Optimising Coating Uniformity in Oral Solid Dosage Manufacturing using High-Volatility Solvents

In the pharmaceutical manufacturing continuum, achieving coating uniformity in oral solid dosage forms is a critical quality attribute, directly impacting dissolution performance, product stability, and patient compliance. Precision coating is often governed by solvent behaviour, polymer dispersion efficiency, evaporation kinetics, and process control frameworks that support reproducibility under stringent regulatory oversight.

Solvents with high volatility and superior solvency characteristics play an instrumental role in enabling homogeneous film formation. Acetone, in particular, demonstrates strong polymer dissolution capabilities, supporting uniform distribution of coating excipients, plasticisers, and film-forming agents. This ensures optimal spray application, minimised defect rates, and structurally consistent coating mass deposition across tablet and capsule surfaces.

One of acetone’s defining advantages is its rapid evaporation profile, which supports efficient drying without inducing core surface stress, moisture entrapment, or uneven film curing. This volatility facilitates controlled film solidification, reducing streaking, picking, colour inconsistency, and surface roughness that may otherwise compromise coating integrity or trigger non-conformance during batch validation audits.

From a process governance standpoint, acetone’s low boiling point enables manufacturers to standardise spray rates, inlet air temperature, pan rotation speed, and airflow parameters with increased predictability. This directly reduces batch-to-batch variability, a key consideration under Quality by Design (QbD) principles. Moreover, solvent evaporation stability supports improved coating adhesion strength, film elasticity, and controlled thickness, all of which contribute to regulatory defensibility in pharmacopeial manufacturing submissions.

Advanced process analytical technologies (PAT) further support real-time monitoring of solvent vapour concentrations, coating mass gain, spray distribution efficiency, and drying uniformity metrics. These validation systems enhance traceability, enforce documentation integrity, and mitigate contamination risks, strengthening compliance with GMP, ISO 14644, and occupational safety benchmarks governing controlled manufacturing environments.

From a commercial perspective, acetone also supports scalable manufacturing, enabling reduced drying time, increased throughput, and improved energy efficiency in solvent removal systems. These efficiencies contribute to cost optimisation, reduced operational bottlenecks, and sustained process integrity across high-volume pharmaceutical coating lines.

Ultimately, acetone’s role underscores the importance of solvent reliability in pharmaceutical coating operations. Its unique chemical characteristics support uniformity, process discipline, regulatory alignment, and operational scalability, all while reinforcing product quality outcomes in environments where contamination control and batch consistency remain legally and commercially non-negotiable.


Source - https://purosolv.com/the-role-of-acetone-in-coating-uniformity-of-oral-solid-dosage-forms/


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