In glass mortar compounding of a suspension, preservatives should be added at which stage?

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Multiple Choice

In glass mortar compounding of a suspension, preservatives should be added at which stage?

Explanation:
Uniform distribution of preservative in aqueous suspensions is essential to prevent microbial growth, so you add it at the start of formulation. By incorporating the preservative with the vehicle before mixing the powders and grinding, it becomes part of the entire mass as the suspension is formed, ensuring consistent protection throughout the product and stability over time. If you wait until after final dilution, the preservative may not reach all portions, creating zones without adequate preservation and increasing contamination risk. Therefore, the preservative should be included at the beginning of the formulation.

Uniform distribution of preservative in aqueous suspensions is essential to prevent microbial growth, so you add it at the start of formulation. By incorporating the preservative with the vehicle before mixing the powders and grinding, it becomes part of the entire mass as the suspension is formed, ensuring consistent protection throughout the product and stability over time. If you wait until after final dilution, the preservative may not reach all portions, creating zones without adequate preservation and increasing contamination risk. Therefore, the preservative should be included at the beginning of the formulation.

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