Product Description

A.W. Chesterton Company, headquartered in Groveland, Massachusetts, has manufactured industrial sealing and fluid-handling products for well over a century. Its compression packing product lines were staples in the maintenance stockrooms of power plants, refineries, chemical plants, paper mills, and marine engine rooms. Compression packing was cut from bulk spool stock, coiled into rings, and inserted into the stuffing box of valves — compressed by a gland follower to seal against high-pressure steam, condensate, and process fluids around the reciprocating valve stem.

According to publicly filed asbestos litigation records, Chesterton allegedly manufactured its valve-packing lines with braided or twisted asbestos fibers, most often chrysotile, sometimes reinforced with graphite or lubricants. Because the asbestos was integral to the braid, cutting, coiling, and removal allegedly disturbed the fiber matrix directly.

Workers Exposed

Pipefitters, steamfitters, and plant maintenance mechanics allegedly repacked Chesterton-supplied valves on a routine schedule. Digging out heat-cycled, brittle old packing with picks and hooks allegedly generated visible dust in the immediate breathing zone. Cutting fresh packing from the spool allegedly released additional fibers.

Refinery and chemical-plant pipefitters allegedly worked around Chesterton packing in continuous-duty valve service. Boiler-room mechanics and utility pipefitters allegedly repacked feedwater, condensate, and steam valves throughout their careers. Litigation records allege Chesterton knew of the hazard and failed to warn foreseeable users.