Apiezon Greases are unique products, designed for use in high vacuum work:
- Excellent lubricants
- High purity, low vapor pressure – non-contamination in analysis
- The working temperature range of each grease is dependent on the grade that is used
- Easily applied, easily cleaned off
- Silicone free. This benefits scientific users because the risk of sample contamination and consequently the risk of interference in analytical techniques such as infra-red or mass spctrometry, etc. is avoided
- Approved by NASA and NATO
| Typical Property |
L |
M |
N |
Main area of
application |
High Temp |
High Vacuum |
General Vacuum |
Melting Point:
ASTM.D 566 |
°C
°F |
42-52
108-126 |
40-60
104-140 |
42-52
108-126 |
| Working temp. range |
°C
°F |
10-30
50-86 |
10-30
50-86 |
-269-30
-452-86 |
Vapor Pressure
Torr @20°C |
7x10-11 |
1.7x10-9 |
6x10-10 |
| Relative Density 20°C |
0.896 |
0.894 |
0.911 |
| Radiation Resistance |
Yes |
Yes |
No |
Outgassing
Characteristics
ASTMS .E
595-90 |
TML
CVCM |
<1.0%
<0.1% |
-
- |
<1.0%
<0.1% |
Lubricity 4 Ball Test
ASTM .D 2763
(IP 239), Kg |
150 |
140 |
150 |
Viscosity of molten
grease, cP |
50°C
100°C |
766
62.3 |
413
29.8 |
-
- |
Coefficient of
expansion per °C
over 20°C-30°C |
0.00076 |
0.00075 |
0.00072 |
Thermal conductivity,
w/m°C |
0.216
- |
0.194
- |
0.194
0.095 |
Latent heat of fusion,
cal/g |
15.1 |
18.7 |
15.0 |
| Fusion Peak °C |
32 |
34 |
31 |
| Vol. resistivity, cm |
1.2x1016 |
2.6x1016 |
2.0x1016 |
| Permittivity |
2.3 |
2.1 |
2.3 |
| Loss tangent |
<0.0001 |
<0.0001 |
<0.0001 |
Surface breakdown
at flash over, kV |
24 |
28 |
27 |
| Electric strength, V |
730 |
850 |
820 |
*Too close to room temperature to measure
Apiezon Grease; Type N
Similar to Apiezon Grease Types: L and M, but Type N grease has a special additive which gives it a tenacious, rubbery consistency and provides an extra cushioning effect which absorbs vibrations in equipment, making N grease invaluable in fragile glass to glass joints, like burette taps, which continually risk fracture. Grease N is widely recognized and recommended as the cryogenic vacuum grease of choice.