super coolant af-nac

Komatsu Genuine Supercoolant AF-NAC

Supercoolant AF-Supercoolant AF-NACNAC 　　（ＥＧ）（ＥＧ）　　 vs.vs.

Ｃｏｍｍｅｒｃｉａｌｌｙ　ＡｖＣｏｍｍｅｒｃｉａｌｌｙ　Ａｖａｉｌａｂｌｅ　ａｉｌａｂｌｅ　

Ｐｒｏｐｙｌｅｎｅ　ＧｌｙｃｏＰｒｏｐｙｌｅｎｅ　Ｇｌｙｃｏｌ　（ＰＧ）　ｌ　（ＰＧ）　ＣｏｏｌａｎｔＣｏｏｌａｎｔ

Ｓｕｐｅｒｃｏｏｌａｎｔ　ＡＦ－ＮＡＣ（ＥＧ）　 vs. Propylene glycol (PG)

PG　Ｃｈａｒａｃｔｅｒｉｓｔｉｃｓ PG has the same physical properties as EG PG has 1/3 toxicity against EG PG shows the same environmental effect as EG

No government confirms environmental merit on PG against EG because of small difference between PG and EG

Unit Supercoolant AF-NAC (EG) Propylene Glycol (PG) Remark

Boiling Temperature °C @ 100% 198 187Freezing Temperature °C@30% -17 -14Viscosity centi- poise@30% & @100°C 0.48 0.49Specific Heat cal/g °C @30% & @100 °C 0.93 0.97Thermal Conductivity x10-3al/cm °C @30% & @100 °C 1.19 1.19

Oral Toxicity Test (Rat) LD50 g/kg(Lethal dose g/ Body Weight kg)

8.5 26.4 Larger value is better

BOD (Biological Oxygen Demand;Concentration of biodegradableorganic matter in water)

ppm 730,000 1,000,000

COD (Chemical Oxygen Demand;Amount of organic compounds inwater)

ppm 1,370,000 900,000

Biodegradability % 100 100 Higher value is better

Items

Lower value is better

Physical Property

Toxicity (Poisonous)

Environmental Effect

PG

Supercoolant AF-NAC(EG)

Test Hours

Deg

rad

atio

n P

rod

uct

Good

Bad

Test HoursAcid

Alkalinity

PG

Supercoolant AF-NAC(EG)

Unstable ＰＧ Property

Demerit of PG PG has poor thermal stability comparing that of EG PG generates harmful degradation products on corrosion PG cause pH reduction

Komatsu has not a plan to introduce PG coolant

Thermal Stability Test Results

Performance of Commercially Available PG Coolants

JIS Corrosion Test Results of PG Coolants PG coolants showed very poor anti-corrosion properties Supercoolant AF-NAC has the best anti-corrosion Supercoolant AF-NAC has the best anti-corrosion Performance Performance

Komatsu recommend to use Supercoolant AF-NAC

0

0.2

0.4

0.6

0.8

1

1.2

1.4

Me

tal C

orr

sio

n,

mg

/cm

2

Komatsu GenuineSupercoolant AF-NAC

PG Coolant A PG Coolant B

JIS Corrosion Test

AlCast IronSteelBrassSolderCopper

Upper Limit

Environmental Friendless of Supercoolant AF-NAC

Komatsu Genuine Supercoolant has the best environmentally Friendly Property Attention! Some commercially available PG coolants contain toxic substance; nitrite, against animals and plants (especially rice)

NNYEthylene glycol11

BiodegradableYYNPropylene glycolBase Coolant

10

NoYYYOrganic acid9

YYYAzol8

Generate carcinogenic substance NNNAmineOrganic7

NoYYYmolybdate 6

NoNNNSic ate5

NoYNNNitrate4

Withered of Rice, Generate carcinogenic substance

YYNNitrite3

Withered, ToxicYNNBorate2

Nutrient enrichment YNY(<0.3%)PhosphateInorganic1

Environmental EffectCommercially Available PG

Coolant B

Commercially Available PG

Coolant A

Komatsu Genuine Supercoolant

AF-NAC

Additive and Base CoolantNo.

NNYEthylene glycol11

BiodegradableYYNPropylene glycolBase Coolant

10

NoYYYOrganic acid9

YYYAzol8

Generate carcinogenic substance NNNAmineOrganic7

NoYYYmolybdate 6

NoNNNSic ate5

NoYNNNitrate4

Withered of Rice, Generate carcinogenic substance

YYNNitrite3

Withered, ToxicYNNBorate2

Nutrient enrichment YNY(<0.3%)PhosphateInorganic1

Environmental EffectCommercially Available PG

Coolant B

Commercially Available PG

Coolant A

Komatsu Genuine Supercoolant

AF-NAC

Additive and Base CoolantNo.

Effect of commercially available PG coolants on Construction Equipment

1. Cavitation-pitting problems of engine cylinder-liner and water-pump impeller may be caused by poor anti-corrosion performance against cast iron

2. Water leakage from Radiator may be caused by poor solder protection property

3. Harmful to environment due to containing nitrite inhibitor

Summary of PG Coolant

super coolant af-nac

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