90 Durometer is suggested for polyurea applications due to higher temps and pressures.
Regular grade is a mix of 70 and 80 durometer.
Regular Viton seals are standard. The 90 DXP is a harder O-Ring and holds up better with higher temps and pressure used for Polyurea. The DuPont XT Blue are our most chemical resistant seals we offer that resist solvents that cause some seals to swell or dry out.
