The Hidden Threat in Gownrooms
Gownrooms, often classified as ISO 8 or pharmaceutical Grade C/D zones, are designed as transitional spaces where operators don cleanroom garments before entering critical ISO 5 or Grade A/B areas. The assumption is that gowning protocols, combined with airlocks and pressure gradients, prevent contamination from lower-grade zones from reaching sensitive manufacturing areas. However, evidence from Foamtec’s PolyCHECK® FM identification studies reveals a critical flaw: cleanroom garments are not just passive barriers but active carriers of contamination.
In pharmaceutical and medical device cleanrooms, static attraction exacerbates the issue. Glass and plastic fibers, common in these environments due to packaging, equipment, or raw materials, cling to garments. These fibers, cellulose, and polyester particles shed from low-quality wipes used in gown rooms hitch a ride on operators, bypassing even the most stringent segregation measures.
The Problem: Low-End Wipers in Gownrooms
A common cost-saving practice in many facilities is using polyester-cellulose or non-abrasion-resistant wipes for cleaning gownroom surfaces, benches, and floors. These wipes may be economical but degrade under minimal friction, shedding cellulose and synthetic fibers. Engineers often assume that gowning procedures—such as donning garments in a controlled environment or passing through airlocks—neutralize this risk. Unfortunately, Foamtec’s FM analysis tells a different story.
Key Findings from PolyCHECK® FM Audits
In a recent audit using the PolyCHECK® FM Process, cleanroom garments and footwear from an operational fab were analyzed. The results were alarming:
- Widespread Fiber Contamination: Cellulose and polyester fibers were embedded in garment sleeves, legs, and boots, indicating contact with degrading wipes or contaminated surfaces.
- Human and Organic Residues: Garments carried organic residues and human contamination, suggesting gloves should be used during donning.
- Cross-Zone Transfer: Identical contaminants were found in low-grade (ISO 8) and high-grade (ISO 5) zones, proving that particles travel with operators into sensitive areas.
These findings debunk the myth that gownroom contamination stays confined. Instead, garments act as mobile carriers, transporting fibers and particles into aseptic and precision manufacturing zones, where they jeopardize product quality and yield.
Why Current Practices Fall Short
Cleanroom designs rely on physical barriers—pressure gradients, unidirectional airflow, and HEPA filtration—to maintain segregation. However, these measures are ineffective when contamination is attached to the garments operators wear. The static attraction of glass and plastic fibers, prevalent in medtech and pharma environments, compounds the problem, as these particles adhere tenaciously to fabrics. Even rigorous gowning protocols cannot dislodge embedded fibers, and air showers may not entirely remove them. As a result, contamination introduced in gown rooms consistently reappears in critical modules, undermining the integrity of cleanroom operations.
The Solution: Stop Contamination at the Source
To address this issue, facilities must rethink gownroom practices and adopt proactive measures to prevent contamination transfer. Foamtec offers two powerful tools to tackle this challenge:
1. PolyCHECK® FM Process
The PolyCHECK® FM Process is a scientific auditing tool that traces contamination to its source. By sampling garments, gloves, surfaces, and equipment, facilities can:
- Quantify the types and quantities of fibers and residues transferred from less controlled zones.
- Trace contamination pathways by comparing particle types across multiple cleanroom modules.
- Identify whether gowning protocols, cleaning methods, or material choices contribute to contamination failures.
This data-driven approach empowers engineers to pinpoint weaknesses in their contamination control strategies and implement targeted improvements.
2. MiraWIPE® Microfiber Wipers
Foamtec recommends replacing low-end polyester-cellulose wipes with MiraWIPE® microfiber wipers to eliminate fiber shedding in gown rooms. Unlike traditional wipes, MiraWIPE® offers:
- Abrasion Resistance: Withstands friction without shedding fibers.
- Solvent Compatibility: Leaves no residues, ensuring compatibility with cleaning agents.
- ISO 5+ Validation: Safe for use in gown rooms and transitions to critical zones.
By upgrading to MiraWIPE®, facilities can prevent fiber contamination at its source, reducing the risk of garments becoming contamination vectors.
Final Takeaway: Garments Carry Contamination Beyond the Gownroom
The evidence is clear: gownroom contamination doesn’t stay in the gownroom. When garments pick up fibers and particles during gowning or equipment wipe-down in lower-classified zones, those contaminants enter ISO 5 and Grade A/B areas, threatening product quality. Segregation alone is not enough. Facilities must adopt advanced auditing tools like PolyCHECK® and high-performance cleaning materials like MiraWIPE® to prevent contamination transfer.
Take Control of Garment Contamination
Don’t let cleanroom garments undermine your contamination control efforts. Request a PolyCHECK® assessment or a MiraWIPE® sample today to identify and eliminate fiber and particle transfer before it impacts your manufacturing processes. By addressing gownroom practices, you can protect your cleanroom’s integrity and ensure compliance with the stringent pharmaceutical and medical device production demands.