Major Halocarbons: Statistics and Uses

Major Halocarbons: Statistics and Uses

Chemical 1986 Atmospheric
Concentration
(pptv) Atmospheric Lifetime
(years) Current Annual
Atmospheric Concentration
Growth Rates
(%/yr) Major Uses

Chlorofluorocarbons

CFC-11 (CFCl₃)

226

75 (+32,-17)

4

Aerosols
Foams

CFC-12 (CF₂Cl₂)

392

111 (+289,-46)

4

Aerosols
Refrigeration

HCFC-22 (CHClF₂)

~100

20

7

Refrigeration

CFC-113 (C₂Cl₃F₃)

30-70

90

11

Solvents

Halons (Bromofluorocarbons)

Halon-1211

~2

25

>10

Fire Extinguisher

Halon-1301 (CBrF₃)

~2

110

>10

Fire Extinguisher

Chlorocarbons

Carbon tetrachloride (CCl₄)

75-100

~50

1

Production of
CFC-11 & CFC-12

Methylchloroform (CH₃CCl₃)

125

5.5-10

7

Solvents

Sources: U.S. EPA, 1988a; Hammitt et al., 1987; Wuebbles, 1983; WMO, 1985.


Chemical	1986 Atmospheric Concentration (pptv)	Atmospheric Lifetime (years)	Current Annual Atmospheric Concentration Growth Rates (%/yr)	Major Uses

Chlorofluorocarbons
CFC-11 (CFCl₃)	226	75 (+32,-17)	4	Aerosols Foams
CFC-12 (CF₂Cl₂)	392	111 (+289,-46)	4	Aerosols Refrigeration
HCFC-22 (CHClF₂)	~100	20	7	Refrigeration
CFC-113 (C₂Cl₃F₃)	30-70	90	11	Solvents
Halons (Bromofluorocarbons)
Halon-1211	~2	25	>10	Fire Extinguisher
Halon-1301 (CBrF₃)	~2	110	>10	Fire Extinguisher
Chlorocarbons
Carbon tetrachloride (CCl₄)	75-100	~50	1	Production of CFC-11 & CFC-12
Methylchloroform (CH₃CCl₃)	125	5.5-10	7	Solvents