THE PRODUCTION PROCESS OF NATURAL RUBBER SVR 10 AND SVR 20

Natural Rubber SVR 10 is a mid-grade block rubber widely used in tire manufacturing and industrial applications that require durability, flexibility, and cost-efficient performance. At Ngoc Chau Natural Rubber, SVR 10 is produced through a fully standardized, process-first workflow that transforms variable field coagulum into a consistent, low-dirt rubber grade. By combining controlled maturation, precision mechanical processing, multi-stage washing, and hot-air drying, Ngoc Chau ensures stable processing behavior, reliable Mooney viscosity, and uniform bale quality. This approach allows manufacturers to run long production cycles with predictable compounding results, making Ngoc Chau’s natural rubber SVR 10 a dependable raw material for tires, conveyor belts, hoses, footwear, and general-purpose industrial rubber goods.

What Is Natural Rubber SVR 10?

Natural Rubber SVR 10 (Standard Vietnamese Rubber 10) is a mid-grade block rubber produced in Vietnam from coagulated natural latex, including cup lumps and tree lace collected from rubber plantations. These secondary latex materials are mechanically processed, cleaned, and standardized into uniform rubber blocks that deliver stable performance at a controlled cost level.

SVR 10 is valued for its good elasticity, abrasion resistance, and reliable processability, making it suitable for a wide range of industrial and tire-related applications. While it does not target ultra-low impurity levels, SVR 10 offers a practical balance between quality and affordability, allowing manufacturers to maintain consistent production without excessive raw material costs.

Because of its predictable behavior during mixing and compounding, natural rubber SVR 10 is commonly used in tire treads and carcasses, conveyor belts, hoses, footwear soles, and other general-purpose rubber goods. It is also frequently blended with higher-grade rubbers to meet specific mechanical or cost-performance requirements, reinforcing its role as a versatile and widely traded natural rubber grade in global supply chains.

Step-by-Step Production Process of Natural Rubber SVR 10

Natural Rubber SVR 10 is produced through a standardized block rubber workflow designed to convert variable field coagulum into clean, consistent rubber bales. Below is the full step-by-step SVR 10 production process used across Vietnam’s industrial standard, focusing on mechanical cleaning, uniform crumb formation, and controlled hot-air drying.

Step 1 – Raw Material Collection & Pre-Cleaning (Field Coagulum)

SVR 10 begins with field coagulum materials such as cuplumps, tree lace, and mixed coagulum collected from rubber plantations. Because these sources may contain bark specks, soil, or foreign matter, they are sorted and pre-cleaned immediately to remove visible contaminants and reduce variability before processing.

Step 2 – Maturation (Stabilizing the Coagulum)

After pre-cleaning, the material is stored under covered conditions for several weeks. This maturation stage helps stabilize the coagulum and improves processing consistency. Proper maturation supports:

• more uniform mechanical breakdown in milling,

• better moisture equalization,

• improved batch-to-batch stability during downstream mixing.

Step 3 – Slab Cutting & Milling (Size Reduction and Blending)

Matured coagulum is blended and fed into slab cutters and hammer mills to break it into smaller, more uniform pieces. This stage is essential because consistent particle size helps:

• improve washing efficiency,

• reduce trapped dirt,

• prepare the rubber for controlled shredding into crumb form.

Step 4 – Shredding & Multi-Stage Washing (Dirt Reduction)

The rubber is shredded into small crumb particles, then washed in tanks through multiple stages to remove impurities such as sand, wood fragments, and residual organic contaminants. This washing step is a key driver of SVR 10’s controlled dirt content and cleaner appearance compared to lower grades.

Step 5 – Hot-Air Drying (110–120°C) for Moisture and Volatile Control

Washed rubber crumbs are dried in hot-air chambers at approximately 110–120°C. Drying is carefully controlled to achieve stable moisture levels and reduce volatile matter—two critical factors for storage stability and predictable processing behavior. Over- or under-drying can lead to inconsistent plasticity, variation in Mooney viscosity, or handling issues in factories.

Step 6 – Baling, Packing & Export Preparation (Standard Bale Weights)

Once dried, the rubber is pressed into standardized bales, commonly:

• 33.33 kg/bale, or

• 35 kg/bale

Bales are wrapped, labeled, and palletized (as required) for shipment. Final lots are prepared to meet ISO/TCVN standards, and export shipments are typically supported with COA, TDS, and MSDS for buyer QA, audits, and customs clearance.

Together, these controlled processing steps allow SVR 10 to deliver consistent performance despite the variability of its raw material inputs.

Quality Specifications of Natural Rubber SVR 10

Natural Rubber SVR 10 is defined not only by its production process but also by a standardized set of physical and chemical parameters that ensure consistent performance in industrial applications. In Vietnam, SVR 10 quality is evaluated under TCVN 3769:2016, harmonized with ISO 2000:2014, using laboratory-based testing rather than visual grading.

These specifications focus on impurity control, processing stability, and resistance to thermal and oxidative aging, ensuring reliable performance during mixing, compounding, and vulcanization.

Standard Quality Requirements for SVR 10

According to TCVN 3769:2016 (based on ISO 2000:2014), the physical and chemical properties of natural rubber SVR 10 are specified as follows:

• Dirt Content (through sieve): ≤ 0.08% by weight
  Controls contamination levels and helps reduce compound defects.

• Ash Content: ≤ 0.60% by weight
  Limits inorganic residues that may interfere with vulcanization.

• Nitrogen Content: ≤ 0.60% by weight
  Indicates controlled levels of non-rubber components affecting elasticity and aging behavior.

• Volatile Matter: ≤ 0.80% by weight
  Confirms effective drying and supports storage stability.

• Initial Plasticity (P₀): ≥ 30
  Ensures sufficient workability for efficient mechanical processing.

• Plasticity Retention Index (PRI): ≥ 50
  Demonstrates resistance to heat and oxidative degradation during service life.

Together, these standardized limits ensure that natural rubber SVR 10 delivers a balanced combination of durability, processability, and cost efficiency, making it suitable for tire components, conveyor belts, hoses, footwear, and other general-purpose industrial rubber products.

SVR 10 vs SVR 20: Why SVR 10 Exists

SVR 10 is a mid-grade natural rubber designed to balance cost and performance. It offers better purity and more stable mechanical properties than SVR 20, while remaining more affordable than premium grades such as SVR 3L. This makes SVR 10 suitable for applications that require dependable elasticity and abrasion resistance without the cost of high-purity rubber.

Key Differences Between SVR 10 and SVR 20

• Raw material: Both grades use coagulated or mixed latex, but SVR 10 typically relies on cleaner, pre-processed materials with tighter production control than SVR 20.

• Purity: SVR 10 has lower dirt content and higher consistency compared to SVR 20.

• Mechanical properties: SVR 10 provides better tensile strength, tear resistance, and elasticity, supporting more stable industrial performance.

• Cost: SVR 10 sits between premium and low-grade rubber, while SVR 20 focuses primarily on minimum cost.

Why SVR 10 Exists

SVR 10 exists to bridge the gap between low-cost rubber and high-purity grades. It delivers cost-effective performance for industries such as tires, footwear, and general industrial rubber, where materials are often blended to optimize both performance and price. Compared to SVR 20, SVR 10 offers a meaningful step up in quality, while avoiding the higher cost of premium natural rubber grades.

FAQs – Natural Rubber SVR 10

1. What is Natural Rubber SVR 10 used for?

SVR 10 is a mid-grade natural rubber used in tires, conveyor belts, hoses, footwear, and general industrial rubber products, offering a balance between performance and cost.

2. What ensures consistent quality in SVR 10?

Consistent quality comes from controlled maturation, thorough washing, and hot-air drying, which stabilize Mooney viscosity and reduce impurities.

3. How is SVR 10 different from SVR 20?

SVR 10 is cleaner and more stable than SVR 20, with better processing behavior while remaining cost-effective.

4. What are the key technical specifications of SVR 10?

Typical specs include dirt ≤ 0.08%, volatile matter ≤ 0.80%, P₀ ≥ 30, and PRI ≥ 50, per TCVN/ISO standards.

5. Why choose SVR 10 from Ngoc Chau Natural Rubber?

Ngoc Chau offers stable quality, export-ready packaging, and full technical documentation, supporting reliable long-term production.

Conclusion

Natural Rubber SVR 10 delivers a reliable balance between performance consistency and cost efficiency for industrial rubber manufacturing. Through a process-driven production workflow, Ngoc Chau Natural Rubber ensures stable processing behavior, controlled impurity levels, and uniform bale quality across export lots.

For manufacturers and traders seeking dependable SVR 10 backed by standardized quality control and export-ready documentation, Ngoc Chau Natural Rubber is a trusted long-term supply partner.