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Indicators for characterizing the physical and mechanical properties of rubber:
1. Tensile strength: also known as tensile strength or tensile strength, refers to the load that a specimen can withstand per unit section when stretched to fracture, measured in megapascals (MPa), previously measured in kilograms of force per square centimeter (kgf/cm2).
2. Tensile stress: formerly known as tensile strength, it refers to the load per unit area that a specimen can withstand when stretched to a certain length. The unit of measurement is the same as the tensile strength. Commonly used are 100%, 300%, and 500% tensile stress. It reflects the ability of rubber to resist external deformation.
3. Tear strength: The load per unit thickness that a special specimen (with a cut or right angled shape) can withstand when torn, indicating the material's tear resistance, measured in kN/m.
4. Elongation: When the test piece is pulled apart, the ratio of the elongation part to the original length is called elongation; Expressed as a percentage.
5. Permanent deformation: The percentage of the unrecoverable part of the gauge length elongation deformation after the specimen is stretched to fracture. After releasing the external force and leaving it for a certain period of time (usually 3 minutes), expressed as a percentage.
6. Resilience: also known as impact elasticity, refers to the ability of rubber to recover its original state after being impacted, expressed in%.
7. Hardness: Refers to the ability of rubber to resist external pressure, commonly measured by a Shore hardness tester. The hardness range of rubber is generally between 20 and 100, measured in Shore A.