ISO 696-1975 pdf download – Surface active agents一Measurement of foaming power – Modified Ross- Miles method

02-20-2022 comment

ISO 696-1975 pdf download – Surface active agents一Measurement of foaming power – Modified Ross- Miles method. Measuring cylinder of 1 I capacity, complying with Is0…, with graduations at each 10 ml. The measuring cylinder stands in a water bath fitted with a thermostat, the bath being sufficiently large to accommodate the measuring cylinder Immersed up to half its height. Stand comprising a vertical rod, sufficiently long to allow the separating funnel and the measuring cylinder to be held in place. To ensure that the assembly is centred and so maintained during the measurement, the separating funnel is held by means of a ring supporting the spherical part, and a clamp placed as low as possible around the stem of the separating funnel, near the tap. The measuring cylinder is held in place by means of a screw-clamp with one movable jaw. Metering tube, stainless steel, 70 mm long, 1,9土0,02 mm internal diameter and 0,3 mm wall thickness. The ends of the tube shall be cut accurately at right angles to the axis of the tube, on a precision tool lathe. The metering tube is a push fit in a steel mounting tube 5 to 10 mm long, of internal diameter equal to the external diameter of the metering tube, and of external diameter equal to that of the low end of the glass tube of the separating funnel. The upper ends of the metering tube and of the mounting tube shall be in the same plane. The mounting tube is fixed by means of a short length of thick rubber tube (vacuum tubing) so that the upper end of the mounting tube is in contact with the lower end of the glass tube.
7 SAMPLING The laboratory sample of surface active agent shall be prepared and stored by the procedures specified in ISO 607. 8 PREPARATION OF THE TEST SOLUTION Prepare, from the laboratory sample, a solution of the material at its working strength. The water used for dilution may be either distilled water saturated with air by bubbling, or hard water containing 6 meq of calcium(I) ions per litre (see ISO 2174). Prepare the solution by pasting and then dissolution in the water chosen, previously warmed to 50 C. It is necessary to mix very gently to prevent the formation of foam. Keep the solution at 50土2 °c without stirring, until the test is made. The age of the solution, at the time of the measurement, shall be not less than 30 min and not greater than 2 h. Other conditions than those specified above (for example, hardness of the water, temperature) may be chosen provided that they are mentioned in the test report.

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