What should be the material size range for using a soft china brush?

The size range of #50 to #200 is appropriate for using a soft china brush because this range typically involves finer aggregates. A soft china brush is designed to effectively handle fine materials without causing damage to the aggregate or altering its properties. In practice, it helps in cleaning and ensuring uniformity in the sample preparation process for finer materials, which are more susceptible to contamination and require a gentle approach for accurate testing.

Finer aggregates, such as those within the #50 to #200 range, can be more challenging to manage with more abrasive tools, which can alter the sample’s integrity. Therefore, using a soft china brush in this context allows for effective handling while minimizing the risk of compaction and maintaining the characteristics of the aggregate being tested.