8.02
Lubricants
TI008G0001
Mineral based industrial oils
These oils have been designed for different applications and also for some types of compressors.
In this case, too, there are standards specifying their features; please refer to DIN 51506 which classifies
the oils as VB-L, VC-L e VD-L, according to their possibility of working at different temperatures.
The latter is suitable for high temperatures and it is resistant to oxidation caused by the continuous mix-
ing with the air.
ISO 6743-3A classifies oils based on the operating temperature and pressure and, according to this
rule, for rotary vane compressors ISO-L-DAH o DAJ oils are recommended, which are for medium and
heavy applications.
The table indicates some typical values of the main characteristics.”
Typical featuress
Measuring Ambient temperature Ambient temperature
of Industrial Oils
unit
5 ÷ 40 -5 ÷ 30
Viscosity ISO VG
---
150
100
Viscosity at 40°
cSt
135 ÷ 165
90 ÷ 105
Viscosity at 100°
cSt
14 ÷ 16
10 ÷ 12
Viscosity Index
93 ÷ 100
100 ÷ 110
Pour point
°C
-10 ÷ -5
-15 ÷ -10
Flash point
V.A.
°C
230 ÷ 265
250 ÷ 265
Mass density
Kg/m
3
940 ÷ 960
940 ÷ 960
Values in the Table are merely indicative
General
Several oils are available on the market and research continuously improves their characteristics and it
changes the names and specifications.
When the warranty period is over, during which the use of Mattei Rotoroil lubricant is compulsory, the
user can decide to use the oil he believes most suitable or the available one, provided it is suitable for
rotary vane compressors.
Only manufacturers of lubricants can recommend the most suitable oil for the kind of machine and for
its specific application.
The user should then purchase the lubricant from an oil company or a distributor that guarantees its
suitability for the specific use.
The cost of the best lubricant is a small percentage of the total running cost of the machine: it is sug-
gested to purchase the best available on the market (see the section “
MATTEI LUBRICANTS
”).
Please consider that in lubricated and injection cooled compressors the oil performs the listed tasks and
it is subject to continuous working cycles; therefore, it should be highly resistant to oxidation to ensure
long life.
The oil should also provide a good demulsivity.
Anti-oxidizing additives should provide low volatile substances at the compressor operating temperatures,
so as to ensure protection between one oil filling and the other.
The user must adopt the kind of oil grade recommended by Mattei.
Please refer to the specific table for the choice, according to the operating conditions.
Available oils on the market
There are several kinds of oils on the market, including:
❑
mineral based industrial oils;
❑
synthetic oils.
