The work aims to select the sealing material of isopropyl nitrate (IPN) based on the solvent resistance principle. The fact that nitrile rubber (NBR) and IPN would result in swelling effect was verified by calculating the solubility parameters. According to the principle of solvent resistance, EPDM rubber and polytetrafluoroethylene (PTFE) were selected instead of NBR. Then, the difference between the solubility parameters of each material and IPN was compared. IPN was within the range of NBR soluble sphere and the three-dimensional solubility parameters of both were very close. The one-dimensional solubility parameters of IPN, EPDM and PTFE were 8.6, 7.7 and 5.14, respectively. The solubility parameters of EPDM and IPN were close to each other; the solubility parameters of PTFE and IPN were quite different. EPDM and PTFE are more suitable for sealing IPN than NBR, and EPDM is the most suitable for sealing IPN.