CPPs are defined in accordance with applicable regulatory guidelines and that validation activities meet regulatory requirements.

4. Accountability

The Manufacturing Manager is accountable for ensuring that the critical process parameters are properly defined and validated according to this SOP. The overall compliance with this SOP is overseen by the Quality Assurance (QA) Manager.

5. Procedure

5.1. Identifying Critical Process Parameters (CPPs)

1. Critical process parameters are defined as variables that must be controlled during the manufacturing process to ensure the desired product quality and consistency. These parameters directly affect the product’s performance, stability, and safety.
2. To identify CPPs, the following process factors should be considered:
   • Formulation characteristics (e.g., ingredients, concentrations)
   • Equipment settings (e.g., filling speed, pressure, temperature)
   • Environmental conditions (e.g., humidity, temperature in the manufacturing area)
   • Packaging materials (e.g., type of can, actuator, valve)
   • Process steps (e.g., mixing, filling, crimping, pressurizing)
3. Consultation with production, engineering, and quality assurance teams should be carried out to identify and define the critical parameters.
4. Each identified CPP should have a defined acceptable range (e.g., temperature range, filling volume range) within which the product must remain to ensure quality standards are met.

5.2. Defining Critical Process Parameters

1. Once potential CPPs are identified, each parameter should be evaluated for its impact on the product. The evaluation should consider:
   • Impact on the final product’s quality attributes (e.g., chemical stability, appearance, spray rate)
   • Impact on the reproducibility and consistency of the process
   • Impact on regulatory compliance and product safety
2. CPPs should be clearly defined with measurable parameters, including acceptable ranges, tolerances, and limits. For example:
   • Filling volume: Acceptable range: 0.5 mL ± 0.1 mL
   • Pressure during propellant filling: Acceptable range: 1.5 MPa ± 0.2 MPa
3. Once defined, these CPPs should be documented and reviewed by the QA team and regulatory affairs to ensure alignment with the product’s specifications and regulatory requirements.

5.3. Controlling Critical Process Parameters

1. Once the CPPs have been identified and defined, the next step is to implement control mechanisms to monitor and maintain these parameters during production. Control mechanisms may include:
   • Automated control systems that monitor and adjust parameters in real-time (e.g., temperature control, pressure sensors)
   • Manual monitoring and adjustment procedures for parameters that cannot be automatically controlled (e.g., visual inspection for valve crimping)
   • Regular calibration and maintenance of equipment used to monitor or control CPPs
2. Control procedures should be documented and incorporated into the Standard Operating Procedures (SOPs) for each manufacturing process step.

5.4. Monitoring and Recording Critical Process Parameters

1. During production, critical process parameters should be monitored and recorded. This can be done through automated systems or manual recordings, depending on the process and equipment in use.
2. The following data should be recorded for each CPP:
   • Measured value for each parameter
   • Time and date of measurement
   • Operator or system ID performing the monitoring
   • Any corrective actions taken if a parameter is found outside the acceptable range
3. Records of CPP monitoring should be stored securely and made available for internal audits and regulatory reviews.

5.5. Validating Critical Process Parameters

1. Once CPPs are identified, defined, and controlled, they must be validated to ensure they consistently produce the desired product quality. Validation should include:
   • Running production trials with the controlled CPPs to confirm that the product meets all quality specifications
   • Performing quality control testing on the final product (e.g., appearance, chemical composition, spray rate) to verify that it meets the requirements
   • Documenting validation results in the Process Validation Report (Annexure-1)
2. The QA team should review and approve the validation results to confirm that the CPPs are capable of consistently producing high-quality aerosol products.

5.6. Ongoing Monitoring and Requalification of CPPs

1. Critical process parameters must be continuously monitored during routine production. If any deviations are observed, corrective actions must be taken and documented in the Deviation Log (Annexure-2).
2. If any changes occur in the manufacturing process (e.g., equipment upgrades, formulation changes), the affected CPPs should be re-evaluated and re-qualified to ensure continued compliance with quality standards.
3. Periodic reviews of CPPs should be conducted to ensure that the parameters remain relevant and effective in maintaining product quality.

6. Abbreviations

• GMP: Good Manufacturing Practice
• QA: Quality Assurance
• SOP: Standard Operating Procedure
• CPP: Critical Process Parameter
• OQ: Operational Qualification
• PQ: Performance Qualification
• CFR: Code of Federal Regulations

7. Documents

1. Process Validation Report (Annexure-1)
2. Deviation Log (Annexure-2)

8. References

This SOP is based on the following regulatory guidelines and industry standards:

• Good Manufacturing Practice (GMP) Guidelines
• FDA Code of Federal Regulations (CFR) Title 21, Part 211
• International Council for Harmonisation (ICH) Guidelines

9. SOP Version

Version: 2.0

10. Approval Section

	Prepared By	Checked By	Approved By
Signature
Date
Name
Designation
Department

11. Annexures

Annexure-1: Process Validation Report

Batch Number	Validation Date	Result	Remarks
Batch-001	10/02/2025	Pass	All CPPs within acceptable range

Annexure-2: Deviation Log

Deviation ID	Deviation Description	Corrective Action	Responsible Person	Status
DEV-12345	Pressure fluctuation during filling	Adjusted equipment settings	Rajesh Patel	Completed

12. Revision History:

Revision Date	Revision No.	Revision Details	Reason for Revision	Approved By	Page No.	Ref. Point No.	Details of Revision
01/01/2024	V 1.0	Initial Release	First Issue	Anjali Sharma	Page 1	[Ref Point]	First Release
01/01/2025	V 2.0	Updated CPP identification and definition process	To comply with updated GMP regulations	Anjali Sharma	Page 1	[Ref Point]	Updated procedures