Cross Over Bench: An Essential Component in Contamination Control

What is a Cross Over Bench?

A cross over bench is a stainless steel bench with smooth surfaces, strategically placed at the entrance to controlled environments, cleanrooms, or critical zones. It acts as a physical barrier between uncontrolled and controlled areas. The term “cross over” signifies that personnel must cross the bench without their feet touching it. This precaution prevents dust and microbial contamination, as footwear is a significant carrier of particles.

Cross over benches can be either fixed or removable, depending on facility layout and flexibility requirements. They are designed with rounded edges for easy cleaning and feature non-porous surfaces to prevent particle accumulation. Regular cleaning with 70% isopropyl alcohol (IPA) or sterile disinfectants, along with periodic inspections, ensures their effectiveness.

Why Use a Cross Over Bench?

According to Good Manufacturing Practice (GMP), preventing contamination is crucial in the pharmaceutical industry. The cross over bench plays a vital role in maintaining hygiene and controlling contamination.

Key Benefits:

Footwear Changing: Provides a designated space for personnel to switch from outdoor shoes to cleanroom shoes.
Traffic Flow Management: Organizes movement within the facility, ensuring adherence to cleanliness protocols.
Prevention of Cross-Contamination: Reduces the risk of contamination when moving from a lower cleanliness area to a higher cleanliness area.
Demarcation of Zones: Clearly separates controlled (classified) and uncontrolled (non-classified) areas.
Promotion of Personnel Hygiene: Encourages adherence to hygiene practices in sensitive environments.
Minimization of Particulate Contamination: Essential in aseptic manufacturing and cleanroom operations.
Storage Facility: Equipped with built-in compartments for storing outdoor footwear.

General Procedures for Using a Cross Over Bench

To ensure effective use of a cross over bench, personnel must follow these steps:

Remove outdoor shoes and socks before entering the controlled area.
Wear designated footwear for use inside the premises.
Remove loose accessories, such as jewelry and watches.
Sanitize hands using an appropriate disinfectant.
Place outdoor shoes on the designated side of the bench (non-classified area).
Step over the bench carefully without touching it.
Put on cleanroom footwear or dedicated production shoes stored in the clean area.
Ensure feet do not touch the opposite zone’s ground before wearing the correct footwear.
Wear shoe covers if required.

Conclusion

A cross over bench is an essential tool in contamination control, particularly in pharmaceutical, healthcare, and cleanroom environments. By implementing strict procedures and ensuring regular maintenance, facilities can significantly reduce contamination risks, enhance hygiene practices, and comply with GMP standards.