ASTM D3519 Standard Test Method for Foam in Aqueous Media (Blender Test)
5. Apparatus
5.1 Blender.
NOTE 2 - Tests with blenders other than commercial 7-speed Waring Blendor Model 5012G or Model 91-264 (7012G), as shown in Fig. 1, may be suspect due to differences in speed or shape of the jar. The blender speed should be calibrated by any reliable means. One means can be to use a hand-contact tachometer to get the order of speed and then to get several more precise determinations using a stroboscope (which does not touch the rotor). Settings then can be selected to obtain the recommended speed.
5.2 Water Bath, constant-temperature, suitable to hold blender jar and several bottled emulsions at 25 +/- 1°C (77 +/- 1.8°F) for 1 to 2 h.
5.3 Stop Watch or Timer, capable of measuring 5 min +/- 0.2 s.
5.4 Glass Jars or Bottles, clean or new, 250-ml (8-oz) or 500-ml (16-oz).
5.5 Graduated Cylinder, 250-ml, fitted with ground-glass stopper.
5.6 Rule, millimetre, approximately 300 mm long to be attached to the blender jar.
6. Materials
6.1 Distilled Water.
6.2 Hard Water, 20 000 ppm, made as follows: Dissolve 29.4 g of reagent grade (ACS standard) CaCl2·2H2O in 1 L of freshly boiled distilled water. (Used only where distilled water is used as in Note 3.)
