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stearic acid lubricant is one of the most popular natural lubricants and is often found in soaps, cleaners, lotions and hair care products. It can help cleanse your skin of excess oil and impurities and can even act as a degreaser, due to its emulsifying effects on oils/lipids.
It can also be a great addition to DIY bath and body recipes. It can be mixed with water, oils and emulsifiers to create a stable and smooth product.
In the medical industry, stearic acid is often used to emulsify and solubilize dry powdered ingredients that are contained in tablets or capsules. This helps ensure that the capsules/tablets don’t break apart and that ingredients remain in place, which is important when taking oral medications.
There are many different types of stearic acid lubricants, but magnesium stearate is often the most common type. It has a long history of use in pharmaceuticals and is known for its excellent lubrication properties.
Choosing the right lubricant is critical for a formulation’s performance, as it can have a significant impact on the drug product’s dissolution, stability and bioavailability. When evaluating the performance of different lubricants, a number of factors must be considered, including the lubricant’s viscosity and friction reduction properties, compatibility with the API, and the mixing time for distributing the lubricant throughout the blend.
In general, the lubrication of APIs in tablet form is highly dependent on the particle size and size distribution. Small particles (fines) of APIs often have a negative effect on flow, so incorporating a lubricant as a flow agent can help improve powder flow and reduce friction through modified particle-particle contact.