The Exchange Test Method
LABORATORY TEST METHOD NO. H-9: FOAMING
Issue Date: 30 Apr 1993
Revision Date:09/30/2011
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PURPOSE:
To determine the amount of foam produced by various liquids.
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PRINCIPLE:
Predetermined amount of test liquid is, mixed with water in a cylinder and by gravitational impact of solution, foam 1S produced and measured.
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REFERENCES:
ASTM D 1173-07 – Standard Test Method for Foaming Properties of Surface Active Agents
ASTM D 2281-10 – Standard Test Method for Evaluation of Wetting Agents by Skein Test.
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APPARATUS AND MATERIALS:
- 4.1 Graduated glass cylinder with lid, 500 ml capacity and graduated to 5 ml increments.
- 4.2 Two ml capacity eye dropper with 0.5 ml graduations.
- 4.3 Dispensing type thermos
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PROCEDURE:
- 5.1 Fill thermos with water at 43°C (110° F).
- 5.2 Dispense 100 ml of water into graduated cylinder.
- 5.3 Using eye dropper drop 1 cc of specimen into water and place lid on cylinder.
- NOTE: Be careful to drop specimen straight into water. The specimen drop should not touch sides of cylinder with liquid.
- 5.4 Invert cylinder. Turning upside down and right side up five times.
- 5.5 Immediately after inversion read graduation marks on cylinder at the water level, and on the largest mass of foam. (Disregard stray bubbles).
- 5.6 Make note of these two figures then subtract the lowest from the highest. This figure represents foam height measurement.
- 5.7 Rinse and clean cylinder and dropper with warm water to make sure no soapy residue is left in the cylinder.
- 5.8 Repeat procedure 5.1 through 5.6. Take at least five observations.
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EVALUATION:
Calculate the average of the foam height for each sample tested.
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REPORT
Report the average foam height in ml.