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4.3. Check of density of a cooling liquid

PERFORMANCE ORDER

1. Ареометром measure relative density of a cooling liquid.

2. Take temperature of a cooling liquid and depending on temperature calculate concentration of antifreeze in a cooling liquid.

Parity between concentration of antifreeze in a cooling liquid and relative density

Temperature of a cooling liquid °C and relative density

Freezing temperature °C

Safe working temperature °C

Concentration of a cooling liquid

10

20

30

40

50

1,054

1,050

1,046

1,042

1,036

–16

–11

30 %

1,063

1,058

1,054

1,049

1,044

–20

–15

35 %

1,071

1,067

1,062

1,057

1,052

–25

–20

40 %

1,079

1,074

1,069

1,064

1,058

–30

–25

45 %

1,087

1,082

1,076

1,070

1,064

–36

–31

50 %

1,095

1,090

1,084

1,077

10,70

–42

–37

55 %

1,103

1,098

1,092

1,084

1,076

–50

–45

60 %

Example

Safe working temperature–15°C at the weighed relative density 1,058 and temperature of a cooling liquid 20°C
The prevention
If concentration of a cooling liquid below 30 %, anticorrosive properties of a cooling liquid go down. At concentration more than 60 % worsen frost resistance of a cooling liquid.

Recommended cooling liquid

Antifreeze The antifreeze maintenance in a cooling liquid

Этиленгликоль 50 %