Automotive coolants, Radiator coolants,
Antifreeze formulations and ingredients,
PATENT US5422026
TABLE 3__________(WT %)COMPONENT CONCENTRATION
Propylene Glycol 95.365
Water 2.00
Sodium Tetraborate Decahydrate 0.45(Na2 B4 O7.10H2 O)
Sebacic Acid 0.25(C10 H18 O4)
Sodium Molybdate (VI) Dihydrate 1.00(Na2 MoO4.2H2 O)
Sodium Mercaptobenzothiazole, 50% soln 0.25(NaC7 H4 NS2)
Sodium Nitrate 0.15(NaNO3)
Tolyltriazole (methylbenzyltriazole) 0.125(C7 H7 N3)
Sodium Metasilicate Pentahydrate 0.20(Na2 SiO3.5H2 O)
Sodium Hydroxide 0.15(NaOH)
Q 1-6083* 0.05(silicate stabilizer)
Pluronic L-61** 0.01(antifoam)
* Polysiloxane manufactured by Dow Corning.
**Polyoxypropylene polyoxyethylene block copolymer
manufactured by BASF.
The concentrate was subjected to
certain standard ASTM tests to determine its suitability.
The following are the results attained:
ASTM TEST RESULTSD-1384
Corrosion Test for Engine Coolants in Glassware
Coupon Avg. Weight Loss, mg Max Allowed*
copper 3 10
solder 1 30
brass 3 10
steel 3 10
cast iron 3 10
aluminum 0 30
D-4340 Corrosion of Cast Aluminum Alloys in
EngineCoolants Under Heat-Rejecting Conditions
Average Weight Loss, mg/cm2/week Max Allowed* 0.17 1.0
D-2570 SimulatedService Corrosion Testing of
Engine Coolants
Coupon Avg. Weight Loss, mg Max Allowed*
copper 9 20
solder 3 60
brass 7 20
steel 2 20
cast iron 1 20
* Maximum corrosion weight loss as specified in
ASTM D3306-89 specification for EG base engine coolants.
From these results it can be seen that
the concentrate composition of the invention
passed these ASTM test requirements by a wide margin.
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