Stillman small-shot (6-oz and other) hydraulic injection machines
- Machine setup workers, mold-change crews, and mold setters
- Phenolic-compound and plastic-pellet hopper-loaders
- Cylinder-rewrap and band-heater replacement workers
- Press-bay maintenance mechanics, millwrights, pipefitters, and plant electricians
- Used-equipment dealers and machine rebuilders
Named End-User Plants and Industries
- Electrical-component molders supplying Square D, Westinghouse, General Electric, Federal Pacific
- Small-appliance plastic-component molders supplying McGraw-Edison Toastmaster, Sunbeam, Hamilton Beach, GE Small Appliance, Westinghouse Small Appliance
- Packaging and household-product molders
- Industrial component molders — supplying industrial OEMs
- Independent small-shot custom molders nationwide
Plant Auxiliary and Bystander Worker Exposure
- Plant boiler-room and steam-system technicians
- Plant compressed-air-system technicians
- Plant janitorial and housekeeping crews
- Plant cafeteria, security, and front-office personnel (HVAC bystander)
Used-Equipment, Auction, and Plant-Closure Exposure
- Plant-closure auction workers removing Watson Stillman presses
- Used-machinery rebuild shops
- Equipment-relocation riggers
Worker Family, Take-Home, and Bystander Exposure
- Spouses laundering work clothes
- Children and household members exposed to take-home fiber
- Carpool partners
Community and Environmental Exposure
- Plastic-molding-plant community residents
- Demolition crews at former plastic-molding plants
Regulatory and Research Contact
- OSHA inspectors and industrial hygienists
- NIOSH plastics-industry researchers
- EPA Superfund contractors