Asbestos: Characteristics
Strength, flexibility and fireproofing: why builders loved it
What this tab covers The supply and physical characteristics of the commodity. Supply: current production, inventories and stocks, capacity utilisation, geographic and producer concentration, how fast supply responds to price, the project pipeline and capital spending, and logistics and export flows. Material: the physical and chemical properties that set its grade, price and end uses (for example purity and conductivity for metals, API gravity, sulfur and energy content for fuels, moisture, protein and fibre quality for crops).Supply volume characteristics
| Characteristic | Figure | What it means | Source |
|---|---|---|---|
| Current production volume | about 960,000 t (2025e, USGS); 1.21 Mt (2024, World Mining Data) | Russia produced about 310,000 t, Kazakhstan and China 250,000 t each and Brazil 150,000 t. World use was about 930,000 t in 2025, down nearly 55% from about 2 Mt in 2000. | USGS MCS 2026, Asbestos; World Mining Data 2026 |
| Inventory and stock levels | not published | No exchange or government stocks. US chloralkali plants used only stockpiled fibre in 2025 (about 50 t), as imports were banned in May 2024. | USGS MCS 2026 |
| Capacity utilisation | not published | Kostanay Minerals in Kazakhstan produces more than 250,000 t a year; Brazil's only producer sold 166,890 t for export in 2024. Output is set by shrinking demand, not by capacity. | Forbes Kazakhstan 2022; USGS MCS 2026 |
| Geographic and producer concentration | Russia 32%; top-3 (Russia, Kazakhstan, China) 84%; HHI about 2,600 (USGS 2025) or 3,422 (World Mining Data 2024) | Only four countries mine it. Kazakhstan and Brazil each have a single producer; Uralasbest dominates Russian output. World Mining Data gives Russia 51%. | USGS MCS 2026 (HHI computed); World Mining Data 2026 |
| Supply elasticity | supply is shrinking by policy, not responding to price | Reserves are 150 Mt, about 156 years of output, so geology does not bind. Bans and lawsuits do: Brazil's Supreme Court ruled asbestos unconstitutional, and Goias set a 5-year deadline to end mining once a closure plan is agreed. | USGS MCS 2026 |
| Project pipeline and CapEx | none; capacity is expected to fall | No new mines are planned. Zimbabwe may reprocess old tailings. US use will end by 2036 for chloralkali and 2037 for imported gaskets. | USGS MCS 2026 |
| Logistics and export flows | most output is exported to Asian asbestos-cement plants | Kostanay exports about 95% of its output to Uzbekistan, India, Tajikistan, Sri Lanka, China and Vietnam. Russia supplied 63% of India's 308,506 t of imports in 2020-21. Fibre moves in bags by rail and sea. | Forbes Kazakhstan 2022; IBM 2022 |
Material characteristics Industrial mineral
Commercial asbestos today is chrysotile, a fibrous serpentine. Its strength, flexibility and heat resistance made it a cheap reinforcing fibre for cement sheets and pipes. Value is set mainly by fibre length: long fibres for textiles and friction were the premium grades, short fibres go into cement. All forms are proven human carcinogens, which now governs every commercial decision.
| Property | Value / specification | Why it matters | Source |
|---|---|---|---|
| Fibre length grade | graded by length groups; US tariff lines separate crudes and milled fibre groups 3, 4 and 5 | Longer fibres are worth more; most cement uses shorter grades | USGS MCS 2026 (tariff schedule); Quebec Standard grading |
| Chemistry | Mg3Si2O5(OH)4, about 40% MgO, 40% SiO2, 13% water (indicative) | Loses structural water at about 600-700 C, which limits top-end heat use (indicative) | mineralogy reference, indicative |
| Tensile strength | very high for a mineral fibre (indicative) | Lets 8-10% fibre reinforce cement sheets and pipes cheaply | IBM (dosage) |
| Dosage in asbestos-cement | about 8-10% chrysotile, 45% cement and 30-35% fly ash by weight | Sets fibre demand per tonne of sheet | IBM Indian Minerals Yearbook |
| Health classification | all asbestos fibre types are Group 1 human carcinogens | Drives national bans, liability and handling rules, including the 2024 US ban | IARC; USGS MCS 2026 |