# Natural rubber: Characteristics

Why synthetics cannot match it in heavy tyres

Source page: https://www.materialinsights.org/commodities/rubber/characteristics/

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** | 14.83 Mt of natural rubber (2024) | Output nearly tripled from 5.23 Mt in 1990 but has grown slowly since 14.24 Mt in 2020. India made 8.75 lakh t in 2024-25. | FAOSTAT 2024; Rubber Board via Lok Sabha, Aug 2025 |
| **Inventory and stock levels** | not published as a world figure | Visible stocks sit in Shanghai Futures Exchange warehouses and Chinese bonded zones; volumes were not in the sources used. China holds state reserves. India has no buffer stock. The standing stock is the tree population: India had about 2 lakh ha of untapped plantations in 2025. | content_v2 rubber stocks; Lok Sabha Unstarred Q 2649, Aug 2025 |
| **Capacity utilisation** | India: about 2 lakh ha untapped against 3.8 lakh ha harvested | Tapping intensity is the real utilisation rate: farmers stop tapping when prices are low or rains heavy. In India about 2 lakh ha, half in Kerala, were left untapped. A world tapping rate is not published. | Lok Sabha Unstarred Q 2649, Aug 2025; FAOSTAT 2024 |
| **Geographic and producer concentration** | Thailand 32.3%, top-3 (Thailand, Indonesia, Côte d'Ivoire) 58.9%, HHI 1,597 | Moderately concentrated. Côte d'Ivoire has become the third-largest producer. Processing is led by Sri Trang, Halcyon Agri and Hainan Rubber; tyre makers (Michelin, Bridgestone, Goodyear) dominate demand. A top-5 company share is not published. | FAOSTAT 2024 |
| **Supply elasticity** | short run: medium through tapping frequency; long run: at least 7 years for new trees | Output responds within months as farmers tap more or less. New planting takes at least seven years to raise output, so the 2011 price peak led to a glut years later. | Rubber World, Jan 2025; content_v2 rubber supercycle |
| **Project pipeline and CapEx** | India North East project: 150,915 ha planted of a 200,000 ha target; West African expansion | India's tyre-industry-funded North East plantation project had planted 150,915 ha by August 2025. Côte d'Ivoire supplies 17.7% of export value and keeps expanding. Per-hectare CapEx was not found. | Lok Sabha, Aug 2025; UN Comtrade 2024 |
| **Logistics and export flows** | about 88% of output exported (2018); world exports worth $13.9 billion (2024) | TSR bales and RSS move in containers from Laem Chabang, Songkhla, Belawan and Abidjan to China, the US, Japan and India. The Strait of Malacca is the main chokepoint for Asian supply. | Radetzki & Warell 2021; UN Comtrade 2024 |

#### Material characteristics Agricultural / soft commodity

Natural rubber is almost pure cis-1,4-polyisoprene. Its high strength, elasticity, tear resistance and low heat build-up under repeated flexing make it essential for truck, aircraft and radial tyres, where synthetics cannot fully replace it. Grades are set by technical specifications for dirt, ash, volatile matter and plasticity, which predict processing behaviour.

| Property | Value / specification | Why it matters | Source |
|---|---|---|---|
| **Dirt content (TSR20)** | 0.16% maximum | Dirt causes weak points and failures in tyres | ISO 2000 / SMR and STR specifications (indicative) |
| **Ash, volatile matter and nitrogen (TSR20)** | ash 1.0%, volatile matter 0.8%, nitrogen 0.6% maximum | Control consistency and curing behaviour in compounding | ISO 2000 (indicative) |
| **Plasticity (Po) and PRI** | Po at least 30; plasticity retention index at least 40 | Show resistance to oxidation and how the rubber will mix and process | ISO 2000 (indicative) |
| **Tensile strength and elongation** | gum vulcanisate roughly 25-30 MPa and about 700% elongation at break | Strain-crystallisation gives strength that most synthetics lack | polymer literature (indicative) |
| **Low heat build-up and low glass transition** | Tg about -70 C | Keeps heavy truck and aircraft tyres cool and flexible | polymer literature (indicative) |
| **Latex concentrate** | dry rubber content at least 60% | Specification for gloves, condoms and foam | ISO 2004 (indicative) |

## Other sections

- [Summary](https://www.materialinsights.org/commodities/rubber/index.md)
- [Overview](https://www.materialinsights.org/commodities/rubber/overview/index.md)
- [Correlation](https://www.materialinsights.org/commodities/rubber/correlation/index.md)
- [Extraction](https://www.materialinsights.org/commodities/rubber/extraction/index.md)
- [Production](https://www.materialinsights.org/commodities/rubber/production/index.md)
- [Stocks](https://www.materialinsights.org/commodities/rubber/stocks/index.md)
- [Cycles](https://www.materialinsights.org/commodities/rubber/cycles/index.md)
- [Trading](https://www.materialinsights.org/commodities/rubber/trading/index.md)
- [Movement](https://www.materialinsights.org/commodities/rubber/movement/index.md)
- [Criticality](https://www.materialinsights.org/commodities/rubber/criticality/index.md)
- [Emissions](https://www.materialinsights.org/commodities/rubber/emissions/index.md)
- [Relationships](https://www.materialinsights.org/commodities/rubber/links/index.md)