Reducing contamination risk during new product line commissioning requires a structured, proactive approach that addresses contamination control before equipment is installed, personnel enter the space, or production begins. Commissioning phases are inherently high-risk: controlled environments are temporarily exposed to construction activity, new equipment, unfamiliar traffic patterns, and personnel who may not yet be fully trained in site-specific gowning and entry protocols. The sections below address the most critical questions facilities managers face when preparing a new line for compliant, contamination-controlled operation.
What contamination risks are unique to commissioning phases?
Commissioning phases introduce contamination risks that are rarely present during normal production. Construction debris, installation dust, uncertified personnel, new equipment surfaces, and incomplete gowning protocols all create elevated particulate and microbial exposure at a time when controlled environments are not yet fully validated. These risks are compounded by the temporary nature of commissioning activity, which often bypasses the established contamination control routines that govern day-to-day operations.
Unlike routine manufacturing, commissioning involves frequent movement of materials, tools, and people across zone boundaries that may not yet have defined entry control points. Equipment crating, cable routing, and mechanical installation generate particulate matter that can settle on surfaces and be redistributed through foot and wheel traffic. At the same time, commissioning teams often include contractors and engineers who are unfamiliar with the facility’s contamination control requirements, increasing the likelihood of protocol gaps at critical entry points.
Identifying these risks early and mapping them against the facility’s controlled zone layout is essential. A contamination risk assessment conducted at the start of commissioning should define which areas require the highest level of entry control, where temporary barriers or matting systems are needed, and how personnel flow will be managed before permanent infrastructure is in place.
How does foot and wheel traffic spread contamination during commissioning?
Foot and wheel traffic are the primary vectors for contamination spread during commissioning. Research consistently shows that up to 80% of contaminants enter controlled environments at floor level, carried in on footwear and the wheels of trolleys, pallet trucks, and equipment dollies. During commissioning, this risk is amplified because traffic volumes are higher, routes are less defined, and the personnel involved are frequently moving between uncontrolled and controlled zones.
Every time a technician walks from a corridor into a cleanroom entrance or a contractor wheels equipment from a loading area into a gowning room, they carry particulate matter with them. Without effective entry-point controls, these particles are tracked progressively deeper into the controlled environment with each pass. Commissioning activity typically generates more wheel traffic than routine production, as large equipment is moved into position, utilities are connected, and materials are transported across the facility.
Wheel contamination is particularly significant because wheeled equipment covers more floor area per journey and can carry larger particulate loads than foot traffic alone. Forklifts and pallet trucks operating in adjacent uncontrolled areas and then entering commissioning zones without decontamination at transition points represent a meaningful and often underestimated contamination pathway.
What contamination control measures should be in place before commissioning begins?
Before commissioning begins, facilities should have defined entry control points, personnel training protocols, and physical contamination barriers installed at all zone transitions. Waiting until commissioning is underway to address these measures increases both the contamination risk and the cost of remediation. Proactive planning ensures that controlled areas are protected from the first day of activity.
The following measures should be in place prior to any commissioning activity in or adjacent to controlled zones:
- Zone boundary definition: Clearly mark and physically separate controlled zones from construction and installation areas, with signage and physical barriers at transition points.
- Entry control infrastructure: Install contamination control matting at all pedestrian and wheeled entry points before personnel begin accessing the controlled area.
- Personnel briefing: Ensure all commissioning personnel, including contractors, are briefed on gowning requirements, entry protocols, and the contamination risks associated with their activity.
- Traffic flow mapping: Define approved routes for personnel and wheeled equipment, minimising crossover between uncontrolled and controlled zones.
- Cleaning schedule: Establish a commissioning-phase cleaning regime that accounts for the elevated particulate load generated by installation activity.
Facilities that treat contamination control as a commissioning deliverable, rather than an afterthought, are significantly better positioned for a smooth transition to validated production.
How do reusable contamination control mats compare to disposable sticky mats during commissioning?
Reusable contamination control mats offer a more reliable, cost-effective, and sustainable solution than disposable sticky mats during commissioning, particularly given the high traffic volumes and extended timelines involved. Disposable sticky mats lose adhesion quickly under heavy use, require frequent replacement, and generate considerable single-use plastic waste, making them poorly suited to the demands of an active commissioning phase.
During commissioning, entry points are used intensively by personnel and wheeled equipment over weeks or months. Disposable sticky mats become saturated and ineffective within hours under this level of traffic, and their per-sheet replacement cost accumulates rapidly across a commissioning programme. The operational disruption of constant mat replacement also creates windows where entry points are temporarily unprotected.
Reusable polymeric mats, by contrast, are engineered to capture and retain particulate under sustained, heavy use. Dycem’s contamination control mats are designed to perform for three to five years, making them a practical fit for commissioning phases where durability and consistency matter. Built-in Biomaster silver-ion antimicrobial technology inhibits microbial growth by up to 99.9%, providing an additional layer of protection during a period when microbial risk is elevated. From a sustainability perspective, reusable mats significantly reduce single-use plastic waste compared to peel-off alternatives, supporting facilities with ESG commitments and waste reduction targets.
How do contamination control requirements affect GMP and ISO audit readiness during commissioning?
GMP and ISO audit readiness during commissioning depends on demonstrating that contamination control measures were implemented systematically from the outset, not retrofitted after the fact. Regulatory frameworks including EU GMP Annex 1, FDA guidance, and ISO 14644 require that controlled environments maintain defined cleanliness standards throughout their lifecycle, including during qualification and commissioning phases. Auditors expect to see documented evidence of contamination control measures, not just their physical presence.
During commissioning, the audit trail begins. Facilities that can demonstrate a structured contamination control plan, supported by records of entry point management, personnel training, and cleaning activity, are better positioned when qualification documentation is reviewed. Gaps in contamination control during commissioning can raise questions about the integrity of the validation process and the reliability of the controlled environment once production begins.
ISO 14644-compliant facilities must also demonstrate that particulate levels are controlled throughout the commissioning process, as baseline cleanliness data gathered during this phase informs the facility’s ongoing monitoring programme. Contamination events during commissioning can skew baseline data and complicate the qualification timeline. Consistent, validated entry-point control from day one of commissioning activity is therefore not just a best practice; it is a prerequisite for audit-ready qualification documentation.
When should contamination control systems be validated after commissioning?
Contamination control systems should be validated as part of the facility qualification process, typically during the Operational Qualification (OQ) or Performance Qualification (PQ) phase, after commissioning is complete and before routine production begins. Validation should confirm that contamination control measures perform as intended under realistic operating conditions, including the traffic patterns and entry point usage that will characterise normal production.
Validation of contamination control systems involves verifying that particulate capture at entry points meets the cleanliness requirements of the controlled zone, that antimicrobial properties are functioning as specified, and that the matting system can be cleaned and maintained without compromising performance. Where reusable mats are in use, validation should also confirm that the cleaning protocol restores the mat’s capture performance between cleaning cycles.
Post-commissioning validation should not be treated as a one-time activity. Contamination control systems require periodic revalidation, particularly following significant changes to facility layout, traffic volumes, or entry point configuration. Establishing a revalidation schedule as part of the facility’s change control process ensures that contamination control performance remains demonstrable throughout the product line’s operational life.
How Dycem helps reduce contamination risk during new product line commissioning
Dycem provides purpose-built contamination control solutions that address the specific challenges of commissioning phases, from initial entry point protection through to validated, long-term performance in production environments. Key benefits include:
- High-performance particulate capture: Dycem mats capture and retain up to 99.9% of particles at the point of entry, protecting controlled zones from the first day of commissioning activity.
- Built-in antimicrobial protection: Biomaster silver-ion technology inhibits microbial growth by up to 99.9%, providing consistent protection during high-risk commissioning periods.
- Durability under heavy commissioning traffic: Designed for three to five years of performance, Dycem mats withstand the elevated foot and wheel traffic typical of commissioning phases without losing effectiveness.
- Flexible formats for temporary and permanent zones: Dycem CleanZone mats protect pedestrian and light-wheeled entry points such as gowning rooms and airlocks, while WorkZone mats handle heavy-wheeled traffic including forklifts and pallet trucks. Floating Mats offer repositionable coverage for temporary zones that shift as commissioning progresses.
- ISO-certified quality: Manufacturing to EN ISO 9001 and 14001 standards supports audit-ready documentation and regulatory compliance from commissioning through to production.
To discuss your commissioning requirements and arrange a free site survey, speak to a Dycem specialist today.