A Complete Guide to ISO 37 Testing SolutionNovember 03 , 2025
A Complete Guide to ISO 37 Testing Solution
This standard specifies methods for determining the tensile stress-strain properties of vulcanized rubber and thermoplastic rubber. Measurable properties include tensile strength, elongation at break, stress at a given elongation, elongation at a given stress, yield stress, and yield elongation. However, the measurement of yield stress and yield elongation is applicable only to certain thermoplastic rubbers and specific compounds.
Scope and Purpose of the Standard
ISO 37 applies to various vulcanized rubbers (e.g., natural rubber, synthetic rubber) and thermoplastic rubbers (e.g., TPE, TPU). It is widely used for evaluating the performance of products such as automotive components, seals, tires, and conveyor belts. The standard aims to reveal the mechanical behavior of materials under stress through tensile testing, ensuring they meet the requirements of specific application scenarios.
Test Principle and Key Requirements
ISO 37 employs the Constant Rate of Extension (CRE) method. By stretching the specimen to failure, it records changes in force and displacement to calculate key performance indicators. Core requirements include:
Specimen Types: Multiple standard specimen shapes are provided, such as dumbbell-shaped (Types 1, 2, 3, 4) and ring specimens. Dumbbell-shaped specimens are most commonly used, with dimensions precise to the millimeter level.
Extension Speed: The default speed is 500 mm/min (±50 mm/min), but it can be adjusted based on material properties (e.g., reduced to 200 mm/min for stiffer materials).
Gripping Devices: Grips must prevent specimen slippage, ensure uniform clamping force, and avoid premature tearing.
Test Environment: Temperature 23±2°C, relative humidity 50±10%. Adjustments per ISO 23529 permitted under special conditions.
Measurement Parameters:
Tensile Strength: Maximum stress at specimen fracture (unit: MPa).
Elongation at Break: Percentage increase in length relative to initial length at fracture.
Stress at Specified Elongation: Stress values at elongations such as 100% or 300%.
Tensile Yield Point (if applicable): Yield stress for certain thermoplastic rubbers.
Testing Equipment
Universal Testing Machine is designed for conducting tensile, compression, bending, shearing, bonding strength, peeling, tearing and other tests for shoes ,rubber, plastic, leather, metal, nylon line, fabric, paper, aviation, packaging, construction, petrifaction, electrician, vehicle and other materials. It is a basic equipment of quality control, receiving inspection, physical test, mechanics research, material development.
ISO 22650, ISO 19958, ISO 3377-1, ISO 3377-2, ISO 11644, ISO 20866, ISO 20867, ISO19957, ISO20874, ISO20344-5.2.4, ISO 20345-5.3.1.2, ISO17698, ISO20875, ISO22777, ISO22776, ISO22654, ISO20863, ISO20876, ISO17695, ISO17697, ISO34-1, ISO36, ISO37, ISO 17708, ISO 17696, ISO17706, ISO 22650
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