The fusion method is typically used for ointments containing which of the following components?

The fusion method is typically used for ointments containing which of the following components?

• A. Aqueous solutions only
• B. Water-insoluble oils only
• C. Beeswax, paraffin, stearyl alcohol, and high MW PEG
• D. Gums and resins only

Answer: (C)

Fusion method relies on melting solid base ingredients to create a homogeneous ointment matrix. This approach works best when the base contains waxes or high-melting-point polymers that are solid at room temperature and must be melted to blend evenly. Beeswax, paraffin, stearyl alcohol, and high molecular weight PEGs fit this pattern because they melt and mix thoroughly when heated, producing a uniform, semisolid upon cooling. Aqueous solutions wouldn’t be compatible with this method, since water can’t be melted into the oil–fat matrix and would separate or evaporate during heating. Gums and resins generally aren’t melted to form a single uniform molten base; they are typically dispersed or dissolved with solvents or added by other methods rather than fused. Water-insoluble oils are liquids that don’t require fusion to blend, so they don’t define a fusion-based base on their own.

Fusion method relies on melting solid base ingredients to create a homogeneous ointment matrix. This approach works best when the base contains waxes or high-melting-point polymers that are solid at room temperature and must be melted to blend evenly. Beeswax, paraffin, stearyl alcohol, and high molecular weight PEGs fit this pattern because they melt and mix thoroughly when heated, producing a uniform, semisolid upon cooling.

Aqueous solutions wouldn’t be compatible with this method, since water can’t be melted into the oil–fat matrix and would separate or evaporate during heating. Gums and resins generally aren’t melted to form a single uniform molten base; they are typically dispersed or dissolved with solvents or added by other methods rather than fused. Water-insoluble oils are liquids that don’t require fusion to blend, so they don’t define a fusion-based base on their own.