32 Lubricant Additives: Chemistry and Applications

TABLE 1.5Conditions of Oxidation Test MethodsTest

Test

Designation

Oxidation Regime

Temperature

(°C)

Gas

Gas Flow or Initial Pressure

Catalyst

Sample Size

EOT

Parameter Measured

PDSC

D 6186

Thin fi

lm

130, 155, 180, 210

O

2

500 psi, 100 mL/m

None

3.0 mg

Occurrence of oxidation exotherm

OIT

PDSC

CEC L-85

Thin fi

lm

210

Air

100 psi, no fl

ow

None

3.0 mg

120 min maximum

OIT

TEOST 33C

D 6335

Bulk

100, 200–480

N

O, (^2) moist air
3.6 mL/min
Fe naphthenate
116 mL
12 Programmed cycles
Deposits
TEOST MHT
D 7097
Thin fi lm
285
Dry air
10mL/m
Oil-soluble Fe, Pb, Sn
8.4 g
24 h
Deposits, volatile
TFOUT
D 4742
O
uptake, thin (^2) fi lm
160
O
2
90 psig
Fuel, naphthenates of Fe, Pb, Cu, Mg, and Sn, H
O 2
1.5 g
Sharp pressure drop
OIT
TOST
D 943, D 4310
Bulk 95
O
2
3.0 L/h
Fe, Cu, H
O 2
300 mL
∆TA N

2.0
1000 h
TAN, sludge, metal weight loss
IP48
IP48
Bulk
200
Air
15 L/h
None
40 mL
6 h
×
2
Viscosity, carbon residue
IP 280/CIGRE
IP 280
Bulk
120
O
2
1 L/h
Cu, Fe naphthenates
25 g
164 h
Volatile acids, oil acidity, sludge
RPVOT
D 2272
O
uptake 2
160
O
2
90 psig
Cu, H
O 2
50 mL
∆P

25 psi
OIT