Gear Lubricants
Product Data
castrol.com/GPS
800 255 4417
May 2025
GPS
Castrol
®
Alpha™ HC
Field Test Results
Castrol Alpha HC was field tested at two national heavy-duty construction companies. e field test was
designed to test the following criteria: oxidation resistance, wear protection, low temperature performance
and seal compatibility. In compressor units at one of the sites, several candidate fluids were tested. Castrol
Alpha HC was pitted against a commercial mineral fluid and a commercial synthetic (PAO) fluid in most of
these tests. e results are as follows:
RPVOT Oxidation Life Test
In the RPVOT Oxidation Life Test, a fluid is heated in pure compressed oxygen to determine how long it would
take for the fluid to fail. As shown in the chart below, Castrol Alpha HC was tested at field test intervals from 8
to 835 hours. Even aer 835 hours of use, Castrol Alpha HC's minutes to oxidation still exceeded that of a new
commercial mineral and synthetic fluid.
RPVOT Oxidation Life Test ASTM 2272
0
500
1000 1500
Minutes to Oxidation
835 hours
641 hours
435 hours
141 hours
8 hours
0
hrs
0 hours
Castrol Alpha HC
Synthetic Oil (New)
Mineral Oil (New)
new
oil
ASTM D 2272 (Rotating Bomb) Procedure
In another test for oxidation resistance, Castrol Alpha HC outperformed several test fluids, showing
exceptionally long fluid life.
E13
r---- I ■
■
■
ecastrof
