Standard Operating Procedure for Conducting Process Capability Studies for Gels in Gel Manufacturing
| Department | Gel Manufacturing |
|---|---|
| SOP No. | SOP/GM/112/2025 |
| Supersedes | SOP/GM/112/2022 |
| Page No. | Page 1 of 12 |
| Issue Date | 02/06/2025 |
| Effective Date | 04/06/2025 |
| Review Date | 02/06/2027 |
1. Purpose
To outline the procedure for conducting process capability studies in gel manufacturing to evaluate whether a process can consistently produce gel products within specified limits.
2. Scope
This SOP applies to all new and existing gel manufacturing processes where process
capability needs to be established or verified for regulatory, development, or continuous improvement purposes.
3. Responsibilities
- Process Engineer: Conducts the capability study and prepares statistical data analysis.
- Production Team: Executes batches under normal manufacturing conditions and records operational data.
- Quality Control: Performs analytical testing of in-process and final samples.
- Quality Assurance: Reviews and approves final process capability reports.
4. Accountability
Manager – Manufacturing
5. Procedure
5.1 Study Preparation
- Select the product and process step to be studied.
- Identify critical process parameters (CPPs) and critical quality attributes (CQAs).
- Develop a capability study protocol including data collection methodology, frequency, sample size, and statistical analysis techniques.
5.2 Data Collection
- Execute a minimum of 20-30 production runs or units to generate adequate data points.
- Ensure consistent operation during data collection without intentional variation.
- Record all values for the selected parameter (e.g., viscosity, pH, fill volume, etc.).
5.3 Statistical Analysis
- Calculate the process capability index (Cp) and process performance index (Cpk).
- Use statistical software or validated spreadsheets for calculations.
- Interpret results:
- If Cp and Cpk > 1.33: Process is capable.
- If Cp or Cpk < 1.0: Process is not capable and requires improvement.
5.4 Documentation
- Prepare a process capability report including objective, method, data tables, graphs (histograms, control charts), Cp/Cpk values, and conclusions.
- Attach all raw data sheets and calculations as annexures.
- Submit the report to QA for review and approval.
5.5 Review and Actions
- For non-capable processes, initiate root cause analysis and corrective actions.
- Update SOPs or parameters if required based on study outcomes.
6. Abbreviations
- CPP: Critical Process Parameter
- CQA: Critical Quality Attribute
- Cp: Process Capability Index
- Cpk: Process Performance Index
- QA: Quality Assurance
7. Documents
- Process Capability Study Protocol – Annexure-1
- Process Capability Report – Annexure-2
- Raw Data Sheets – Annexure-3
8. References
- ICH Q10: Pharmaceutical Quality System
- FDA Guidance on Process Validation
- ISO 22514-1: Statistical Methods in Process Capability
9. SOP Version
Version: 2.0
10. Approval Section
| Prepared By | Checked By | Approved By | |
|---|---|---|---|
| Signature | |||
| Date | |||
| Name | |||
| Designation | Jr. Production Chemist | QA Executive | Head – Manufacturing |
| Department | Gel Manufacturing | Quality Assurance | Manufacturing |
11. Annexures
Annexure-1: Process Capability Study Protocol
| Study Title | Process Capability Study of [Parameter] |
|---|---|
| Objective | |
| Batch Numbers | |
| Sampling Plan | |
| Statistical Tools | |
| Acceptance Criteria | Cp and Cpk ≥ 1.33 |
Annexure-2: Process Capability Report
| Report Title | Process Capability Report for [Product/Parameter] |
|---|---|
| Tested Parameter | |
| Mean | |
| Standard Deviation | |
| Cp | |
| Cpk | |
| Conclusion |
Annexure-3: Raw Data Sheet
| Sample No. | Test Result | Comments |
|---|---|---|
Revision History
| Revision Date | Revision No. | Change Description | Reason | Approved By |
|---|---|---|---|---|
| 15/04/2022 | 1.0 | Initial version | New SOP | QA Head |
| 02/06/2025 | 2.0 | Added ISO standard reference and updated annexures | Regulatory alignment | QA Head |