Isobutane
Inert
Propane, 2-methyl-
Isobutane is a propellant that pressurizes aerosol cans. It plays no role in repelling insects.
Products using it

Avon
Skin So Soft Bug Guard Plus Picaridin Aerosol Spray
95
Picaridin 10%
Complete protection
Mosquitoesest.5–7h
Ticksest.5–8h

Not recommended
Combination sunscreen/repellent
Avon
Skin So Soft Bug Guard Plus IR3535 Expedition Aerosol Spray SPF 28
76
Octocrylene 9% · Octinoxate 6.75%
Complete protection
Mosquitoesest.4–8h
Ticksest.5–8h
Regulatory notes
Source: EPA SRS active ingredient list export. Minimum risk (25(b)) status is applied separately when applicable.