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Performance characteristics of O-ring fluorine adhesive
Performance characteristics of fluorine rubber O-ring
The fluorine rubber O-ring has good high-temperature resistance among commonly used rubber materials, with a general instantaneous high-temperature resistance of up to 250 degrees Celsius and a low-temperature resistance of up to -40 degrees Celsius. However, the long-term temperature resistance needs to decrease, with a long-term high-temperature resistance of around 200 degrees Celsius and a long-term low-temperature resistance of around -20 degrees Celsius. ZOE company’s fluorine rubber O-ring can still maintain good elasticity even when it is resistant to high temperatures of 250 degrees, and its resistance to acid and alkali corrosion will not decrease. Its elongation at break can be maintained at around 100% when it is resistant to the highest temperature, and of course, it can maintain good wear and oil resistance. In short, the good performance of fluorine rubber O-ring will not decrease with the increase of temperature resistance.
The perfluorinated rubber O-ring is the material with the best high-temperature resistance among rubber O-rings, with a temperature resistance of -20 to 300 degrees Celsius, and can even reach 327 degrees Celsius in some cases. Within the temperature range of 25 to 250 degrees Celsius, the linear expansion coefficient of perfluorinated rubber is 3.2 * 10-4 ℃ -1. After being converted into volume thermal expansion, perfluorinated rubber is generally 75% larger than fluororubber. When applied in high-temperature environments, this expansion factor must be considered, otherwise it will lead to premature failure of the sealing element. The elongation at break of perfluorinated rubber is between 120% -170%. At high temperatures of 300 degrees, the perfluorinated O-ring produced by Xinhuaxu Company can still achieve excellent elongation at break, and the elongation at break will not decrease with the increase of temperature. Of course, its oil resistance, wear resistance, and acid alkali corrosion resistance will not decrease.
Silicone rubber O-rings and fluorine rubber O-rings are commonly used and can withstand high temperatures. The so-called high-temperature O-ring requires understanding the normal temperature at which the O-ring is used, and selecting the appropriate O-ring material based on the specific temperature range. The maximum temperature of fluorine rubber O-ring is 240 degrees, and it is recommended to use it for a long time at a temperature below 220 degrees. It can be said that fluorine rubber O-ring is one of the best rubber products. The maximum temperature of silicone rubber O-ring is 250 degrees, and it is recommended to use it for a long time at a temperature below 230 degrees. If it is mainly used for sealing the cooling channel of the die-casting mold, both silicone rubber O-rings or fluororubber O-rings can be used. If oil resistance is not required, EPDM O-rings can be used. If it is simply resistant to natural gas, most rubber O-rings can be used.
According to the properties and characteristics of the medium oil, such as polar oil, non polar oil, temperature conditions of the oil, etc. To determine the level of oil resistance performance. Different levels of O-rings require different main rubber materials to be selected. For example, if the medium oil is used at room temperature, nitrile rubber can guarantee it; If used under high temperature conditions, silicone rubber or fluororubber should be chosen.