Frequently Asked Question


Choosing the right size for your Cambridge Mask is essential for ensuring the mask performs effectively. Our store is available in Black color and 3 different sizes for the whole family. The Cambridge Mask now has adjustable ear loops for a customised fit. We generally recommend using your weight to choose the size as suggested in each size description.

Size L: for Adult from 65-89kg
Size M: for Adult from 33-64kg
Size S: for Children from 11-32kg

Can the Mask be washed?

The mask can be hand washed with Soap and hot water, however this will not extend the life of the filters as the pollution will be locked into them. As the whole mask is the filter, when past its useful life a new mask is needed. Please do not machine wash or dry the mask. 

How long can the mask be used for?

Cambridge Masks™ are non-disposable and can be used up to 340 hours. The length of time they are suitable for depends on how polluted the environment is when you use it. A table is provided below.

*As air quality conditions in Vietnam is normally between 51-150, we suggest you to use maximum 340 hours.

How often do I need to change the filter?

Good news! You don’t need to change the filter because the whole mask is the filter. To provide the best seal possible we have sewn the filter directly into the mask. This does not mean the mask will expire faster either, as they are made to last 3-6 months, please check our usage table above to learn about the guidelines.

Is the mask latex free?

The classic mask does not contain any latex.

What does the valve do?

The valve assists in quick exhalation of CO2 from your mask.

What does the mask filter?

• Almost 100% of Particulate Matter (PM) including PM10, PM2.5 and PM0.3. These are the sort of particles you find in coal dust from power stations, diesel exhaust fumes, factory emissions and from construction works. 

• Almost 100% of gas based air pollution, including odours such as Volatile Organic Compounds (VOCs), Ozone, Benzathine, and Formaldehyde. These particulates you can find in petrol fumes, chemical emissions and from many industrial processes.  

• Almost 100% of harmful pathogens such as viruses and bacteria. 

• Other airborne irritants or allergens such as Dust, mould spores, some odours, pet allergens and pollen.

Has the mask been independently tested?

The filters used in the Cambridge Mask meet the N99 standard (higher than N95). This is a US Government specification for pollution masks. Cambridge Masks have been independently tested by Nelson Labs, USA which confirmed almost 100% of particulate pollution, bacteria and viruses were successfully filtered when tested. The masks use a triple-layer filter system which will protect from a range of airborne contaminants.

Test Performance

 99.6% average filtration of viruses

 99.77% average filtration of bacteria

 99.7% average particulate filtration down to 0.3 microns

Who is the mask for?

• Anyone exposed to urban environments with high air pollution levels – any big city often has higher air pollution. You can find a number of apps and websites to tell you the air quality in your area. 

• People in at risk groups for respiratory disease, including children, elderly, pregnant women and those with existing respiratory conditions. 

 Asthmatics and allergy sufferers including Hay Fever. 

 Hobbyists and DIY such as woodworking and sanding. 

• Anyone travelling to regions known for poor air quality such as China and India. 

• Anyone seeking protection for airborne irritants such as Dust and mould

3 thoughts on “Frequently Asked Question”

  1. To whom may concern

    My friend in China needs 1million PCs of mask in urgent. Could you please inform if you have stock to meet this requirement?

    Best regards,

  2. Hi Mr.Nguyen I have 2 orders 1st order # 111 and 2nd order #112, and I need 2 things from you first is your Bank Swift code and secondly is the invoices. Please kindly send it to my email

    Simon Lee
    My mobile is +60166639595

Leave a Comment

Your email address will not be published. Required fields are marked *