Portwest P351 FFP3 valved respirator mask with fold-flat design, dolomite clogging test, exhalation valve, and adjustable nose clip. CE certified to CAT III. Individually wrapped for clean storage and vending machine compatibility.
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The Portwest P351 FFP3 valved mask is a high-performance disposable respirator built for trades where serious airborne hazards are part of the job. FFP3 is the highest filtration class available for disposable masks, and this one earns its place on site with a practical fold-flat profile, a proper exhalation valve, and the dolomite optional clogging test, meaning it keeps breathing easy for longer in dusty, humid conditions. If you’ve ever worn a cheap mask for a full shift and felt like you were breathing through wet cardboard, you’ll understand why the dolomite test matters.
What Makes the Portwest P351 FFP3 Mask Worth Carrying
The vertical fold-flat design is genuinely useful rather than just a selling point. It packs flat in a pocket, a tool belt, or a van glovebox without picking up contamination, and each mask comes individually wrapped in a polybag for exactly that reason. On longer jobs or in hot conditions, the high-performance exhalation valve takes a lot of the effort out of breathing out, which reduces heat build-up inside the mask and helps you keep it on properly rather than pulling it down every ten minutes.
The headbands are ultrasonic welded, not stitched, with toggle adjusters on each strap for a proper fit across different head shapes. The nose bar is adjustable and has foam padding around it, which helps with both comfort and glasses fogging. Small details, but they make a real difference when you’re wearing one for hours at a stretch.
CE Certification and Compliance
The P351 carries CE certification to CAT III, which covers the most serious risk categories including respiratory hazards. It meets EN149 as an FFP3 rated disposable, and the dolomite clogging test adds a layer of confidence for longer-duration work. These are suitable for asbestos removal, silica dust, fine particulates, metal fumes, and other hazardous airborne substances where FFP3 is specified. Always check your COSHH assessment and site safety requirements to confirm the right protection level for the specific hazard.
Pro Tip: When fitting the P351, use both hands to mould the nose bar firmly across the bridge of your nose before pulling the straps on, then do a positive and negative pressure check: a poor seal at the nose is the most common cause of FFP3 failures during fit testing.
The Portwest P351 FFP3 valved mask is used across a wide range of trades and environments where fine or hazardous particulates are present. Asbestos removal and licensed remediation work is one of the most common applications, as FFP3 is the minimum requirement specified under HSE guidance for disturbance of asbestos-containing materials. Beyond that, it is widely used in silica-heavy environments such as stone cutting, concrete grinding, and brick work, as well as in metal fabrication, pharmaceutical production, and wood processing operations where fine dusts or biological agents are a concern.
The fold-flat format makes it a practical choice for site managers who want to stock masks ready for rapid deployment without bulky storage requirements, and the individual polybag wrapping keeps each mask clean until it is actually needed.
Best For
Asbestos removal and remediation
Silica dust from stone, concrete and brick work
Fine wood dust and MDF processing
Metal fume and welding applications
Pharmaceutical and biological hazard environments
Extended wear in hot or humid conditions
Available In
Single unit
Box of 20
Key Features
FFP3 filtration rating
CE certified CAT III
Exhalation valve for reduced breathing resistance
Dolomite optional clogging test (D)
Vertical fold-flat design
Ultrasonic welded head straps with toggle adjusters
Foam-padded adjustable nose bar
Individually wrapped in polybag
Not suitable for: Not suitable for use against gases or vapours. This mask does not provide oxygen-enriched air and must not be used in oxygen-deficient atmospheres.
Before fitting, check the mask is undamaged and within any stated shelf life. Open the polybag, unfold the mask, and cup it in both hands with the valve facing outward. Position it over your nose and chin, then pull the straps over your head, one over the crown and one lower at the back of the neck.
Use both thumbs and forefingers to mould the nose bar over the bridge of your nose. Once fitted, perform a positive pressure check by exhaling gently and feeling for air escaping at the edges, then a negative pressure check by inhaling sharply and confirming the mask pulls in slightly against your face. If either test reveals a leak, readjust before entering the hazardous area. Discard after use and do not attempt to clean or reuse.
Inspect the mask for damage before opening the polybag
Open the polybag and unfold the mask fully
Cup the mask in both hands with the valve facing away from your face
Position over nose and chin, then pull the upper strap over the crown of the head and the lower strap to the base of the skull
Use both hands to firmly mould the nose bar across the bridge of your nose
Perform a positive pressure check by exhaling gently and checking for air escaping at the seal
Perform a negative pressure check by inhaling sharply and confirming the mask draws inward
Readjust nose bar or straps if any leakage is detected and recheck before entering the work area
Discard after use and do not attempt to reuse or clean
Is the Portwest P351 suitable for asbestos removal work?
Yes. FFP3 is the minimum respiratory protection class specified by the HSE for work involving asbestos-containing materials, and the P351 meets EN149 as an FFP3 rated disposable. However, you should always cross-reference with your COSHH assessment, site risk assessment, and any licensed contractor requirements before confirming the specific mask for the task.
Can the P351 be reused across multiple shifts?
No. The P351 is a single-use disposable respirator and should be discarded after each use or when it becomes difficult to breathe through, visibly damaged, or contaminated. Attempting to reuse a disposable FFP3 mask compromises both fit and filtration performance.
The Portwest P351 is constructed from polypropylene and mesh materials with PU foam padding at the nose bridge. It meets EN149:2001+A1:2009 as an FFP3 NR D rated disposable respirator, with the D suffix confirming it has passed the dolomite optional clogging test for sustained filtration under dusty conditions. CE certified to CAT III under PPE Regulation (EU) 2016/425, covering the highest risk protection category. Headband attachment is ultrasonic welded for consistent strength throughout the wear period.
Standard
EN149:2001+A1:2009
Filter Class
FFP3
CE Certification
CAT III
Valve
Exhalation valve
Clogging Test
Dolomite optional clogging test (D)
Design
Vertical fold-flat
Materials
PP, Mesh, PU Foam
Head Straps
Ultrasonic welded with toggle adjusters
Packaging
Individually wrapped in polybag
SKU
P351WHR
Box Quantity
1, 20
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