Main properties of HFC 365mfc
| Properties |
|
HFC 365mfc
|
HCFC 141b
|
| Formula |
|
CF3-CH2-CF2-CH3
|
CCl2F-CH3
|
| Molecular weight |
[kg/kmol] |
148.09
|
116.96
|
| Density at 25 °C |
[kg/cm3] |
1.26
|
1.23
|
| Boiling point |
[°C] |
40.2
|
32.0
|
| Freezing point |
[°C] |
-35
|
-103.5
|
| Flammable |
|
YES
|
NO
|
| Heat of vaporization at boiling point |
[kJ/kg.K] |
177
|
235
|
| Specific heat capacity of liquid at 25 °C |
[kJ/kg.K] |
1.47
|
1.16
|
|
Vapour pressure at
0 °C
25 °C
50 °C
|
[kPa]
[kPa]
[kPa] |
19
53
142
|
28
79
184
|
| Solubility of water at 20 °C |
[%] |
0.09
|
0.03
|
| Solubility in water at 20 °C |
[%] |
0.50
|
0.27
|
| Surface tension at 20 °C |
[mN/m] |
15.0
|
18.7
|
| Viscosity of liquid at 25 °C |
[mPa.s] |
0.40
|
0.42
|
| Dielectric constant at 25 °C |
|
12.3
|
7.9
|
| Refractive index at 20 °C |
|
1.280
|
1.369
|
| Kauri Butanol (KB) index |
|
13
|
56
|
Flammability Properties
| Property |
HCFC 141b |
HFC 365mfc |
Hydrocarbons |
| Flash point * |
None
|
< -27 °C
|
< -30 °C
|
| LFL in air [vol %] |
5.6
|
3.6
|
1-2
|
| Minimum ignition Energy [mJ] |
20.000
|
10.8
|
0.2
|
| Autoignition temp. [°C] |
532
|
594
|
260**
|
LFL: lower flammability limit in air * DIN 51755-T2
** for n-pentane and n-hexane
According to DIN 51755-T2 HFC 365mfc has a flash point also it has flammability limits in air. The minimum ignition energy is however 50 times higher than for hydrocarbons. Any ignition source below 10 mJ at room temperature and ambient pressure cannot ignite straight HFC 365mfc, whilst strong sources do, e.g.:
| electrostatic charges (floor covering or carpets) |
1 mJ no ignition
|
| special cases |
3–10 mJ no ignition
|
| electrostatic brush discharges |
< 4 mJ no ignition
|
| single sparks from hits (haammer) |
< 1 mJ no ignition
|
| shower of sparks from gem cutters |
< 100 mJ ignition
|
| sparks from welding |
< 10.000 mJ ignition |
The high LFL reduces however the flammability risk because a high concentration in air is needed in order to have a flammable atmosphere (38.000 ppm of HFC 365mfc). Blending of HFC 365mfc with non combustible compounds like Galden HT55 lead to non flammable solvent solutions.
The method of testing governs the flammability classification of a given substance. The flammability classification may deviate from country to country. The Japanese test methods for example show no flash point for Solkane 365mfc.
Vapour Pressure Curves of HFC 365mfc and HCFC 141b
The vapor pressure curves of HFC 365mfc and HCFC 141b are very similar, indicating that the practical use of Solkane® 365mfc will be comparable to HFC 141b.
Kauri Butanol Index of Various Solvents
The solvent potential of HFC 365mfc is characterized by a medium Kauri Butanol Index compared to other HFCs, which can be attributed to its chemical structure (absence of chlorine). Its solvency power is therefore lower than the conventional solvents listed in the previous table. That makes it the ideal cosolvent to adjust the solvency power of selected compositions.
Surface Tension of Various Solvents
In comparison with other solvents the surface tension of HFC 365mfc is rather low. That makes Solkane® 365mfc a perfect basis for high precision cleaning applications, where solvents based on HCFC 141b were used in the past. With its good wetting and creeping properties Solkane® 365mfc is an excellent solvent carrier for cleaning or coating of complex goods.
* Trichloroethylene (Trichloroethene) is classified as a class 2 carcinogene in the EC.
** CFC 113 is regulated by Montreal Protocol and amendments.
Quality
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