25#,45# transformer oil

Uninhibited Oil

Inhibited Oil

Test Method

I

II

III

IA

IIA

III A

appearance

Clear, no suspended matter and precipitation

Clear, no suspended matter and precipitation

Density (30°C) Max.

895

895

ISO 3675

40°C Max.

16.5

11.0

3.5

16.5

11.0

3.5

-15°C Max.

800

-

-

800

-

-

-30°C Max.

-

1800

-

-

1800

-

-40°C Max.

-

-

150

-

-

110

Flashing point (close cup) Min.

140

130

95

140

130

95

ISO 2719

Pour point Max.

-30

-45

-60

-30

-45

-60

ISO 3016

The neutralization value after oxidation Max.

0.40

-

Under slung fat lute after oxidation Max.

0.10

-

Volatility acid no. 0.28  Min.

120

Water content

Delivery in bulk Max.

IEC 733

30

30

Delivery in drum Max.

40

40

Breakdown voltage

Untreated oil  Min

ICE 156

30

30

Treated oil  Min.

50

10

dielectric loss factor

(90°C)  Min.

0.005

0.005

IEC 247

Analytical items

Limits

Test Method

trademark

10

25

45

appearance

Clear, no suspended matter and mechanical impurities

visual

Density @20°C Max.

895

GB/T 1884~GB/T 1885

Kinematic viscosity@40°C Max.

13

13

11

GB/T 265

Kinematic viscosity@-10°C Max.

-

200

-

GB/T 265

Kinematic viscosity@-30°C Max.

-

-

1800

GB/T 265

Pour point°C Max.

-7

-22

report

GB/T 3535

Solidifying point°C Max.

-

-45

GB/T 510

Flashing point  (close cup)°C Min.

140

135

GB/T 261

Acid no. Max.

0.03

GB/T 264

Oxidation stability:

1. Acid number after oxidation Max.

2. Precipitation after oxidation % Max.

0.05

SH/T 0206

Breakdown voltage(space between 2.5mm) Min.

35

GB/T 507

Dielectric loss factor (90°C) Max.

0.005

GB/T 5654