The selection factor of the Customize Gaskets
When we choose custom washers, first consider the performance of the main including its tip stress, tensile strength, elongation, elongation at failure, pull a permanent deformation, as well as the stress-strain curve and so on. We call it tensile strength. The tensile strength is the maximum tensile stress when the sample is stretched to fracture. It is the stress (modulus) that is reached when the specified elongation is specified. Elongation is the deformation caused by tensile stress of specimen, which is expressed by the percentage of elongation increment and the ratio of the original length. The elongation of the elongation is the elongation of the sample. The permanent deformation is the residual deformation after the tensile fracture of the specimen.
Then, we consider the basic performance of the Customize Gaskets - hardness. Hardness is the ability to express rubber resistance to external pressure. The hardness of rubber is partly related to other properties. For example, the hardness of the glue is higher, relatively speaking, the strength is larger, the elongation rate is small, the wear resistance is better, and the low temperature resistance is worse. High hardness rubber can resist extrusion and damage under high pressure. Therefore, the suitable hardness should be selected according to the working characteristics of the parts.
We know that the Customize Gaskets is often compressed, so we need to consider the compression performance of the Customize Gaskets. Due to the viscoelasticity of the rubber, the compressive stress decreases with time due to the compression of the rubber. After the pressure is removed, the original shape cannot be restored, which is characterized by the compression of permanent deformation. These phenomena are more apparent in high temperature and oil medium. They can affect the sealing performance of seals, which is one of the important properties of sealant.
The most commonly used is brittle temperature, which is the highest temperature that can be broken at low temperature, which can be used to compare the low temperature performance of different glue. However, since the working condition of the self-defined gasket is different from the test conditions, the brittle temperature of the rubber does not indicate the minimum working temperature of the Customize Gaskets, especially in the oil medium. Secondly, the cryogenic temperature retraction, the specimens will be stretched at room temperature to a certain length, and then fixed, quickly cooled to below freezing temperature, release of specimens after reaching temperature balance, and heating at a certain speed, record the specimens retraction were 10%, 30%, 50% and 50% when the temperature, Customize Gaskets respectively by TR10, TR30, TR50 and TR70 said. In the material standard, TR10 is generally used as the index, which is close to the rubber brittleness temperature. Another way to show the low temperature of rubber is to measure its resistance to cold. Usually the sample is compressed at room temperature to a certain deformation, and then in the low temperature freezing, load unloading again let him recover at low temperature, recovery and the ratio of the amount of compression is called compression coefficient of hardy. The greater the coefficient, the better the tolerance of rubber.
Custom washers survival conditions, most of them are living in the system of fuel oil, lubricating oil, Customize Gaskets hydraulic oil and so on, so often in contact with all kinds of oil, natural also need it with oil resistant performance. Rubber in the oil medium, especially under high temperature, can lead to inflation, softening and lower strength and hardness, at the same time in the rubber plasticizer or soluble substances likely to be oil leaching, lead to the weight, volume shrink, cause leakage. Therefore, the oil resistance of rubber is an important property of the rubber material working in the oil medium. The change of weight, volume change and strength, elongation and hardness of the oil are determined by soaking in oil at a certain temperature. It can also be used to indicate the ratio of the strength or elongation to the original strength or elongation of the medium.
The Selection Factor Of The Customize Gaskets
- Jul 20, 2017-