Sticky Mat 101: How to Maximize Contamination Control at Every Entry Point
The floor is the largest surface in any controlled environment, and it never stops accumulating contamination. Every person who walks in brings particles with them, and every wheel, cart, or piece of equipment rolling across the threshold adds more. Sticky mats are your first line of defense, but only when placed correctly, sized right, and replaced on schedule.
The cleanroom supply experts at Medco Supplies put together this guide to help you map every high-risk entry point, choose the right mat size for each location, build a documented replacement schedule by ISO class, and meet the requirements of ISO 14644-5:2025.
Why are entry points your highest-risk zones?
Foot and wheel traffic account for 80 to 90 percent of all particles introduced into a cleanroom. A single person walking generates approximately 5 million particles per minute from skin, clothing, and footwear. Those particles become airborne as traffic increases, settle on work surfaces, and trigger batch failures. For an ISO 7 cleanroom, the allowable limit is 352,000 particles of 0.5 microns or larger per cubic meter. For ISO 5, that limit drops to 3,520. Contamination control at the threshold is not optional; it is arithmetic.
Most contamination enters at transition zones, not inside the cleanroom itself: the corridor, the gowning room, the anteroom, the equipment bay. That is where sticky mats do their work, and that is where gaps in coverage are most costly.
Where should you place sticky mats?
A single mat at the main cleanroom door is not a contamination control program. High-performing facilities treat every transition zone as a control point. Place mats at the main cleanroom threshold, the gowning room entry, the anteroom or air lock, the equipment and cart entrance, and the staging area exit. Each zone carries different traffic volume, and the mat size should match.
For width, the mat should cover at least two-thirds of the doorway. For depth, 24 inches minimum ensures two footfalls per foot; high-risk thresholds benefit from 36 to 45 inches. Use a 36" x 60" or 36" x 72" mat at the main threshold. Use a 26" x 45" minimum at gowning room and anteroom entries. Equipment bays need a mat rated for wheel loads, typically 36" x 72".
How often should you replace sticky mat sheets?
For most cleanrooms, change sheets every 30 to 50 walk-throughs. In ISO 5 and ISO 6 high-traffic environments, change sheets every 25 entries or hourly. In ISO 7 environments, change at each shift or when visibly soiled. In ISO 8, end-of-shift changes are usually sufficient. Unclassified environments like hospital corridors or construction sites can use a visual trigger: change when the sheet looks dirty.
To remove a used sheet, start at the numbered corner tab and peel slowly around the edges toward the center, forming a bag shape to contain debris. Lift straight up and dispose immediately. Pulling quickly creates static and releases trapped particles back into the air. Most Medco sticky mats include numbered pull tabs on each of the 30 sheets, making it simple to log changes for compliance records.
What does ISO 14644-5:2025 require for floor-level contamination control?
The 2025 revision of ISO 14644-5 introduced the Operations Control Programme (OCP), a documented framework that links every operational element affecting cleanroom cleanliness. Floor-level contamination control, including tacky mats, now sits explicitly within this framework. For pharmaceutical manufacturers, EU GMP Annex 1 also requires a documented Contamination Control Strategy (CCS) that covers entry-point measures.
Compliance requires: a documented surface cleaning and replacement schedule (Clause 6.2), defined entry-point controls for personnel and materials (Clause 5.3), a risk-based change frequency tied to traffic volume (Clause 6.1), and verifiable change records (Clause 7). A sticky mat placed at a doorway without a documented change schedule does not satisfy the standard. A mat with a defined schedule, logged changes, and periodic review does.
How do you install a sticky mat correctly?
Start by cleaning the floor with 70% IPA alcohol and 30% water. Wax polish, floor coatings, or any residue will prevent full adhesion. Allow the surface to dry completely. Sticky mats perform best on smooth, non-porous surfaces like vinyl, epoxy, or ceramic tile. Avoid textured concrete, anti-slip grit epoxy, or grouted tile; these require a mat frame.
Remove the bottom protective sheet only, leaving the top film in place. Align the mat perpendicular to the door so traffic crosses the full length, with the longer side running the direction of foot travel. Press firmly from the center outward to remove air pockets, then apply body weight or a roller. Finally, slowly peel the top film starting at the pull tab to expose the adhesive surface.
Order sticky mats in bulk from Medco Supplies
Available in blue, gray, or white, sticky mats come in cases of 4 or 8 in sizes from 18" x 30" to 36" x 72". Each mat has 30 numbered adhesive sheets treated with an antimicrobial agent. To get a quote for a bulk order, contact us today. Same-day shipping on in-stock sizes.
Sources
Medco Supplies — Cleanroom Sticky Mats Collection
Medco Supplies Blog — Everything You Need to Know About Sticky Mats
Medco Supplies Blog — Tacky Mats: How They Work and Why Every Cleanroom Needs Them
Pristine Clean Bags — Cleanroom Sticky Mats: The Ultimate Guide to Contamination Control
Maximum Matting — Contamination Control Matting: Complete Cleanroom Guide (ISO 14644-5:2025)
Antistat Inc — ESD Sticky Mats: Antistatic Contamination Control
FAQs
Q: What is a sticky mat used for?
A: A sticky mat (also called a tacky mat or adhesive mat) is a multi-layer adhesive floor covering placed at the entry points of cleanrooms, labs, hospitals, and other controlled environments. Each layer traps particles, dust, and debris from shoe soles and equipment wheels. When the top layer is soiled, it peels away to reveal a fresh adhesive surface.
Q: How often should I change my sticky mat sheet?
A: For most cleanrooms, change sheets every 30 to 50 walk-throughs. In ISO 5 and ISO 6 high-traffic environments, change every 25 entries or hourly. In ISO 7, change at each shift. In ISO 8, end-of-shift changes are sufficient. Always log changes for compliance records.
Q: Are sticky mats required for ISO compliance?
A: ISO 14644-5:2025 requires documented contamination control measures at all entry points as part of the Operations Control Programme. Sticky mats satisfy this requirement at the floor level when paired with a documented change schedule and maintenance log.
Q: When will my order ship?
A: Most orders ship the same day.
Q: Can I get help with my order?
A: Our online support team offers professional advice and support.
Q: Can I return it?
A: Our customer service representative can help you with returns.
