Natural Rubber SIR20 Export Indonesia Supplier
Indonesia as the World's Leading Natural Rubber Exporter
Indonesia is the world's second-largest natural rubber producing country — trailing only Thailand in total annual production volume — with rubber plantations covering approximately 3.4 million hectares across Sumatra, Kalimantan, Java, and Sulawesi. Indonesian natural rubber production consistently exceeds 3 million metric tons per year, the majority of which is exported in the form of Technically Specified Natural Rubber (TSNR), primarily SIR20 grade, which is the dominant internationally traded grade of processed natural rubber.
For B2B buyers of natural rubber — tire manufacturers, industrial rubber goods producers, automotive component suppliers, and rubber compounders — Indonesia offers a combination of scale, competitive FOB pricing, and reliable supply chain infrastructure that makes it one of the most important sourcing origins in the global natural rubber market. Indonesian rubber exports are benchmarked against the Singapore Commodity Exchange (SICOM) RSS3 and TSR20 contracts, providing buyers with a transparent price reference framework for negotiating FOB purchase contracts with Indonesian exporters.
As a trusted supplier spice and agricultural commodity exporter from Indonesia, Global Spice Trade supplies Natural Rubber SIR20 in standard 33.3 kg bales, palletized, with full SICOM-compliant documentation to industrial buyers in Asia, Europe, and the Middle East.
What Is SIR20? Understanding the TSNR Grade System
SIR20 stands for Standard Indonesian Rubber Grade 20 — the most widely traded grade in the Indonesian Technically Specified Natural Rubber (TSNR) classification system. The TSNR system grades natural rubber by measurable technical properties — primarily dirt content, ash content, nitrogen content, volatile matter, and plasticity — rather than by visual appearance, which was the basis of the older Ribbed Smoked Sheet (RSS) grading system.
The "20" in SIR20 refers to the maximum dirt content of 0.20% — the primary differentiator between SIR grades. SIR10 (max 0.10% dirt) and SIR5 (max 0.05% dirt) are cleaner, higher grades that command price premiums but represent a small fraction of Indonesian rubber export volume. SIR20 at max 0.20% dirt is the commercial standard grade that accounts for the majority of Indonesian rubber exports and is the grade specified by most tire and industrial rubber manufacturers for their standard production requirements.
SIR20 Technical Specification Parameters
The complete technical specification for SIR20 is defined by the Indonesian National Standard (SNI 06-1903-2000) and is aligned with international TSNR standards. Each parameter in the specification has a defined maximum or minimum limit and a specified test method that must be used for compliance verification.
Dirt Content (max 0.20%): Measured by filtering a rubber solution through a fine wire mesh and weighing the retained particulate matter. Dirt content reflects the level of bark, soil, and other field contaminants in the raw latex or cup lump raw material. Lower dirt content indicates cleaner raw material handling and processing. SIR20's 0.20% maximum is achievable with standard processing protocols using cup lump or slab rubber raw material.
Ash Content (max 1.00%): Measured by incinerating a rubber sample at high temperature and weighing the mineral residue. Ash content reflects inorganic mineral contamination — primarily soil, sand, and processing chemical residues — in the rubber. High ash content can affect the performance of rubber compounds in demanding applications and is controlled in SIR20 at a maximum of 1.00%.
Nitrogen Content (max 0.60%): Nitrogen content reflects the protein content of the natural rubber — natural rubber from Hevea brasiliensis contains naturally occurring proteins that can affect processing behavior and allergenicity. Maximum 0.60% nitrogen is the SIR20 standard limit, which is achievable with standard coagulation and processing methods.
Volatile Matter (max 1.00%): Measured as the weight loss on heating a rubber sample at 100 degrees Celsius for defined periods. Volatile matter represents residual moisture and other volatile substances in the rubber. SIR20 maximum of 1.00% volatile matter ensures that the rubber has been adequately dried before baling and dispatch.
Plasticity Retention Index — PRI (min 60): PRI measures the resistance of the natural rubber to oxidative degradation — specifically, the ratio of the Wallace Plasticity of the rubber after aging at 140 degrees Celsius for 30 minutes, to the unaged Wallace Plasticity, expressed as a percentage. A higher PRI indicates better heat and oxidation resistance. SIR20 minimum PRI of 60 ensures the rubber retains adequate processing characteristics during compounding and vulcanization.
Wallace Plasticity Po (min 30): Wallace Plasticity Po measures the initial hardness and consistency of the unaged rubber using a Wallace Plastometer. A minimum Po of 30 ensures the rubber has adequate viscosity for processing — too soft a rubber is difficult to process on standard rubber processing equipment, while too hard increases mixing energy requirements.
Primary Applications for SIR20 Natural Rubber
SIR20 is the most widely used grade of natural rubber in global industrial manufacturing, and its applications span the full range of rubber goods production from high-volume commodity products to demanding technical applications.
Tire Manufacturing
Tire manufacturing is the largest single end-use application for natural rubber globally, consuming approximately 70% of total world natural rubber production. Natural rubber's unique combination of high tensile strength, excellent tear resistance, low heat buildup during dynamic deformation, and strong adhesion to steel cord makes it irreplaceable in high-performance tire applications — particularly truck, bus, and off-road tires where the higher demands of load-bearing and dynamic stress require the superior mechanical properties of natural rubber over synthetic alternatives.
Indonesian SIR20 is used by tire manufacturers across Asia — China, India, Japan, South Korea — and Europe as a primary or secondary natural rubber input in their compound formulations. The consistency of SIR20 specification across Indonesian rubber processing facilities allows tire compounders to integrate Indonesian rubber into their established compound formulations without significant adjustment, which is a key operational requirement for large-scale tire manufacturing operations.
Industrial Rubber Goods
The industrial rubber goods sector — encompassing conveyor belts, hoses, seals, gaskets, vibration dampers, rubber bridges, and engineered rubber components for construction and infrastructure — is the second largest application for natural rubber. These applications require natural rubber's high elasticity, resilience, and ability to be compounded to precise hardness and dynamic property specifications. SIR20 is the standard input grade for most industrial rubber goods formulations, providing the baseline technical properties from which the compounder adjusts with processing chemicals, fillers, and vulcanization systems.
Automotive Non-Tire Components
Beyond tires, the automotive sector uses natural rubber extensively in non-tire components — engine mounts, suspension bushings, door seals, weatherstripping, and vibration isolation components. These applications often require more consistent processing properties than tire manufacturing, and some automotive component manufacturers specify SIR10 or SIR5 (cleaner grades) for critical NVH (noise, vibration, harshness) components where dirt content and homogeneity directly affect end-product consistency. However, SIR20 remains the standard grade for the majority of automotive non-tire rubber applications.
Latex Products and General Goods
Natural rubber latex — produced from fresh field latex rather than the coagulated cup lump that forms the primary raw material for SIR20 — serves the glove, foam, and latex thread markets. Dry rubber grades including SIR20 are also used in general rubber goods manufacturing: footwear soles, rubber bands, sporting goods, and agricultural rubber products where the specific compound formulation does not require the highest grade of clean rubber.
Key Export Markets for Indonesian SIR20
Indonesian natural rubber SIR20 is exported to buyers in all major rubber-consuming industrial nations. The geographic distribution of export destinations reflects the location of the world's major tire and industrial rubber goods manufacturing bases.
China
China is Indonesia's largest single rubber export destination, importing millions of metric tons of Indonesian natural rubber annually to supply its massive tire manufacturing industry — the world's largest — and extensive industrial rubber goods sector. Chinese buyers purchase Indonesian SIR20 under both spot contracts benchmarked against SICOM TSR20 futures and forward supply agreements with price fixation provisions. The proximity of Indonesian rubber production regions to Chinese manufacturing centers, combined with Indonesia's position as the world's second-largest rubber producer, makes Indonesian SIR20 the dominant import origin for Chinese buyers.
India
India is a significant buyer of Indonesian natural rubber, importing to supplement domestic production — India is the world's fourth-largest natural rubber producer but consumes more than it produces due to the growth of its domestic tire and automotive industry. Indonesian SIR20 reaches Indian buyers primarily through the port of Chennai and Nhava Sheva (Mumbai), with transit times of 7–12 days from Belawan or Tanjung Priok. Indian buyers are price-sensitive purchasers who closely track the SICOM TSR20 price and negotiate Indonesian FOB prices accordingly.
Europe (Germany, France, Italy, Spain)
European tire manufacturers — Michelin, Continental, Pirelli, and their major suppliers — import Indonesian natural rubber as part of their diversified sourcing strategies across Thai, Malaysian, Indonesian, and Vietnamese origins. European buyers typically specify SICOM-compliant SIR20 with third-party pre-shipment inspection from SGS or Bureau Veritas and require full traceability documentation as part of their supplier qualification requirements. European buyers are increasingly attentive to sustainability certification — EU Deforestation Regulation (EUDR) compliance is becoming a progressively more important requirement for rubber exporters supplying European buyers.
Japan and South Korea
Japanese and South Korean tire and industrial rubber manufacturers are consistent buyers of Indonesian SIR20, with established long-term supply relationships and forward contract structures that provide both parties with pricing and volume stability. Japanese buyers are known for detailed technical specifications and rigorous pre-shipment inspection requirements — SIR20 for Japanese markets typically requires full TSNR testing documentation from SIRIM or equivalent accredited laboratories.
Middle East
Middle Eastern industrial rubber goods manufacturers — serving the construction, oil and gas, and infrastructure sectors — import Indonesian SIR20 for industrial component production. UAE, Saudi Arabia, and Kuwait are the primary Middle Eastern destinations. Transit time from Belawan to Gulf ports via Strait of Malacca is approximately 12–15 days, making Indonesia a logistically efficient source for Middle Eastern buyers relative to South American rubber origins.
Raw Material Sources for SIR20 Production
Indonesian SIR20 is produced from two primary raw material streams — cup lump and field latex coagulum — each with slightly different processing characteristics that affect the final rubber properties.
Cup Lump
Cup lump is the naturally coagulated rubber that forms in the collection cups attached to rubber trees after latex tapping. When the latex in the collection cup is not collected for processing within 24 hours, it begins to naturally coagulate — forming a rubbery mass that is removed from the cup as cup lump. Cup lump is the primary raw material for SIR20 production in Indonesia because it is produced in the largest volumes, can be collected and transported over longer distances without quality deterioration, and processes efficiently in the standard TSNR production line. Cup lump-based SIR20 from established Indonesian processing facilities consistently meets SIR20 technical specification when the processing protocol is correctly managed.
Slab Rubber
Slab rubber is produced by smallholder farmers who add coagulating acid to collected field latex and pour it into slab molds, producing flat slabs of coagulated rubber that are sold to processing factories. Slab rubber typically has higher dirt and impurity content than cup lump because the coagulation process occurs in field conditions without controlled contamination prevention. Processing factories that use slab rubber as a primary raw material require more intensive washing and cleaning operations to achieve SIR20 specification, and slab-based SIR20 may have slightly higher volatility in quality parameters compared to cup lump-based production.
Indonesian Rubber Production Regions
Natural rubber production in Indonesia is concentrated in Sumatra and Kalimantan, which together account for over 80% of total Indonesian rubber production and supply the primary raw material for SIR20 export.
Sumatra
South Sumatra (Palembang region), North Sumatra (Medan region), Riau, and Jambi are the primary rubber-producing provinces in Sumatra. South Sumatra is the single largest rubber-producing province in Indonesia, with extensive smallholder and estate plantation areas and well-developed SIR processing factory infrastructure. North Sumatra's Belawan port is the primary export gateway for Sumatran rubber, offering frequent vessel services to China, India, Japan, South Korea, and Europe. The proximity of North Sumatran rubber processing facilities to Belawan port minimizes inland logistics cost and transit time to port for rubber destined for export.
Kalimantan
West Kalimantan and Central Kalimantan have significant rubber plantation areas, primarily operated by smallholder farmers. Kalimantan rubber is typically processed at factories in the interior and transported to Pontianak or Banjarmasin ports for export. Kalimantan-origin SIR20 meets the same SNI specification as Sumatran SIR20 and is traded at comparable FOB prices — origin within Indonesia does not typically affect the SIR20 FOB price, as the SICOM TSR20 benchmark applies uniformly to Indonesian SIR20 regardless of production province.
Sustainability and EUDR Compliance
The EU Deforestation Regulation (EUDR), which entered into force in 2023 and applies to natural rubber as a listed commodity, requires that rubber products placed on the EU market are produced from land that has not been subject to deforestation or forest degradation after December 31, 2020. This regulation is progressively transforming the documentation and traceability requirements for rubber exports from Indonesia to EU buyers.
Indonesian rubber exporters who supply EU markets are increasingly required to provide geolocation data for the plantation areas from which the rubber raw material was sourced, deforestation-free verification from satellite monitoring services, and supply chain due diligence documentation that demonstrates compliance with the EUDR requirements. Buyers sourcing Indonesian rubber for the European market should confirm EUDR compliance capability with their Indonesian export partner at the time of supplier selection — this is becoming a qualification requirement rather than an optional enhancement for EU market supply.
For full SIR20 product details, container capacity, and documentation scope, visit our natural rubber product page.
Request Natural Rubber SIR20 Specification Sheet & FOB Price
Contact our export team for current FOB price for SIR20 from Sumatra origin, SICOM-compliant specification sheet, and pre-shipment sample. We supply 33.3 kg bales, palletized, with full TSNR CoA from accredited laboratory. MOQ 1 x 20ft container (~20–22 MT).
Request SIR20 Price via WhatsApp →Frequently Asked Questions — Natural Rubber SIR20 Export Indonesia
What does SIR20 stand for and what are its key specification parameters?
SIR20 stands for Standard Indonesian Rubber Grade 20 — the most widely traded TSNR (Technically Specified Natural Rubber) grade from Indonesia. Key parameters: Dirt content max 0.20%, Ash content max 1.00%, Nitrogen content max 0.60%, Volatile matter max 1.00%, Plasticity Retention Index (PRI) min 60, Wallace Plasticity Po min 30, and Dry Rubber Content (DRC) min 99%. These parameters are defined in the Indonesian National Standard SNI 06-1903-2000 and are aligned with international TSNR standards. SIR20 is benchmarked against the SICOM TSR20 futures contract for international pricing reference.
What is the difference between SIR20, SIR10, and SIR5?
The primary difference between SIR grades is dirt content maximum: SIR20 allows max 0.20% dirt, SIR10 allows max 0.10% dirt, and SIR5 allows max 0.05% dirt. Cleaner grades command price premiums above SIR20. All other technical parameters (ash, nitrogen, volatile matter, PRI, Po) are similar or identical across grades. SIR20 accounts for the majority of Indonesian rubber exports and is the standard grade for tire and general industrial applications. SIR10 and SIR5 are specified for demanding technical rubber goods applications where dirt content consistency is critical to product performance.
How is SIR20 packaged and how many bales fit in a 20ft container?
SIR20 is packaged in 33.3 kg bales wrapped in polyethylene film, stacked on wooden pallets typically holding 36 bales per pallet (1,198.8 kg per pallet). A standard 20ft container loaded with palletized SIR20 holds approximately 600 bales — 20 MT net weight. A 40ft container holds approximately 660 bales — 22 MT net weight. Palletized loading enables forklift handling at origin and destination, reducing loading and unloading labor cost and time compared to manual floor-stacking methods used for other commodities.
What is SICOM and how does it relate to Indonesian SIR20 pricing?
SICOM (Singapore Commodity Exchange) is the primary international futures exchange for natural rubber trading in Asia. SICOM's TSR20 futures contract — for Technically Specified Rubber Grade 20 — serves as the global benchmark price reference for SIR20 and equivalent TSNR grades from Thailand, Malaysia, and Indonesia. Indonesian SIR20 FOB prices are typically quoted as SICOM TSR20 price plus or minus a basis differential that reflects Indonesian-specific quality, logistics, and supply-demand factors. Buyers who monitor SICOM TSR20 futures have real-time visibility into the market price benchmark for their Indonesian rubber purchases.
What export documentation is included with SIR20 shipments from Indonesia?
Standard documentation: Certificate of Origin (COO) from KADIN Indonesia, Commercial Invoice and Packing List, Bill of Lading, and TSNR Certificate of Analysis (CoA) covering all six SIR20 technical parameters tested by an accredited laboratory. Phytosanitary Certificate is typically not required for processed rubber bales (rubber is a non-plant material). Optional: third-party pre-shipment inspection from SGS or Bureau Veritas; EUDR compliance documentation for EU market buyers; sustainability certification for buyers with specific ESG sourcing requirements.
What is DRC (Dry Rubber Content) and why does it matter?
DRC (Dry Rubber Content) is the percentage of actual dry rubber in the total bale weight — expressed as a minimum 99% for SIR20. This means at least 99% of the bale weight is actual dry rubber polymer, with the remaining 1% being moisture, volatile matter, and other non-rubber constituents. DRC is important because buyers pay for rubber polymer content — a bale with 97% DRC contains 3% less usable rubber per kilogram of purchased weight than a 99% DRC bale at the same FOB price, effectively increasing the true cost per kilogram of dry rubber by approximately 2%. SIR20's 99% minimum DRC ensures buyers receive consistent usable rubber content per kilogram purchased.
What is EUDR compliance for natural rubber and does Indonesian SIR20 qualify?
The EU Deforestation Regulation (EUDR) requires that natural rubber placed on the EU market comes from land that was not subject to deforestation after December 31, 2020. Indonesian rubber exporters supplying EU buyers must provide geolocation data for source plantation areas, deforestation-free satellite verification, and supply chain due diligence documentation. Indonesian rubber from established estates and certified cooperatives that maintain plantation records and have not undergone deforestation can comply with EUDR requirements. Buyers sourcing for the EU market should confirm EUDR compliance capability with their export partner as a supplier qualification requirement before committing to a supply relationship.
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