A FKM (VITON), matters needing attention when using the import O-ring
Fluororubber has excellent physical and chemical properties. It has high temperature resistance, oil and abrasion resistance, chemical corrosion resistance, and has good anti-aging and ozone resistance capabilities. And it can operate at a working temperature of 200 degrees C or below, allowing short time to run without oil. Even in very bad working conditions, it still has very good wear resistance. Made of DuPont VITON raw material of fluorine rubber O-ring has a more prominent performance. The fluoro rubber is very stable and harmless when the normal working conditions and working temperature are below 220. But if you have a high temperature above 300 DEG, such as torch flame, fluorine rubber will release harmful gases. Inhaling these gases or entering the eye can cause damage to the health of the body. Therefore, the use of fluorine rubber seal must be careful not to exceed the normal use temperature.
Two, FKM (VITON) import O-ring material.
In actual work, the user's consultation is often encountered: what kind of sealing ring material is resistant to high temperature? In this case, we first need to know clearly how high the temperature is, because the word "high temperature" is not quantified, such as 70, 80, 100, 200, etc., which can be regarded as high temperature. If the temperature is 100 DEG C, only considering the NBR Dengqen rubber O-ring from temperature factors can be said; if the temperature is higher than 120 DEG C, Xu Taiwan Meike seal XOK advice: static or food grade, should choose SIL silica gel; if it is dynamic, need to wear chemical resistant the solvent, suggested the use of fluorine rubber (FKM FPM/VITON).
A, fluoroelastomer 23, commonly known as No. 1 glue, is a copolymer of vinylidene fluoride and three fluorochloroethylene.
B, fluoro rubber 26, commonly known as No. 2 glue, DuPont brand VITON A, for vinylidene fluoride and six fluorine propylene copolymer, comprehensive performance is better than No. 1 glue;
C, fluorine rubber 246, commonly known as No. 3 glue, DuPont VITON grade B, as vinylidene fluoride, tetrafluoroethylene, hexafluoropropylene copolymer of six three yuan, 26 higher than the content of fluorine rubber, solvent resistant performance is good;
D, partial fluoroether rubber, DuPont VITON grade GLT, as vinylidene fluoride, tetrafluoroethylene, Perfluoromethyl vinyl ether, vulcanization point four monomers, excellent low temperature performance;
E, perfluoroether rubber, DuPont brand KALREZ, excellent at low temperature, high content of fluorine and excellent solvent resistance.
F and fluorosilicone rubber have excellent performance at low temperature and have a certain solvent resistance.
Three, FKM (VITON) import O-ring can work in severe working conditions
The sealing ring of fluoro rubber is very suitable for use in the industrial and mining environment with high temperature resistance, chemical and corrosiveness. Fluorine rubber O-ring will usually be produced according to customer requirements into a black, brown and green. The limit temperature is -40~240 C and can reach a high temperature of 250 degrees centigrade, depending on the structure of the polymer and the system of crosslinking. The chemical and corrosive resistance mainly depends on the content of fluorine, and the higher the content of fluorine, the better the chemical stability and corrosion resistance of FKM/VITON. At present, Taiwan Asahi Meike seal XOK fluorine rubber mainly uses Daikin and American DuPont materials, DuPont fluorine rubber sealing ring in all aspects are very good.
When selecting seal material, besides considering the temperature range of the seal, we should also consider the properties of the liquid or gas that it is in contact with, the expansion or contraction of the seal ring, and the factors such as chemical stability and working pressure. If the working pressure exceeds the normal pressure of 75 degrees, the hardness of 80 degrees, 90 degrees or the combination of the retaining ring should be considered. Usually, the shape of the O ring ring has three kinds of ring, slanting and spiral shape. At present, the ring ring is widely used and excellent.