ASTM D1121 – Reserve Alkalinity of Engine Coolants and Antirusts
Metals in engine cooling systems are prone to acid-catalyzed corrosion. If coolants become acidic, such as from exhaust gas leakage or coolant oxidation, system components may be at risk of damage. Buffers are often added to maintain pH at the proper level. The test determines the reserve alkalinity of a coolant; how much acid a coolant can absorb before it reaches a pH of 5.5. It may be used for new or used coolants, anti-rust compounds, coolant additives and aqueous dilutions of coolants.
The sample is placed in a beaker and distilled water is added if needed to create the proper concentration. The solution is titrated with a standardized hydrochloric acid solution to a pH of 5.5. The reserve alkalinity is reported in ml of 0.100N HCl per 10ml sample.
Price: $122.00
Sample size: 20 ml
Related tests:
- ASTM D974 – Acid or Base Number by Color-Indicator Titration; Neutralization Number
- ASTM D1287 – pH of Engine Coolants and Antirusts (Glycol)
- ASTM D1384 – Glassware Corrosion of Antifreeze one test cell for screening
- ASTM D2896 – Base Number – Perchloric Acid Method
- ASTM D4739 – Base Number Total, by Hydrochloric Acid Method