Dichlorodifluoromethane

• Difluorodichloromethane
• R12
• Freon -12
• Freon 12
• CFC-12

Colorless, non-flammable gas with ethereal odor

Gaseous

5.54 kg · m 3 (0 ° C)

-157.8 ° C

-29.8 ° C

570 kPa ( 20 ° C)

Poorly in water ( 300 mg · l -1)

Attention

1000 ml · m-3

10900 (in terms of 100 years)

-477.4 KJ / mol

Template: Infobox chemical / molecular formula search available

Dichlorodifluoromethane, also R12, Freon -12, is a non-toxic, colorless, non-flammable, inert, liquefiable gas. It is heavier than air, at high concentrations it has an asphyxiating.

It has been used as a refrigerant and propellant in aerosol cans, until it was banned by the CFC- Halon Prohibition Ordinance. Chemically, it belongs to the group of CFCs ( chlorofluorocarbons ) or freons. It damages the ozone layer when it comes into the higher atmosphere. It has an ozone depletion potential (ODP ) of 1, and was defined as the reference substance for the ODP.

At very high temperatures, it can also cause an explosion with certain high surface area materials (such as aluminum chips, potassium, zinc or magnesium).

PREPARATION AND USE

The production and use of CFCs, as well as R12, 1987 banned in the Montreal Protocol, as these substances destroy the protective ozone layer. Only emerging markets ( for example, China), the use for own use was permitted until 2010. Production volumes of R12 in China surpassed their own needs clearly, and R12 was also imported into the EU. Import bans were thereby circumvented by false declarations.