Fluororubber is a kind of synthetic rubber containing fluorine atoms. Fluororubber has excellent properties such as high temperature resistance, oil resistance and corrosion resistance of many kinds of chemicals.

The high temperature resistance of fluoroelastomer is the same as that of silicone rubber. Fluororubber can be used at 250℃ for a long time and 300℃ for a short time. The high temperature resistance of fluororubber is better than that of fluororubber 26-41. Type 23-11 fluororubber can be used at 200℃ for a long time and 250℃ for a short time.

Type 23 fluororubber has better electrical properties and lower hygroscopicity than other rubber, so it can be used as better electrical insulation material. Type 26 fluoro rubber can be used at low frequency and low pressure. Due to the advantages of high temperature resistance, oil resistance, high vacuum resistance, acid and alkali resistance, and various chemicals resistance, fluororubber has been widely used in modern aviation, missile, navigation, rocket, space navigation, ship, atomic energy and other cutting-edge technologies, as well as automotive, shipbuilding, chemical machinery, petroleum machinery, telecommunications, instruments and other industrial fields.

The more compression of o-rings, the better

The conventional wisdom is that the more O - ring seal is squeezed (that is, deformed relative to its "squeeze" state), the tighter the seal. More extrusion equals o-ring, which matches the greater force between the hardware - i.e., liquid, gas and dry powder that would otherwise flow from the rubber seal to the matching hardware.

This is squeezed more and an O ring tends to hold its force (and therefore seal better) longer than an O ring that is squeezed less. The failure of an elastomer to maintain its "push back" force over time is known as compression variability. An elastomer with a high compression permanent deformation (usually more than 80%) no longer returns to its original uncompressed shape when it is not squeezed. However, the assumption that increasing the squeeze on the o-ring will result in a better seal may not always be correct, depending on other factors. These include:

Install the damage

The more forcefully you squeeze the o-rings during the installation, the more likely you are to pinch them because of the way leaks are created. This was found when parker compared the behavior 2 finite element models used to predict the mounting of the O - rings at 40% and 25% extruded. At 40 percent, pinching between mating parts of the o-ring is unavoidable, and at 25 percent of the mounting clamping is virtually eliminated.

Mating hardware damage

The relationship between the amount of non-extrusion and the compression load required to maintain the extrusion is linear. In fact, compression loads rise by more than 30% of the extrusion much faster. The o-ring takes almost two and a half times as much load to compress to a 40 % fluoroelastomer seal as it does with some common problems up to 25% more. This level of compression load can flatten or deform lightweight or brittle mating parts.

application

Although many variables affect the form, fit and function of the seal ring, the rear leak-free seal is the most important parameter which is the amount of extrusion applied. However, as these data show, the ideal amount of extrusion itself is subject to many factors. You can't just assume that more is better.