SOP for stability chamber at 40°C and 75% RH

SOP for stability chamber

Shahzaib Aftab

Complete SOP for stability chamber at 40°C and 75% RH. Covers operation, calibration, cleaning, and compliance for stability studies.

Definition

A control environment chamber SOP is a documented procedure that ensures a stability chamber consistently maintains specified conditions (40°C and 75% RH) for pharmaceutical stability testing, ensuring product quality, safety, and regulatory compliance.

Introduction

In pharmaceutical quality control, maintaining precise environmental conditions is critical for stability studies. A control environment chamber ensures that samples are stored under controlled temperature and humidity conditions—typically 40°C and 75% RH, as per ICH guidelines.

This SOP provides a structured, compliant, and easy-to-follow procedure for operation, calibration, and cleaning of the chamber. Proper adherence minimizes variability, ensures data integrity, and supports regulatory inspections.

1.0 OBJECTIVE

To ensure that the humidity chamber performs satisfactorily and maintains required temperature and relative humidity for stability study samples.

2.0 SCOPE

Applicable to all humidity chambers used for maintaining 40°C ± 2°C and 75% ± 5% RH for stability studies.

3.0 RESPONSIBILITY

Microbiologist – Quality Control

4.0 ACCOUNTABILITY

Manager – Quality Control

5.0 PROCEDURE

5.1 General Cleaning

  • Switch OFF the power supply.
  • Clean external surfaces with a dry cloth.
  • Perform weekly wet cleaning using detergent solution.
  • Remove detergent residue with a dry cloth.
  • Clean interior surfaces monthly with a dry cloth.

5.2 Operating

  • Ensure proper power connection.
  • Check water supply availability.
  • Switch ON main and chamber power.
  • Set temperature to 40°C using control panel.
  • Set humidity to 75% RH using control panel.
  • Ensure thermohygro sensor is clean and functional.
  • Record temperature and humidity daily.
  • If deviation exceeds limits:
    • Notify QA and Engineering.
    • Label chamber as “Out of Order”.
    • Transfer samples within 2 hours.

Step-by-Step Quick SOP

  1. Check power and water supply
  2. Switch ON the chamber
  3. Set temperature to 40°C
  4. Set humidity to 75% RH
  5. Verify sensor condition
  6. Record daily readings
  7. Handle deviations immediately

Calibration

  • Perform calibration using certified reference instruments.
  • Frequency: Quarterly or as per schedule
  • Verify:
    • Temperature uniformity
    • Humidity accuracy
  • Document calibration results.
  • Label equipment with calibration status.

Cleaning

  • External cleaning: Daily/weekly
  • Internal cleaning: Monthly
  • Use non-corrosive detergent
  • Avoid water entry into electrical components
  • Maintain cleaning log records

Abbreviations

  • SOP – Standard Operating Procedure
  • RH – Relative Humidity
  • QC – Quality Control
  • QA – Quality Assurance

FAQs

1. What is a control environment chamber?

A chamber used to maintain controlled temperature and humidity for stability testing.

2. Why is 40°C and 75% RH used?

It simulates accelerated stability conditions as per ICH guidelines.

3. How often should calibration be done?

Typically quarterly or as per SOP.

4. What happens if conditions deviate?

Samples must be transferred and deviation reported immediately.

5. Who is responsible for the chamber?

Quality Control personnel.

6. How often should cleaning be performed?

External weekly, internal monthly.

7. What is acceptable humidity variation?

±5% RH.

8. What is acceptable temperature variation?

±2°C.

9. Why is daily monitoring important?

Ensures data integrity and compliance.

10. What is SOP in pharma?

A documented procedure to ensure consistency and compliance.

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