| Man-Made Sources for CFCs |
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| q | There are two kinds of CFCs: freon-11 |
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| (CCl3F) and freon-12 (CCl2F2). |
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| q | Freon-11 has been used: |
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| (1) as a propellant in
spray cans |
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| (2) as a
blowing agent for producing foams |
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| (3) to clean semiconductor chips. |
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| q | Freon-12 has been used as |
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| (1) a refrigerant |
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| (2) working
fluid in most car air conditioners. |
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