40-50s-nr

Updated: 2026-08-19

Overview

40-50S-NR is a grade of natural rubber derived from the latex of the Hevea brasiliensis tree. It is classified under Technically Specified Rubber (TSR) and is known for its standardized quality parameters, making it suitable for industrial applications. The '40-50S' designation refers to its viscosity and impurity levels, ensuring consistent performance in manufacturing processes. Natural rubber like 40-50S-NR is prized for its superior mechanical properties, including high elasticity and resilience. It is a renewable resource, and its production is concentrated in tropical regions such as Southeast Asia. The rubber is processed into blocks or bales for ease of transportation and handling in B2B transactions.

Physical and Chemical Properties

40-50S-NR exhibits a density of approximately 0.92-0.94 g/cm³ and is insoluble in water but soluble in many organic solvents. Its molecular structure consists of long polyisoprene chains, which contribute to its elasticity and strength. The rubber is thermally unstable and decomposes before reaching a melting point, requiring careful processing to avoid degradation. Key properties include high tensile strength (up to 30 MPa) and excellent abrasion resistance, making it ideal for dynamic applications like tire treads. The rubber also has good adhesion properties, which are beneficial in adhesive formulations. Its resistance to cutting and tearing is superior to synthetic rubbers in many cases.

Main Applications

The primary use of 40-50S-NR is in the tire industry, where it is blended with synthetic rubbers to enhance performance. It is also widely used in conveyor belts, industrial hoses, and vibration dampers due to its durability and flexibility. Footwear manufacturers utilize this rubber for soles and other components that require high wear resistance. In addition to industrial applications, 40-50S-NR is used in medical devices, adhesives, and sealants. Its biocompatibility and elasticity make it suitable for gloves and other disposable medical products. The rubber's versatility ensures demand across multiple sectors, including automotive, construction, and consumer goods.

Safety and Storage

40-50S-NR is generally safe to handle but may cause allergic reactions in sensitive individuals. Dust generated during processing should be minimized to prevent respiratory irritation. The rubber is combustible and should be stored away from open flames or high-temperature environments. Proper storage conditions include a cool, dry place with adequate ventilation. Exposure to direct sunlight or ozone can degrade the rubber over time, reducing its performance. Suppliers often recommend using anti-oxidants or stabilizers in formulations to extend shelf life and maintain properties during storage.

B2B Procurement Guide

When procuring 40-50S-NR, buyers should prioritize suppliers with certifications such as ISO or SMR (Standard Malaysian Rubber) to ensure quality consistency. Bulk purchases typically offer cost advantages, but buyers should verify storage conditions and shelf life before committing to large orders. Key procurement considerations include testing for viscosity, dirt content, and ash levels to meet specific application requirements. Negotiating long-term contracts with reliable suppliers can stabilize pricing and ensure a steady supply chain. Buyers should also stay informed about market trends, as natural rubber prices fluctuate based on geopolitical and environmental factors.