6-4
Chapter 6 COOLANT
Circulation metal-
lic causticity
(98±2°C
[208.4±35.6°F],
1000 Hr,
30 vol %
(E.G)
50 vol %
(P.G)
Test piece
Mass
change
Aluminum, Cast
iron, Steel, Brass,
Solder, Copper
±0.30 mg/cm
2
External of test piece after the
examination
Not corrosion on surface excluding between
test piece and spacer. Discoloration is OK.
Properties of
liquid after the
examination
pH 7.0 to 9.0
pH change ±1.0
Pre-alkalinity change ±15 %
Precipitation 1.0 vol % or less
External of liquid
Not remarkable discoloration, separation
and gel.
Density
of ion
Fe, Cu, Al, Zn, Pb,
NH4+
10 ppm or less
Circulation metal-
lic causticity
(88±3°C
[190.4±37.4°F],
1000 ± 2 Hr,
30 vol %
(E.G)
Test piece
Mass
change
Aluminum ±0.60 mg/cm
2
Cast iron ±0.30 mg/cm
2
Steel ±0.30 mg/cm
2
Brass ±0.30 mg/cm
2
Solder ±0.60 mg/cm
2
Copper ±0.30 mg/cm
2
External of test piece after the
examination
Not corrosion on surface excluding between
test piece and spacer. Discoloration is OK.
Properties of
liquid after the
examination
pH 6.5 to 11.0
pH change Maximum ±1.0
External of liquid
Not remarkable discoloration, separation
and gel.
Condition of
parts
Pump seal Not trouble while the examination
Inside of pump case and blade Not remarkable corrosion
Rubber adapt-
ability
(30 vol %,
115°C [239°F],
360 Hr)
Silicon
Tensile strength change -60 to 0 %
Elongation change -40 to +20 %
Volume change 0 to +40 %
Hardness change -20 to +10 %
Acrylonitrile
butadiene rub-
ber
Tensile strength change 0 to +10 %
Elongation change -15 to +15 %
Volume change 0 to +40 %
Hardness change -10 to 0 %
Ethylene pro-
pylene diene
monomer
Tensile strength change 0 to +10 %
Elongation change -30 to 0 %
Volume change 0 to +10 %
Hardness change -10 to 0 %
Storage stability vol % (30 vol %, room temperature, 6 Hr) 0.3 or less
Table 6-2 LLC specification
Property Standard
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