Since 2006, Focus on rubber seals

Features of rubber material

by:ORK      2022-11-06
seals are a kind of universal basic element in sealing devices, which play a very important role in the contradiction between leakage and sealing. Solve leaks and seals in man's conquest of nature. It has been an important way to promote technological progress, prevent and reduce environmental pollution. seals are a type of rubber products widely used in sealing technology. Because rubber is a valuable elastic polymer material, it has a wide temperature range, and a small stress in different media will produce a large deformation. This deformation can provide contact pressure, compensate for the leakage gap, and achieve the purpose of sealing . Characteristics of rubber seals materials 1 High elastic modulus, low elastic modulus, large elongation deformation, recoverable deformation, and can maintain elasticity in a wide temperature range (-50 to 150 ℃). 2. The viscoelastic rubber material is affected by temperature and time when it deforms and recovers, and exhibits obvious stress relaxation and creep phenomena. Under the action of vibration or alternating stress, hysteresis loss occurs. 3 Electrical insulating rubber, like plastic, is an electrical insulating material. 4. There are aging phenomena such as metal corrosion, wood decay, and rock weathering. will also experience aging due to changes in environmental conditions, resulting in poor performance and reduced life. 5. It must be vulcanized and must be vulcanized before it can be used, except for thermoplastic elastomers. 6. Other characteristics such as small specific gravity, low hardness, good flexibility, and good air tightness must be added to the compound, which are all valuable properties of rubber. Physical and mechanical properties index 1. Tensile strength, also known as tear strength and tensile strength, refers to the load on a unit section when the test piece is stretched to fracture. The unit is megapascals (MPa). 2 The constant elongation stress, formerly known as the constant elongation strength, refers to the load per unit area when the sample is stretched to a certain length. The unit of measurement is the same as tensile strength. Commonly used are 100%, 300% and 500% tensile stress. It reflects the ability of rubber to resist deformation by external force. 3 Tear strength is the load per unit thickness when a special test piece (with a cut or a right angle) is torn, indicating the tear resistance of the material. 4 Elongation When the test piece is broken, the ratio of the elongation to the original length is called the elongation; it is expressed as a percentage. 5. The percentage of the original length of the unrecoverable part of the gauge length elongation deformation after the permanent deformation specimen is stretched to fracture. After the external force is removed and placed for a certain time (usually 3 minutes), it is expressed in %. 6 Resilience, also known as impact elasticity, refers to the ability of rubber to return to its original state after being impacted, expressed in %. 7 Hardness represents the ability of rubber to resist external force intrusion, which is commonly measured by Shore hardness tester. The hardness of rubber generally ranges from 20 to 100 in Shore A. Company website:
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