Standard Operating Procedure for Bulk Storage of Gel Formulations
| Department | Gel Manufacturing |
|---|---|
| SOP No. | SOP/GM/038/2025 |
| Supersedes | SOP/GM/038/2022 |
| Page No. | Page 1 of 10 |
| Issue Date | 02/06/2025 |
| Effective Date | 04/06/2025 |
| Review Date | 02/06/2026 |
1. Purpose
To define the standardized procedure for bulk storage of gel formulations after manufacturing and prior to final packaging, ensuring product stability, traceability, and compliance with quality standards.
2. Scope
This procedure applies to all bulk gel batches produced in the Gel Manufacturing Department and stored prior to filling and packaging activities.
3. Responsibilities
- Production Operator: Responsible for
transferring the gel to the bulk storage vessel and recording batch details.
Quality Assurance: To verify the identity, integrity, and compliance of the bulk gel storage conditions.
Warehouse Personnel: Responsible for maintenance of storage rooms and bulk gel labels.
4. Accountability
The Head – Manufacturing is accountable for ensuring adherence to this SOP and monitoring the storage operations.
5. Procedure
5.1 Preparation for Storage
- Ensure the gel formulation has passed all in-process and intermediate testing.
- Verify the cleanliness and readiness of the designated bulk storage vessel.
- Label the bulk storage vessel with the product name, batch number, manufacturing date, and status tag (“Approved for Storage”).
5.2 Storage Environment Requirements
- Store gels in stainless steel containers with appropriate lids or pressure-tight covers.
- Maintain room temperature as per product-specific requirements (generally 20°C–25°C unless otherwise specified).
- Control relative humidity (RH) to within permissible range (typically <65%).
- Monitor and record temperature and humidity twice per shift using calibrated devices.
5.3 Bulk Storage Duration
- Do not store bulk gel batches for more than 7 days unless stability data supports extended hold time.
- If exceeding hold time, initiate deviation and risk assessment per QA approval.
5.4 Sampling and Retesting
- Take retention samples on day 0 of storage and after 5 days if hold time exceeds 3 days.
- Perform pH, appearance, viscosity, and microbial testing as applicable.
- Document results in the Bulk Retesting Report – Annexure-1.
5.5 Re-Homogenization Before Use
- Mix the bulk gel using a low-speed stirrer to restore homogeneity before transferring to filling line.
- Conduct spot testing of pH and appearance post mixing.
5.6 Cleaning and Maintenance
- Clean the storage tanks and utensils as per SOP for Cleaning of Gel Storage Equipment.
- Verify cleaning status using visual inspection and swab sampling as required.
6. Abbreviations
- QA: Quality Assurance
- SOP: Standard Operating Procedure
- RH: Relative Humidity
7. Documents
- Bulk Storage Log – Annexure-1
- Bulk Retesting Report – Annexure-2
- Environmental Monitoring Log
8. References
- Schedule M – Storage Requirements for Pharmaceutical Products
- WHO TRS Guidelines on Hold Time Studies
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: Bulk Storage Log
Captures container number, product name, batch number, date/time of storage, and location details.
Annexure-2: Bulk Retesting Report
Includes appearance, pH, viscosity, microbial load, analyst initials, and QA disposition.
Revision History:
| Revision Date | Revision No. | Details | Reason | Approved By |
|---|---|---|---|---|
| 01/05/2022 | 1.0 | Initial SOP release | Standardization of storage practices | QA Head |
| 02/06/2025 | 2.0 | Added re-homogenization and sampling guidance | GMP enhancement | QA Head |