Cambridge Mask Co PRO N99 Reusable Masks

Corner Chemist


:: Product Description ::

Unique Lab tested British Military Filtration Technology filters almost 100% of pollution, gases, and 99.6% of viruses and 99.7% of bacteria.

Treated with silver to protect the wearer against bacteria and viruses.

The masks use a triple-layer filter which protects the wearer from an extensive range of airborne contaminants.

The first layer of the filter system catches larger pollution particles such as dust and PM10. It’s then backed up by the Three-Ply Micro Particulate which stops nearly 100% of smaller particulate matter such as PM2.5 and PM0.3.

The inner filtration layer is made from 100% pure activated carbon cloth, originally developed by the UK Ministry of Defence for chemical, biological, and nuclear warfare protection.

The carbon filter is treated with silver to ensure 99% of harmful pathogens are removed and killed.

This multi layered  filter system means the Cambridge Mask performs better and lasts longer than other masks on the market.

The PRO Mask can be used for up to 340 hours depending on the level of pollution it is exposed to. For the average customer this is around 3-6 months of wear.

The mask can be washed with soap and hot water, however, keep in mind that this will not extend the life of the filters.

Independently Tested Filter

Our Cambridge Mask PRO meet a wide range of tests to ensure they are effective and safe to use for the whole family.

✔Certified as child safe under 14 U.S.C 1278a and CFR Parts 1370 1501 1500.53 and 1500.44 (Certified by Bay Area Testing Labs)

✔EN149 standards for CE in the European Union (Certified by SAI Global and Apave Labs FR)

✔99.6% viral filtration efficiency and 99.7% bacterial filtration efficiency (tested by Nelson Labs USA)

✔Particle Filtration Efficiency >98%

Cambridge Mask Pro models adhere to the European FFP2 standard. This means that they are certified as providing at least 94% filtration for particles at 3 micrometres.

On top of the FFP2 certification, Cambridge Mask also meets the filtration requirements for the NIOSH N99 standard. Although the mask is not officially certified as N99, it does meet the requirements and has been lab-tested.

N99 requires that a respirator filters at least 99% of particles at 3 micrometres, whereas N100 requires a 99.97% filtration. Therefore, with filtration of 99.7%, Cambridge Mask Pro performs well about the minimum filtration requirements of the N99 standard. 

Compared to most other reusable respirators on the market, Cambridge Mask offers one of the higher filtration specifications. Many other popular masks offer only 95% filtration. 

The Cambridge Mask also features 99.6% and 99.7% filtration for viral particles and bacterial particles respectively. These particles were tested at 3 and 3.2 micrometres, as is the standard for respirators. 

In viral and bacterial filtration, there are other masks that offer higher filtration (99.9%). However, it is a close comparison.

However, the filtration qualities of Cambridge Mask for viral and bacterial particles are still very high. Further, the fine dust filtration is some of the best in class for a reusable respirator.

:: Fit ::

Fit is perhaps the second most important aspect of any respirator. It might not seem like it initially, but a perfect fit is vital.

If a respirator does not create a seal on your face particles such as fine dust, bacteria, and viruses can avoid the filter and enter around the edges. 

This means that the air (that comes through the sides) is not actually being filtered. While you may receive some protection, you will not receive the full extent that the mask can offer. 

For this reason, achieving a good fit is essential. Luckily, this is one of Cambridge Mask’s strengths.

Cambridge Mask follows the standard reusable mask formula, a filter with a valve and ear straps. However, it also has one bonus that is one of its greatest appeals.

That is the chin straps that the Cambridge Mask Pro has. Unlike other ear-strap respirators, the Cambridge Mask features two adjustable straps on either cheek.

These straps are elastic and create a strong seal around the chin. With the current global situation, these straps are extremely handy.

In times such as this, it’s vital not to touch your mask. However, the adjustable straps give you an easy way to adjust the mask without touching the filter or ear-straps. 

The Cambridge Mask also features the wire nose-piece that is standard in most respirators.

:: Sizing ::

How to:

Either use the weight range as a guide 


Use a tape measure

First, measure from the middle of your nose to about a little over an inch under your chin, this would be your reference for the first number on our size chart.

For the width can be tricky, as human nose have different in size. So make sure to add few mm to your measurement to avoid mask to be too small for your nose or you cheek.

Second, measure from right cheekbone to the left, for the width of the mask. Make sure the tape sized correctly. You may use mirror or other’s help to be accurate while measuring.


Adults 33-64kg

150x190mm (top to bottom x across the face)


Adults 65-89kg

170-200mm (top to bottom x across the face)


Adults 90kgs & up

175x220mm (top to bottom x across the face)