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THE MASUKU has undergone rigorous testings by the Nelsons Laboratory, USA, achieving a Bacterial Filtration Efficiency (BFE) of >99.8%, a Virus Filtration Efficiency (VFE) of >99.7%, and a Particle Filtration Efficiency (PFE) of >99.5%.


Nelson Labs® is the industry-leading, global provider of laboratory testing and expert advisory services for MedTech and pharmaceutical companies, touching the lives of more than 180 million people around the world each year. With more than 700 scientists and staff in state-of-the-art facilities worldwide, Nelson Labs⁴ performs over 700 rigorous microbiological and analytical laboratory tests across the medical device, pharmaceutical, and tissue paper industries.



The Bacterial Filtration Efficiency (BFE)⁵ test is performed on filtration materials and devices that are designed to provide protection against biological aerosols, such as face masks, surgical gowns, caps, and air filters. This test is used for FDA 510(k) submissions for surgical masks, and is required by ASTM F2100 and EN 14683. It also complies with ASTM F2101 and EN14683.


THE MASUKU’s BFE test achieved BFE levels of >98%, which meets the performance requirements of EN 14683:2005 as a Type II and/or Type IIR device.The masks yielded differential pressures of less than 29.4 pascals (Pa)/cm3 which meets the performance requirements of EN 14683:2005 as a Type I and/or Type II device.



The Viral Filtration Efficiency (VFE) test follows the same procedure as the BFE test. The challenge organism used is the bacteriophage phiX174. Challenge controls are maintained at 1100-3300 plaque-forming units (PFU) with a mean particle size (MPS) of 3.0 ± 0.3 µm. This allows filtration efficiencies to be reported up to >99.9%. The VFE test procedure was adapted from ASTM F2101.


THE MASUKU’s PFE test achieved PFE levels of >99.5%, which means that more than 99.5% of viruses, as small as 3 nanometers, are filtered out. 



The Particle Filtration Efficiency (PFE)⁶ test evaluates the nonviable particle retention or filtration efficiency of filter media and other filtration devices at sub-micron levels. This test is performed on face masks and all filter material that allows 1 cubic foot per minute (CFM) flow to pass through it.


Also referred to as Latex Particle Challenge, this test is required for ASTM F2100 and is performed according to the ASTM F2100 and follows the basic principle of ASTM F2299. Nelson Labs offers a high level of expertise in PFE testing and is one of the only companies to offer this test. 


The PFE test procedure employed the basic particle filtration method described in ASTM F2299.



Outer Layer

The outer layer of THE MASUKU is made up of a special blend of poly-cotton fabric that enhances the breathability and supports the structure of the mask.  


Middle Layer

The middle layer features a soft, dense, and durable melt blown non-woven fabric. The melt blown non-woven fabric has special properties such as absorbency, thermal insulation, cushioning, wash-ability, strength, sterility, liquid repellency, and bacterial barrier. The melt blown process⁷ is a non-woven manufacturing system involving direct conversion of a polymer into continuous filaments, integrated with the conversion of the filaments into a random laid non-woven fabric. Using the melt blown technology, the spun filaments are accelerated by means of hot, fast-flowing air that is directly blown onto a moving substrate, creating a self-bonded web, thus effectively preventing even smaller droplets and sand from being inhaled by the user.


Inner Layer

THE MASUKU’s inner layer comprises a fabric woven in a waffle-pattern which makes it excellent for filtration without compromising on its comfort. It is also designed to absorb moisture for more comfort.

Innermost Layer

The Ultra-Thin Filter Technology has been formulated to ensure that THE MASUKU has excellent filtration capabilities.


These 4 layers were specially selected to obtain the combination of materials for optimal breathability and reusability for the user.


All fabrics used for THE MASUKU have also been tested for colour fastness to ensure that their colour does not run and they maintain a high level of durability even after washing.


Other Features of Our Fabric:



"With the working professional in mind, we understand that verbal communication plays a huge role in the daily lives of every successful individual. Yet, many reusable masks with good filtration are thick and heavy, posing a challenge to breathing and talking."


THE MASUKU is designed and formulated to have the right balance of filtration and breathability. The mask’s structure allows for some breathing space between your face and the fabric while creating a seal so you are protected from external contaminants.


Furthermore, the outermost layer of the mask is made with materials that are specially blended together to create a more breathable fabric.


The inner layer features fabric that is woven in a waffle pattern, which provides some moisture absorbance for more increased comfort.


Last but not least, THE MASUKU’s Ultra-Thin Filter explains itself.



Many fabric masks are treated with heavy chemicals to enhance or attach various properties. They often require detergent to clean, which may do more harm than good.  


“Some people may be allergic to dyes or the detergent they use to wash their cotton mask,”


explains Noelani E. Gonzalez¹, a dermatologist and director of cosmetic dermatology at Mount Sinai West in New York. As your face is more sensitive, the chemicals in these masks can cause skin irritation or outbreaks.


THE MASUKU is free from heavy chemicals and uses a tightly-woven blend of fabrics to create a comfortable, sophisticated barrier against contaminants.



"We do not want you to relive the days when you first got your newly-fitted glasses or spectacles, where the sudden introduction of the weight of the glasses on your nose and ears starts to cause you discomfort or even headache in some cases."


Wearing a new accessory may cause discomfort or headaches due to the extra weight.

Luckily, THE MASUKU comprises a unique blend of materials that does not compromise on your comfort. Depending on the size you choose, THE MASUKU weighs as little as 7g.



THE MASUKU is more environmentally-friendly as it can be reused again with the attached filter.


The 3-layered mask itself has filtration capabilities better than the run-of-the-mill cloth masks, even after rinsing - maintaining an effective Bacterial Filtration Efficiency (BFE).


For best results, you should hand wash your mask with gentle soap and cold or room temperature water to maintain a higher filtration effectiveness of THE MASUKU for a longer period of time. You may also change THE MASUKU FILTERS for better filtration capabilities.


The structure and colour of THE MASUKU remains unchanged.




The design team experimented with different shapes and formulas before finding that the current shape of THE MASUKU provides better support for the user. 


THE MASUKU’s special 3D structure wraps around your face perfectly with a unique feature at the chin/jawline — the extra fabric (with same composition as the main portion) is sewn separately here to ensure a better fit. This provides a better seal to protect you from harmful pollutants and bacteria, and supports the mask on your face by taking some weight off your nose and ears, making the mask feel even lighter.


Even though it may take more time and is more costly to produce, THE MASUKU team feels that safety and comfort should never be compromised.

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