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 |
Main area of
application |
High Temp |
High Vacuum |
Melting Point:
ASTM.D 566 |
°C
°F |
42-52
108-126 |
40-60
104-140 |
| Working temp. range |
°C
°F |
10-30
50-86 |
10-30
50-86 |
Vapor Pressure
Torr @20°C |
7x10-11 |
1.7x10-9 |
| Relative Density 20°C |
0.896 |
0.894 |
| Radiation Resistance |
Yes |
Yes |
Outgassing
Characteristics
ASTMS .E
595-90 |
TML
CVCM |
<1.0%
<0.1% |
-
- |
Lubricity 4 Ball Test
ASTM .D 2763
(IP 239), Kg |
150 |
140 |
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 |
Thermal conductivity,
w/m°C |
0.216
- |
0.194
- |
Latent heat of fusion,
cal/g |
15.1 |
18.7 |
| Fusion Peak °C |
32 |
34 |
| Vol. resistivity, cm |
1.2x1016 |
2.6x1016 |
| Permittivity |
2.3 |
2.1 |
| Loss tangent |
<0.0001 |
<0.0001 |
Surface breakdown
at flash over, kV |
24 |
28 |
| Electric strength, V |
730 |
850 |
*Too close to room temperature to measure
Apiezon Grease; Type M
Similar to Apiezon Grease Type L, but it contains more wax.
Grease M has an estimated vapor pressure @ 20°C of 2x10-9 torr, higher than Type L. Type M is recommended for applications where a grease of moderately low vapor pressure is required; such as for sealing ground joints on the backing side of oil diffusion pumps.