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LABORATORY TEST METHOD NO. H-9
FOAMING
1. PURPOSE:
To determine the amount of foam produced by various liquids.
2. PRINCIPLE:
Predetermined amount of test liquid is, mixed with water in a
cylinder and by gravitational impact of solution, foam 1S produced
and measured.
3. REFERENCES:
ASTM D 1173-53 (2001), Test Method for F?aming prop~rties of Surface
Active Agents, and D 2281-68 (1997), Method for Evaluat1on of Wett1ng
Agents by Skein Test.
4. 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
5. 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.
6. EVALUATION:
Calculate the average of the foam height for each sample
tested.
7. REPORT
Report the average foam height in ml.
_HARDLINES
TEST METHOD_
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