Elastomer material TPE/TPR physical property test item and method
Hardness refers to the ability of a material to partially resist the intrusion of a hard object into its surface. Because the relative softness or hardness of a material is often the first consideration in the selection of materials, and hardness is also related to other important design characteristics, such as tensile modulus and flexural modulus. Therefore, the purpose of testing the hardness is to first determine the hardness specification of the thermoplastic elastomer for customers to choose.
The most commonly used instrument for measuring rubber hardness is called the Shore hardness tester. TPE material testing generally only uses ShoreA and ShoreD hardness testers.
2. Compression deformation
Compression deformation refers to the test of the amount of permanent deformation of a rubber or elastomeric material under compression (applying a load to a specific amount of action, say 25%) and at different temperatures. All polymer materials undergo corresponding creep behavior under certain load conditions, and the compression deformation test is a rough measurement of the creep behavior of the material under compressive loading.
The tools necessary to test compression set primarily require an oven and compression unit, including compression plates, limiters, and fasteners.
Normally the Shore10-80A compression ratio is 25%, the Shore80-89A compression ratio is 15%, and the Shore90-95A compression ratio is 10%.
3. Stretching permanent deformation
Tensile permanent deformation refers to the residual deformation of a specimen after its elongation under a certain tensile force, expressed as a percentage of the original length. All elastomeric materials undergo a corresponding application relaxation under certain stresses, and the tensile permanent deformation test is a rough measurement of the stress relaxation behavior of the material under tensile stress.
4. Tensile strength
Tensile strength is the maximum tensile stress generated during the stretching of the specimen until it is pulled. It is an accurate measure of the tensile strength of the elastomer material.
5. Tear strength
A mechanical tearing process occurs at a certain point of the rubber material under the action of high stress concentration, which will cause the material to break, defect or local deformation, and tear Strength is a quantitative representation of the maximum destructive force required during this fracture process.
6. Oil resistance
The oil resistance test is mainly to measure the change of various performance indexes (volume, hardness, tensile strength, etc.) of materials in different standard reference oils, mainly to guide the materials in Normal use in the field of fluid oil contact.
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