Maintaining Cleanroom Integrity: A Comprehensive SOP for Cleaning and Operating Static Pass Boxes

Contributing Author:   Meghana Chinta Submitted Date: 11 May 2008

A Static Pass Box is a critical component in cleanroom environments, helping maintain cleanliness and prevent contamination when transferring materials between areas with different cleanliness levels. Here's a Standard Operating Procedure (SOP) for the cleaning and operation of a Static Pass Box:

Standard Operating Procedure (SOP) for Cleaning and Operation of Static Pass Box

Objective: To establish guidelines for the proper cleaning and operation of a Static Pass Box to maintain cleanliness, minimize contamination risks, and ensure compliance with cleanroom standards.

Materials and Equipment:

1. Static Pass Box
2. Cleaning supplies (e.g., lint-free wipes, disinfectants, cleaning agents)
3. Personal protective equipment (PPE): Lab coat, safety goggles, gloves, and appropriate footwear
4. Logbook for recording cleaning and maintenance activities
5. First aid kit

Safety Precautions:

1. Always wear the appropriate PPE when cleaning and operating the Static Pass Box.
2. Follow cleanroom protocols and guidelines.
3. Be aware of potential contamination risks.

Cleaning Procedure:

1. Preparation:

   • Ensure that the Static Pass Box is powered off and disconnected from the cleanroom HVAC system.
   • Confirm that the pass box is not in use and no materials are inside.

2. Exterior Cleaning:

   • Clean the exterior surfaces of the Static Pass Box, including doors and frames, using lint-free wipes and a suitable cleaning agent.
   • Pay attention to areas with visible contamination or dust buildup.
   • Ensure that the exterior surfaces are free from dirt, fingerprints, or any other contaminants.

3. Interior Cleaning:

   • Open both doors of the Static Pass Box.
   • Clean the interior surfaces, including the shelves and walls, using lint-free wipes and a suitable cleaning agent.
   • Pay particular attention to the cleanliness of the interior to prevent cross-contamination.
   • Remove any residue or visible contaminants.

4. Disinfection:

   • Apply a suitable disinfectant to the interior surfaces as recommended by your cleanroom protocols.
   • Follow the manufacturer's instructions for contact time and concentration.
   • Allow sufficient contact time for effective disinfection.

5. Drying:

   • Allow the interior of the Static Pass Box to air dry or use lint-free wipes to dry it thoroughly.
   • Ensure that no cleaning or disinfectant residue remains.

Operation Procedure:

6. Power On:

   • Ensure that the Static Pass Box is connected to the cleanroom HVAC system.
   • Power on the Static Pass Box according to the manufacturer's instructions.
   • Verify that the pressure differential and airflows are within acceptable parameters.

7. Material Transfer:

   • Open one door of the Static Pass Box.
   • Place the materials to be transferred onto the shelf inside the pass box.
   • Close the first door.
   • Open the second door, allowing access from the opposite side.
   • Retrieve the materials from the shelf and transfer them to the cleanroom or adjacent area.

8. Airflow Control:

   • Ensure that the airflow through the Static Pass Box is maintained as per cleanroom specifications.
   • Monitor pressure differentials to prevent contamination from entering or exiting the cleanroom.

Maintenance and Documentation:

9. Record Keeping:
   • Maintain a logbook to record cleaning and maintenance activities, including dates, personnel involved, and any observations or issues.
   • Document any deviations or maintenance requirements.

Completion:

• Ensure that the cleaning and operation of the Static Pass Box are completed in accordance with this SOP.
• Regularly review and update this SOP to reflect changes in cleaning procedures or maintenance requirements.

Proper cleaning and operation of the Static Pass Box are essential for maintaining cleanliness and preventing contamination in cleanroom environments. Adhering to this SOP helps ensure the effectiveness and reliability of the Static Pass Box.

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