Spray suspension. Prepare a suspension consisting of (1.5 ± 0.05 g) of silica powder (silica micro-powder having a mean particle size of 24 μm) per litre of tap water in a container, stirring vigorously. The water temperature shall be between 15 °C and 30 °C. The suspension shall be stirred continuously during the test procedure in such a way that the silica powder does not settle on the bottom of the container.
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Samples: unece.org, www.unece.org, www.unece.org
