Asbestos was used because it was a nearly perfect industrial material: fireproof, incredibly strong, resistant to chemicals and electricity, flexible enough to weave into fabric, and cheap to mine. No single synthetic alternative could match that combination of properties, which is why asbestos found its way into over 3,000 different products across construction, manufacturing, shipbuilding, and everyday consumer goods throughout the 20th century. U.S. consumption peaked in 1973 at 794,000 metric tons in a single year.
The Properties That Made It So Useful
Asbestos is a naturally occurring mineral that forms in thin, flexible fibers. Those fibers have an unusual set of characteristics that made them valuable across dozens of industries. They resist heat and flame without melting or burning. They have high tensile strength, meaning they hold up under stress and friction. They insulate against heat, electricity, and sound. They resist corrosion from acids, alkalis, and other harsh chemicals. And they don’t break down biologically, meaning rot, mold, and bacteria can’t degrade them.
Perhaps most importantly, asbestos fibers are flexible enough to be woven into cloth, mixed into cement, or sprayed onto surfaces. This versatility meant manufacturers could incorporate asbestos into almost any product that needed to withstand heat, fire, or chemical exposure. And because the mineral is abundant in nature, it was remarkably inexpensive compared to engineered alternatives.
Construction and Building Materials
The construction industry consumed more asbestos than any other sector. Commercial use in the United States began around 1880, and by the mid-20th century, asbestos appeared in building products of nearly every type. Mixed with Portland cement, it created boards and panels that were fireproof, rot-proof, and far more durable than wood. These asbestos cement products lined walls, covered roofs, and served as siding on homes and commercial buildings.
The specific applications were remarkably varied. Floor tiles, ceiling tiles, and deck coverings all used asbestos for durability and fire resistance. Laboratory and industrial table tops were made from asbestos cement because the material resisted both heat and chemical spills, marketed as “stronger than stone” with “built-in” chemical resistance. Switchboards and panel boards used asbestos sheets for electrical insulation. Even chalkboards were manufactured from asbestos cement because of its tough, long-lasting surface.
One of the most widespread construction uses was sprayed-on fireproofing for structural steel. In high-rise buildings, steel beams lose their strength when exposed to fire. A layer of sprayed asbestos insulation could protect those beams long enough to prevent structural collapse, earning buildings a Class A fire rating. This application alone put asbestos into the bones of thousands of office towers, apartment buildings, and public structures built between the 1950s and 1970s.
Shipbuilding and Military Vessels
Naval ships during World War II relied heavily on asbestos. The material was lightweight, inexpensive, and solved the two biggest problems on a warship: fire and extreme heat from engines and boilers. Over 3,300 U.S. Navy vessels used asbestos-containing materials throughout their construction.
Asbestos appeared in virtually every section of these ships. Boiler rooms and engine rooms used it for insulation and lagging. It lined steel walls, plates, and doors. It wrapped pipes and covered turbines. It appeared in gaskets, valves, pumps, cables, electrical wiring coatings, caulking, and paint. Even the ceiling tiles, floor tiles, and deck coverings contained asbestos. For the Navy, there was simply no other material that could insulate against extreme heat, resist saltwater corrosion, prevent fires, and do all of it at low cost and light weight.
Brake Pads and Automotive Parts
Braking generates enormous heat through friction, and asbestos handled both beautifully. As a reinforcing fiber in brake pads and clutch plates, asbestos provided a stable friction coefficient across a wide range of temperatures, pressures, and speeds. The pads wore down slowly, performed consistently, and didn’t catch fire. This combination of heat resistance, durability, and reliable friction made asbestos the standard material in automotive braking for decades.
Beyond brakes, asbestos appeared in gaskets, hood liners, and heat shields throughout vehicles. The oil industry used asbestos brake blocks in drilling equipment for similar reasons: the material could handle repeated high-friction, high-heat cycles without failing.
Chemical Plants and Industrial Settings
Factories and chemical plants valued asbestos for a different reason: its resistance to chemical degradation. Gaskets, seals, and linings made with asbestos could withstand prolonged contact with corrosive acids and alkalis without breaking down. This made asbestos essential in chemical production, where pipes and vessels carry substances that would eat through most other materials.
One of the last industrial uses of asbestos in the United States was in diaphragm cells for chlorine production (the chlor-alkali industry). In this process, asbestos membranes separated chemical reactions while enduring constant exposure to corrosive substances. This application persisted long after most other uses had been abandoned, simply because finding a replacement that performed as well in that specific chemical environment proved difficult.
Everyday Consumer Products
Asbestos wasn’t limited to industry and construction. Over 3,000 known products contained the mineral, including many ordinary household items. Appliance components, ironing board covers, table pads, and heat-resistant surfaces all incorporated asbestos fibers. The same properties that made it useful in a boiler room, fire resistance and insulation, made it appealing in any product designed to handle heat in the home.
Why It Took So Long to Stop Using It
The health risks of asbestos were suspected as early as the 1930s and well-documented by the 1960s and 1970s. Inhaled asbestos fibers lodge deep in lung tissue and can cause cancer, including a rare and aggressive form called mesothelioma, often decades after exposure. But the sheer number of applications, combined with the difficulty of finding affordable substitutes that matched asbestos across all its useful properties, meant that production kept climbing through the early 1970s.
After peaking at 794,000 metric tons in 1973, U.S. consumption dropped sharply. By 1975 it had fallen to 552,000 metric tons, and it continued declining through the 1980s and 1990s as regulations tightened and alternatives improved. Still, a full ban took decades longer than many people realize. The EPA finalized a rule in March 2024 that phases out the remaining commercial uses of chrysotile asbestos, the most common type. Chrysotile asbestos diaphragms in chlorine production were banned immediately. Automotive brake linings, oilfield brake blocks, and various gaskets containing asbestos were banned by November 2024. Sheet gaskets used in chemical production have until May 2026 to be phased out.
The long timeline reflects the core reason asbestos was so hard to quit: for many applications, it was the best-performing and cheapest option available, and replacing it required developing entirely new materials that could handle the same extreme conditions.