Frequently Asked Questions

Will the size fit me?

The Aropec mask comes in an universal adults size that will fit the vast majority of all adults (women and men).  It measures 17cm from the nose tip to the bottom of the mask and 24cm across the side of the mask.  People with slightly smaller faces will find the mask covering deeper in the chin area.  The fit can be adjusted by loosening or tightening the ear loops which is to be tied by the user.  The knot of the ear loops can be  hidden within the mask itself for a clean look.


How often should I wash the mask? 

Frequency of washing depends on usage length and use case.  If you are mainly using it outside then it can be washed twice or even once a week.  It is recommended to have at least 2 masks to alternate between, to allow the masks to be properly sanitised between uses.


How do I wash the mask?

Please wash the mask in warm water at 60 degrees by hand, for at least 5 minutes.  Please take care not to apply too much pressure to the nose wire or it will loosen up more easily.  You may also let it soak in the warm water for an additional 5 minutes, then hang to dry.  Please do not put it in the washing machine.


Can I use the mask after 50 washes?

After 50 washes, the performance efficacy of the antiviral and antibacterial properties of the mask will fall below its certified amount.  However, it would still be antiviral and antibacterial compared to regular cotton reusable masks, and therefore can still be used.


Will viruses still be able to pass through the 3 layers of the mask?

It is a complex area where more lab test will need to be conducted. No mask will provide 100% protection and this mask is not intended as replacements for the N99 respiratory masks.

The outer layer will help to capture respiratory droplets and there is additional protection as the middle layer is made from non-woven mesh, similar to the materials used in making surgical masks. What cannot be guaranteed are the tiny airborne particles that are in the air in poorly ventilated indoor scenarios where there is a lot of shouting, singing, etc. This is an area of ongoing research where the WHO is still hesitant to provide official guidance even on the transmissibility of the virus. So that situation should be avoided altogether if the aim is to minimise risk of infection – such as going to concerts, singing classes, indoor religious gatherings, or any large indoor social situations.



This mask is not a certified medical mask and should not be used as a substitute or as replacements of N99 respirator masks.  Like all masks it provides a degree of protection against viruses such as COVID-19 but no mask can guarantee that an individual is not infected.  

The Cambridge Mask is not suitable for use in hospital settings by members of health care teams as it is not a single-use item. Unlike disposable medical masks, you would not want to dispose of a Cambridge Mask after just one use, which makes our masks unsuitable for contact with infectious patients. The hospital you work in will have an infection control policy, which must be adhered to when dealing with infectious patients.

A Cambridge Mask could be worn to reduce your risk of respiratory infections when you are not at work in a medical environment. For example, if worn when in public settings or around others with respiratory infections. Other measures that can also be helpful include maintaining a good level of hand hygiene, avoiding crowded areas, and keeping your distance from others (airborne transmission of respiratory pathogens is reduced significantly over a distance of greater than 2m).

Yes, as explained below by the Cambridge Mask Filter Material Testing results:

Our Masks pass the >99% requirement set for the European classification EN 149 and the US classification 42 CFR 84, for the solid aerosol tests.

Due to the further prerequisite of EN 149 in regards to liquid aerosol test, our masks receive a mean of PFE of 97%.

The Cambridge Mask test results: 
Particle Filtration Efficiency   >98%
Breathing resistance   <2 mbar
Bacterial Filtration Efficiency   >99%
Viral Filtration Efficiency    >99%

Mask Fit and In-use PFE: 
The EN 149 also requires a series of activities conducted by individuals to test the mask fit and in-use PFE – whereas the 42 CFR 84, only requires for it to not interfere with common industrial safety corrective spectacles.

The Cambridge Mask PRO is tested to filter 99.6% of viruses and bacteria.

Viruses usually travel on droplets of water, which are very large. The mask will block these particles.

Cambridge Mask PRO filters are treated with silver, which works to enhance the anti-viral properties of the technology.

You can read the USA Centers for Disease Control and Prevention guidelines on Coronavirus here:

“It may be possible that a person can get COVID-19 by touching a surface or object that has the virus on it and then touching their own mouth, nose, or possibly their eyes, but this is not thought to be the main way the virus spreads.”

The 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. The mask will need replacing after extended use to ensure proper filtration.

A table is provided below.

Pollution Level Air Quality Condition (AQI) Description Replace after
Good Below 50 Clear visibility to horizon Mask not needed
Moderate/Unhealthy for Sensitive Groups 51 – 150 Cannot see pollution with the naked eye, slight haz on horizon 340 hours
Unhealthy/Very Unhealthy 151 – 300 Haze at 2-3km visibility 220 hours
Hazardous 301 – 500 Clouds of pollution, visibility around 1km 180 hours
Beyond Index Above 500 Visibility below 600 meters. Fog-like clouds of Pollution clearly visible even in bright sunlight 90 hours

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.

We do not  offer masks for babies under 1.5 years due to the risk of choking and because younger babies’ lungs aren’t yet able to overcome resistance when drawing air properly through our filter materials.

The extra small size is indeed very small, and optimally designed for toddlers or tiny children. The adjustable apparatus is too big to fit on the XS mask, therefore we do not produce adjustable XS masks at this time. You may also notice the XS size does not come with a valve for the same reason. This does not usually create any issues as smaller children do not need to exhale as much air as adults.

  • 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.

Cambridge Mask use a triple-layer filtration system which will protect from a range of airborne contaminants.

Test Performance:

  • 99.60 % average filtration of viruses
  • 99.77 % average filtration of bacteria
  • 99.70 % average particulate filtration down to 0.3 microns

Our Cambridge Masks 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
  • ✔ 99.6% viral filtration efficiency and 99.7% bacterial filtration efficiency (tested by Nelson Labs USA)
  • ✔ Particle Filtration Efficiency > 98%
  • 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 diseases, including children, elderly people, 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.

Cambridge Mask Co. was founded by Christopher Dobbing after he moved to China in 2012. Upon seeing young children badly affected by air pollution issues, he developed a mask to help young people access a quality product that could keep them safe.

Today, Cambridge Mask Co. is a global leader in the consumer mask market for adults and children, and sells to organizations such as US Embassies, major airlines, schools and hospitals around the world.

The company has had a China footprint since it was founded, and many British and international members of the team speak fluent Mandarin.

Like Apple and many of the world’s leading consumer goods companies, Cambridge Mask Co. found that China offers the best opportunity to manufacture a high-quality product in volume, at a price that makes it accessible to as many people as possible.

Cambridge Mask Co. factory is regularly audited to comply with US and EU Government standards and our masks go through a rigorous quality management system during the production process.

The filters used in all of Cambridge Mask are made in the UK and the masks are then assembled and packed in China as is clear on  packaging.

Cambridge Mask Co. production facilities meet the following international standards:

ISO 9001:2008

ISO 13485:2003

Cambridge Mask are fully CE Certified and have passed all of the necessary standards to demonstrate efficiency.

Cambridge Mask Co was founded to help everyone everywhere get outside and enjoy life, without having to worry about what they breathe or the way they look.

Cambridge Mask has a valve that plays a vital role to prevent the buildup of carbon dioxide which can help you to breathe easily. In addition, the valve will help reduce the moisture, which will prevent the buildup and growth of viruses and bacteria.

Cambridge Masks are designed perfectly to fit your face, it will cover the nose down to the chin. No need to worry as you will still be able to breathe normally.

Please note that Cambridge Mask is not intended for use in industrial settings and should not be used to filter chemicals or solvents in a workplace. Please consult a personal protective equipment specialist for information on workplace use of masks.

Our masks pass through a number of quality control checks to ensure and maintain the highest manufacturing standards before we ship it to your address.

Washing the mask before first use is not required. We recommend washing your mask only when necessary as excessive washing will affect the functionality of the filter.

The Cambridge 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, once it has reached its recommended total hours of use, a new mask is needed. Please do not machine wash or dry the mask.

We recommend you wash your mask only when necessary to clean excess dirt off the outer and inner surfaces. Washing the mask excessively may affect the filter performance.

The User Manual Guide is designed for both new and experienced Cambridge Mask customers. You will find important information about usage guidelines, and step-by-step instructions on how to fit your mask. If you are pre-order masks from us and you have not, download the User Manual Guide, you may refer to this link for download it.


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