Apiezon AP201 vapor booster fluid is specifically formulated to resist attack from air in gases being pumped and to be thermally stable at temperatures encountered in booster pump boilers. In addition, AP201 is highly resistant to traces of moisture in the gases being pumped.
The vapor pressure characteristics of AP201 ensure that an ultimate pump pressure below 10-5 torr is obtainable and that the high boiler pressures necessary to generate the very powerful vapor jets in booster pumps can be achieved without excessive boiler temperatures.
Apiezon AP201 has a low viscosity. This ensures that it is easily drained from systems at service time, thus reducing contamination from old oil remaining in the pump while also reducing pump draining and filling times.
Vapor booster pumps are used in industrial vacuum processes that require high volumes of gas throughput.
As a result of technological advantages inherent in the oil, AP201 has a typical service life much longer than that of less expensive, lower quality oils. This is illustrated by a “ruggedness test” in which oil in a diffusion pump is subjected to repeated cycles of 10 minutes of normal operation followed by a 5 minute period with the boiler heated off and the pump open to the atmosphere.
The oil and the jets are examined frequently, and the performance of the pump monitored. Cheaper oils rapidly deteriorate, showing an increase in viscosity and darkening in color. After 200 cycles, the pump jets and body are covered with a tarry black deposit. After 500 cycles, the deposits are so heavy that the pump fails to operate.
With AP201, the pump continues to operate efficiently for over 1000 cycles; throughout the test, the oil remains clear. The pump jets and baffles remain free from tarry deposits, thus ensuring easier and quicker pump cleaning and servicing.
|Vapor pressure at 20ºC (torr)||4x10-6|
|Specific gravity at 20ºC||0.885|
|Viscosity at 20ºC (cSt )||76|
|Viscosity at 40ºC (cSt )||22|
|Flash point (ºC)||196|
|Fire point (ºC)||>200|
|Pour point (ºC)||-30|
|Boiling point at 1 torr (ºC)||165|
|Autoignition point (ºC)||>320|