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Temperature conditioning of foam concentrates

Date of issue:2020-06-10 19:37 Number of visits:

Temperature conditioning of foam concentrates
D. l General
If the fbam concentrate is claimed by the supplier not to be adversely affected by storage at -30 °C, condition the sample in accordance with E.2 and then in accordance with E.3; otherwise, condition only in accordance with E.3.
D. 2 Low temperature conditioning
D. 2.1 Apparatus
E.2.1.1 Freezing chamber, capable of achieving a temperature of (-30 ± 3) °C.
E.2.1.2 Sample containers, in accordance with Annex B.
NOTE More than one container can be needed to condition sufficient volume of foam concentrate for subsequent testing.
E.2.2 Procedure
Set the temperature of the freezing chamber to (-30 ± 3) °C.
Do not agitate the content of the container(s) at any time until the sample of foam concentrate has been divided into top and bottom half-samples (see E.4).
Place the sample container(s) in the freezing chamber and maintain at the required temperature for (24 ± 1) h. At the end of this period store the container(s) for not less than 48 h and not more than 96 h in an ambient temperature of (20 ± 5) °C.
Repeat three times so that there are four cycles of freezing and thawing before testing.
E.3 High temperature conditioning
E.3.1 Apparatus
D. 3.1.1 Oven, capable of achieving a temperature of (60 ± 3) °C.
E.3.2 Procedure
Set the temperature of the oven to (60 ± 3) °C.
If the foam concentrate sample has not been conditioned in accordance with E.2 use foam concentrate sample in accordance with Annex B; otherwise use containers conditioned in accordance with E.2. Do not agitate the content of the container(s) at any time until the sample of foam concentrate has been divided into top and bottom half-samples (see E.4).
Place the container(s) in the oven and maintain at the required temperature for 7 d. At the end of this period store the container(s) for not less than 48 h and not more 96 h in an ambient temperature of (20 ± 5) °C.

E.4 Division into top and bottom half-samples
E.4.1 Apparatus
E.4.1.1 Top half-sample container(s)
Sealable empty container(s), suitable for the foam concentrate to be tested, of minimum half the volume of the sample container(s) as described in Annex B.
E.4.1.2 Divider device
After conditioning, the top sample from the sample container shall be divided from the bottom sample by pressurizing the sample container and force the top sample through a delivery pipe into the top sample container described in E.4.1.1. A principle sketch of the divider and sample container is shown in Figure E.l.
The delivery pipe and the pressure inlet can be fitted to the lid of the original sample container. In practice it might be necessary to use different fittings depending on the design of the lid and sample container. Be sure that the fitting between divider and the lid is air tight to keep the pressure needed to force the foam concentrate through the delivery pipe.
In order to ensure that there is no mixture between the top sample and the bottom sample during the division process, the delivery pipe shall be adjustable in vertical direction. The inlet of the delivery pipe shall be conical and equipped with a plate in order to provide a horizontal flow into the pipe as shown in Figure E.l. In order to make it possible to mount the delivery pipe either the cone and plate shall be detachable or the delivery pipe shall be designed in a way that it can be mounted through the lid. Other suitable design of the divider device is permitted provided that the function is the same.


 
Key
1 air pressure pipe
2 delivery pipe diameter (8 to 15) mm
3 detachable cone and plate, diameter (25 to 35) mm, height (40 to 50) mm, distance between cone and plate
(10 to 12) mm
4 sample container approximately 25 I
5 top sample
6 bottom sample
Figure E.l — Example of a suitable equipment to divide the conditioned foam concentrate into
top and bottom half-samples
E.4.2 Procedure
Mount the divider device to the sample container. Adjust the delivery pipe in vertical direction so that the inlet of the delivery pipe is positioned below the surface, on a vertical distance of approximately 1/3 into the top half-sample. Pressurize the sample container carefully and start collecting the top halfsample foam concentrate into the empty top half-sample container. Interrupt the pressurizing just before the foam liquid surface reaches the inlet of the delivery pipe. Lower the delivery pipe another 1/3 into the top half-sample and repeat the procedure twice. At the end of the dividing process, the top half-sample shall have been collected from three levels.
The bottom half-sample should preferably be kept in the original sample container.
Before subsequent testing starts of the top and bottom half-samples for Clauses 8, 10 and 12, the top half-container and the bottom half-sample container shall be agitated in order to provide a homogenous foam sample.



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