There are more than 400 types of standard and non-standard orings. Unless you want a disaster like the Challenger explosion in your application, you need to weed through these and pick the right one. However, most people don’t know where to start sorting. Here are some things that you should consider if you want to find the right orings.
Your hardware design limitations should be the first consideration. Traditional oring grooves are wider than the ring and rectangular in shape. This allows the oring to be compressed and expand from heat or fluids. Once you have the approximate size of your groove, you can narrow your options based on diameter.
Once you have an approximate size, the best option will be to find a commercially available oring. Browse the internet or your supplier’s catalog to get an idea of your options. Your first search should be for the appropriate diameter. Then, search for the right thickness.
The term compression set refers to the failure of an oring to return to its original size after being used for a period of time. You want to look for seals with good compression set resistance because they will last longer. The material used to make the oring and how it reacts with your application can give you an idea of the compression set. Keep in mind that thicker seals tend to have higher compression sets.
The last thing you need to consider is potential tolerances. Thicker orings tend to be the better option when you have higher tolerances. When you have more precise tolerances, it is better to go with thinner orings and replace them more often.
Choosing the right orings for your application is important. Following these guidelines can help you get started on your quest for the right match.