seal is a kind of common sealing device, is widely applied in different working conditions and industry, is very good to help people solve the problem of the leak and seal, the rubber seal rubber how should choose?
Dongguan rubber seals
manufacturer to make a brief introduction: -
When we choose rubber seals, 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 are collectively referred to as tensile strength.
The tensile strength is the so-called sample tension to the maximum tensile stress.
Stretch stress (
Is stress in specified elongation at (
Elongation is caused by the tensile stress and deformation of sample, with the percentage of elongation increases with the ratio of the original length of said.
Elongation at failure is when the specimen tensile elongation.
Pull a permanent deformation is sample after tensile fracture scale distance part of the residual deformation.
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Then, we consider the basic properties of the rubber seals - hardness.
So-called said rubber hardness is invading the ability to resist outside pressure.
The hardness of the rubber and other performance related to a certain extent.
For example, the high hardness of the rubber seals, relatively speaking, the strength is big, small elongation, good wear resistance, and low temperature resistance is poor.
High hardness rubber can resistance to high pressure extrusion.
So should work according to the parts characteristics to choose suitable hardness.
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We know the status of the rubber seals are frequently under compression, then we consider the performance of the rubber seal compression.
Due to the viscoelastic property of rubber, rubber after compression, compression stress decreases with time, show the compress stress relaxation;
Remove the pressure, can not restore the original appearance, show the compression permanent deformation.
In the high temperature and oil medium, the phenomenon is more significant.
They're affects the sealing performance of seal, seal with one of the important performance of the rubber.
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We are the most commonly used is brittle temperature, it is to point to sample in low temperature by a certain impact rupture, the highest temperature can be used to compare different low temperature performance of the rubber.
But due to the working state of the rubber parts with different test conditions, brittleness temperature of the rubber rubber pieces minimum working temperature, 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 70% when the temperature, respectively by TR10, TR30, TR50 and TR70 said.
Material standard in general with TR10 as indicators, and rubber to brittleness temperature.
Said the other method is the low temperature properties of the rubber its cold resistant coefficient.
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, rubber cold resistance is better.
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Bad living conditions of the rubber seals, most of them are living in the system of fuel oil, lubricating oil, hydraulic oil and so on, so often in contact with all kinds of oil, natural also need it with oil resistant performance.
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.
So the oil resistance of rubber is working in the oil medium important performance of the rubber.
Is generally under a certain temperature in oil soak some time after the determination of the weight change, volume change and strength, elongation and hardness changes.
Sometimes expressed by oil resistant coefficient, namely after soaking in a medium strength and elongation and strength of the original or the ratio of elongation.
Above, it is simply introduce the main performance of rubber seal should be considered.
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