The question is about identifying the process used in pharmaceutics when a lubricant is finely divided using a nylon cloth with mesh size 60-100. We are provided with four options, and we need to select the correct one based on understanding the process involved.
Let's analyze the options one by one:
- Bolting: This is a process commonly used in pharmaceutics for sieving or separating fine particles through a sieve or cloth. In this context, bolting refers to passing the lubricant through a mesh cloth to ensure fine division and even distribution over the granulation. This matches the description given in the question.
- Mixing: This involves combining two or more substances to achieve homogeneity. While mixing is a crucial step, it does not specifically address the sieving process described.
- Tumbling: Tumbling is used to mix or coat materials by rotating them in a tumbling drum. Similar to mixing, it does not specifically involve passing through a mesh cloth.
- Grinding: This is the process of reducing particle size by mechanical means. Although it involves size reduction, it is not the correct term for the process of passing a material through a mesh cloth.
Based on the analysis, the correct answer is Bolting because it precisely describes the process of using a mesh to achieve fine separation and distribution of the lubricant onto granulation. This makes sure that the particles are uniform in size, which is critical for pharmaceutical applications.