Quality Assurance

Static pass box

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Static pass box:

A static pass box, also known as a static transfer hatch or a cleanroom pass-through, is a specialized equipment used in cleanroom environments to facilitate the transfer of materials between different areas while minimizing the risk of contamination. It provides a controlled and isolated transfer point for items to pass through a cleanroom wall or barrier without compromising the cleanroom’s cleanliness levels.

Here are some key features and functions of a static pass box:

  1. Construction and Design: A static pass box is typically constructed using materials that are compatible with cleanroom requirements, such as stainless steel or powder-coated steel. It is designed with smooth, sealed surfaces to minimize particle generation and facilitate easy cleaning. The pass box may have double doors on opposite sides, with interlocking mechanisms to prevent both doors from being open simultaneously.
  2. Cleanroom Compatibility: Static pass boxes are designed to meet the cleanliness and air quality requirements of cleanroom environments. They often incorporate HEPA or ULPA filters to remove particles and airborne contaminants from the air passing through the pass box. The filters help maintain the desired cleanliness levels within the cleanroom during material transfer.
  3. Unidirectional Airflow: To maintain the cleanroom’s cleanliness, static pass boxes typically have a unidirectional airflow system. This ensures that air flows from the cleanroom side to the non-cleanroom side, preventing contamination from entering the cleanroom during material transfer.
  4. Mechanical Interlocking: Static pass boxes usually have a mechanical interlocking mechanism on the doors. This mechanism ensures that only one door can be opened at a time, creating an airlock to maintain the cleanroom’s pressure differentials and prevent cross-contamination.
  5. UV-C Germicidal Lighting: Some static pass boxes may be equipped with UV-C germicidal lighting. This feature helps sterilize the surfaces of items being transferred, reducing the risk of microbial contamination.
  6. Ease of Use: Static pass boxes are designed for ease of use and convenience. They often have user-friendly controls, such as touch panels or buttons, to operate the interlocking mechanism and control the airflow. The pass boxes may also have indicators or alarms to alert users if the doors are not properly closed or if the airflow is compromised.
  7. Size and Configuration: Static pass boxes are available in various sizes and configurations to accommodate different transfer needs. They can be wall-mounted, floor-mounted, or freestanding, depending on the specific cleanroom layout and requirements.

Static pass boxes play a critical role in maintaining the cleanliness and integrity of cleanroom environments during material transfer. They help prevent cross-contamination between different areas and ensure the controlled transfer of materials, tools, or equipment without compromising the cleanroom’s cleanliness levels.

Regular maintenance, filter replacements, and adherence to cleanroom protocols are essential for the effective operation of static pass boxes. It is important to follow proper procedures for cleaning and disinfection to prevent the buildup of particles or microbial contaminants.