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ASTM D1881

ASTM D1881 is a standard test method used to evaluate the foaming tendency and foam stability of engine coolants and cooling system fluids. The method determines how readily a coolant forms foam when air is bubbled through the liquid under controlled laboratory conditions and how quickly that foam dissipates after aeration stops.

During the test, a specified volume of coolant is maintained at a controlled temperature while air is introduced at a constant flow rate through a diffuser. At the end of the aeration period, the height or volume of the foam is measured immediately to determine the foaming tendency. After a specified settling period, the remaining foam is measured to determine the foam stability.

The test is widely used by coolant manufacturers and laboratories for quality control, product development, and specification compliance. Effective engine coolants should exhibit low foaming tendency and rapid foam collapse, ensuring efficient heat transfer, reliable coolant circulation, and reduced risk of coolant loss or pump cavitation in automotive and industrial cooling systems.

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    Tamson ASTM D1881 Foaming Bath (Single)
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General

ASTM D1881 is a standard test method for determining the foaming tendency of engine coolants and aqueous heat transfer fluids. The test evaluates the tendency of a coolant to form foam when air is introduced under controlled laboratory conditions. Excessive foaming can reduce cooling efficiency, promote coolant loss, and impair the performance of automotive and industrial cooling systems. The method is widely used for product development, quality control, and specification compliance.

Precision

ASTM D1881 includes repeatability (r) and reproducibility (R) values established through interlaboratory testing. Reliable results depend on proper control of air flow, temperature, test duration, and the cleanliness of the glassware and diffuser. Consistent operating conditions are essential to achieve the precision specified in the standard.

Test

The method determines the foaming tendency and foam stability of an engine coolant by measuring the foam produced during aeration and the foam remaining after a specified settling period.

Reported results:

  • Foam volume after aeration
  • Foam volume after settling

Unit:

  • Millilitres (mL)

Lower foam volumes and rapid foam collapse indicate better anti-foaming performance and are desirable for efficient cooling system operation.

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  1. 21-50L 1 item