Supervisor: Responsible for overseeing the monitoring process and ensuring that deviations from the required mixing parameters are addressed promptly.

4. Accountability

The Production Manager is accountable for ensuring that batch mixing is conducted as per the defined parameters. The QC Manager is accountable for monitoring the process and reviewing the recorded data. The Laboratory Supervisor ensures that any deviations are addressed promptly.

5. Procedure

5.1 Pre-Mixing Preparations

1. Review the batch manufacturing record (BMR) for the product to be mixed, including the required batch size, formulation, and mixing parameters.
2. Ensure that the correct ingredients are available and properly weighed, according to the specifications in the BMR.
3. Verify that the mixing equipment (e.g., mixers, tanks, etc.) is clean, calibrated, and functioning correctly before use.
4. Ensure that all necessary equipment, including thermometers, viscometers, and timers, are calibrated and available for monitoring purposes.

5.2 Monitoring Mixing Parameters

1. Mixing Time: Monitor the mixing time to ensure it falls within the specified range. Use a stopwatch or automated system to track mixing time, as specified in the BMR.
2. Mixing Speed: Monitor the mixing speed to ensure it stays within the required range. Check the mixing speed at regular intervals using a tachometer or an automated system.
3. Temperature: Measure and record the temperature of the mixture regularly to ensure it remains within the specified range. Use a calibrated thermometer or temperature sensor.
4. Viscosity: Monitor the viscosity of the mixture at specified intervals using a viscometer. Record the results and ensure that the viscosity remains within the desired range as defined in the product specifications.
5. Ensure that the mixing parameters are continuously monitored, and any deviations are recorded in the Batch Mixing Parameters Log (Annexure-1).

5.3 Handling Deviations

1. If any of the monitored parameters (time, speed, temperature, or viscosity) fall outside the specified range, immediately stop the mixing process.
2. Investigate the cause of the deviation and implement corrective actions as necessary. This may include adjusting the equipment settings, adding additional ingredients, or reworking the mixture.
3. Document the deviation in the Deviation Report (Annexure-2), including the cause, corrective action taken, and any impact on the final product quality.
4. If the deviation cannot be resolved, halt the batch and initiate a rework or rejection process in coordination with the QA team.

5.4 Post-Mixing Activities

1. Once the mixing process is complete, ensure that the batch is transferred to the next stage of production (e.g., emulsification, filling) according to the BMR.
2. Ensure that all equipment used in the mixing process is cleaned and sanitized according to the Cleaning and Sanitization SOP (SOP/CRM/005/2025).
3. Verify that all monitoring data (e.g., temperature, viscosity, mixing time, speed) is recorded accurately in the Batch Mixing Parameters Log (Annexure-1).

5.5 Documentation and Record-Keeping

1. Document all monitored parameters, including any deviations and corrective actions, in the Batch Mixing Parameters Log (Annexure-1).
2. Ensure that all records are signed by the operator performing the mixing and reviewed by the Laboratory Supervisor or Quality Control personnel.
3. Ensure that all records are retained for a minimum of two years or as required by regulatory guidelines.
4. Store all documentation securely for easy retrieval during audits or regulatory inspections.

6. Abbreviations

• GMP: Good Manufacturing Practices
• QC: Quality Control
• QA: Quality Assurance
• BMR: Batch Manufacturing Record
• PPE: Personal Protective Equipment

7. Documents

1. Annexure-1: Batch Mixing Parameters Log
2. Annexure-2: Deviation Report

8. References

• Good Manufacturing Practices (GMP) Guidelines – 21 CFR Part 211
• International Conference on Harmonisation (ICH) Q7 – Good Manufacturing Practice for Active Pharmaceutical Ingredients
• FDA Guidance for Industry: Batch Mixing Procedures in Pharmaceutical Manufacturing

9. SOP Version

Version: 2.0

10. Approval Section

	Prepared By	Checked By	Approved By
Signature
Date
Name
Designation
Department

11. Annexures

Annexure-1: Batch Mixing Parameters Log

Batch Number	Mixing Time	Mixing Speed	Temperature	Viscosity	Operator	Remarks
12345	30 minutes	100 rpm	23°C	85 cP	John Doe	No deviations

Annexure-2: Deviation Report

Batch Number	Deviation Description	Corrective Action	Resolved By
12345	Viscosity exceeded limit	Adjusted mixing speed	Jane Smith

Revision History:

Revision Date	Revision No.	Revision Details	Reason for Revision	Approved By
01/03/2024	1.0	Initial Version	New SOP Creation	QA Head
01/03/2025	2.0	Format Revision and Updates	Standardization of Document	QA Head