R141b (1,1-Dichloro-1-fluoroethane), Dichlorofluoroethane, Freon 141b, 'Ethane, 1,1-dichloro-1-fluoro-', HCFC-141b, Genetron 141b, is a haloalkane with the formula C₂H₃Cl₂F. It is one of the three isomers of dichlorofluoroethane. It is liquid belongs to the hydrochlorofluorocarbon family(HCFC).

1. Store in a clean, dry place. Don't heat ≥ 52 ℃ (126 F).
2. Cylinders should be stored upright and firmly secured to prevent falling or being knocked over. Valve protection caps and valve cutlet threaded plugs must remain in place unless container is secured with valve outlet piped to use point. Do not drag, slide or roll cylinders.
3. Separate full containers from empty containers.
4. Avoid area where salt or other corrosive materials are present.

5.Avoid excessive inventory and storage time.