| Identifying the fluorocarbons structure from their number |
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Abbreviation key CFCs, HCFCs, HFCs |
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| CFCs |
= |
Chloro |
fluorocarbons |
| HCFCs |
= |
Hydro chloro |
fluorocarbons |
| HFCs |
= |
Hydro |
fluorocarbons |
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Principle for identifying pure fluorocarbons formula from its number |
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- add 90 to the product number
- the result is a 3-digit number XYZ where :
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Principle for identifying blends of fluorocarbons |
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HFC refrigerant blends (i.e. mixtures of pure refrigerants) are simply numbered after an internationally accepted nomenclature. There is no logical mean to identify them.
Blends having the same pure components but with different compositions are identified with upper cases (ex R 404A:near azeotropic refrigerant containing R 125, R 143a and R 134a) 44/52/4% by weight.
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Examples |
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- CFC 12
12 + 90 = 102
C = 1 H = 0 F = 2 Cl = (2 x 1) - 2 + 2 = 2
=> C Cl2 F2 or difluorodichloromethane
- HCFC 142b ()
142 + 90 = 232
C = 2 H = 3 F = 2 Cl = (2 x 2) - 3 - 2 + 2 = 1
=> CH3 - C Cl F2 or 1,1,1 chlorodifluoroethane (the number indicate here on which carbon the halogen is bound.
- HFC 134a
134 + 90 = 224
C = 2 H = 2 F = 4 Cl = (2 x 2) - 2 - 4 + 2 = 0
=> CH2F - CF3 or 1,1,1,2 tetrafluoroethane
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