Product Description

Corning Incorporated (Corning, New York — founded 1851 as Corning Glass Works) is the manufacturer of the Pyrex borosilicate laboratory glassware line that became the U.S. standard for round-bottom flasks, distillation columns, condensers, reaction kettles, and hot-process laboratory vessels through the 20th century. Corning Pyrex sizes — 250 mL, 500 mL, 1 L, 2 L, 5 L, 12 L, 22 L, 50 L round-bottom and reaction-kettle vessels — became the sizing standard against which laboratory heating mantles were designed and marketed.

Plaintiffs alleged in publicly filed U.S. asbestos personal-injury and wrongful-death litigation that laboratory heating mantles sized and marketed to fit Corning Pyrex round-bottom flasks and reaction vessels used woven or knit asbestos fabric as the heating-element carrier and as the insulating cover between the mantle heating wire and the outer housing. Laboratory technicians, research chemists, pilot-plant operators, and pharmacy compounders who handled asbestos-fabric heating mantles around Pyrex glassware were exposed to airborne asbestos fibers.

The heating-mantle exposure pathway is documented in the litigation record: the mantle’s woven asbestos-fabric inner surface directly cradles the round-bottom flask during heating cycles, wearing progressively with each glassware insertion and removal. As the fabric abrades against successive Pyrex flasks — sometimes hundreds of setups over a mantle’s service life — respirable fibers are released from the abrasion sites into the laboratory bench-top breathing zone. End-of-life mantle disposal, in which the operator handles the visibly frayed asbestos fabric during removal, is a second documented release event.

Corning has been named as a Manufacturer Defendant in publicly filed U.S. asbestos personal-injury and wrongful-death litigation for its Pyrex laboratory glassware line and related laboratory-market products.

Workers Exposed

  • Laboratory technicians running distillations, refluxes, and reactions in Corning Pyrex flasks heated on asbestos-fabric mantles
  • Research chemists in academic, pharmaceutical, petrochemical, and government-lab settings
  • Pilot-plant operators running scaled-up glass-reactor and glass-distillation experiments
  • Pharmacy compounding technicians performing hot-process compounding in Pyrex glassware
  • University teaching-lab staff setting up undergraduate and graduate organic-chemistry stations
  • Quality-control laboratory technicians in food, beverage, brewery, refinery, and chemical-plant labs