⦿ O-Ring Size Chart – Provides AS-568 Standard 
⦿ O-Ring Sizes Chemical Compatibilities Table – Check the material you should be using for whatever chemicals the seal will come in contact with to ensure the seal you choose will last as long as possible.
⦿ Temperature Range for Common Elastomeric Materials – Make sure the material you choose is used within its temperature tolerances.
⦿ Glossary –
⦿ Conversion Charts – Need help converting standard to metric or metric to standard or Fahrenheit to Centigrade.