Do-It-Yourself Face Mask

Status of information: 31 March 2020

Important note: The Do-It-Yourself (DiY) face mask is not a medical product that provides medically standardized mouth and nose protection. It is not a medical respirator, there is no FFP standard and no certification.

Download the description of the DiY face mask

↧ Download description of the DiY face mask (in German)

 

Type of Filter

Either a two-layer tea towel or a single-layer cotton T-shirt (made of 100% cotton) can be used as an insert in the filter attachment while maintaining good breathability when wearing the mask (see Reference 1 to Reference 3).

Content

Components of the DiY mask
Components of the DiY mask: face mask, filter attachment, one tube and two rubber bands

Components of the do-it-yourself face mask:

  • 1 face mask
  • 1 filter attachment
  • 1 hose (e.g. hose for aquariums, approx. 13 cm long, 6 mm outer diameter, 4 mm inner diameter on silicone basis) as edge protection
  • 2 rubber bands/elastic bands (each approx. 40 cm long, 6 mm wide)
Materials and tools required for completion.
Materials and tools required for completion.

Not included:

  • Fabric filter for use in the face mask (cotton T-shirt or tea towel)
  • Adhesive plaster for fixing the tube

What is needed for assembly:

  • Scissors with a sharp point
  • Staple
  • Adhesive plasters

The plastic of the mask consists of polyethylene terephthalate (PETG) modified with glycol, acrylonitrile butadiene styrene (ABS) or acrylonitrile styrene acrylate (ASA). As a rule, these types of plastics should not lead to skin intolerances. Polylactide (PLA) is not suitable for printing the face mask as PLA warps during disinfection in the oven.

Assembling the mask

Cutting of the fabric filter according to the size of the filter attachment. A tea towel as a fabric filter must be laid twice.
Cutting of the fabric filter according to the size of the filter attachment. A tea towel as a fabric filter must be laid twice.

1. Wash the fabric for the filter (two-ply tea towel or single-ply cotton T-shirt) in the washing machine at a minimum of 90°C before first use Disinfect the face mask, filter attachment and hose at 65 °C for 45 minutes in the oven. For further information see "Disinfecting the mask".

2. Cut the cotton T-shirt according to the measurements for the filter attachment of the face mask. To do this, place the T-shirt in the filter attachment and move it along the edge of the filter attachment with a felt pen. Then cut out the fabric filter from the T-shirt along the markings with scissors. When using a dishtowel as a fabric filter, first lay the dishtowel twice and then cut it out along the filter attachment.

Insert the fabric filter into the filter attachment and cut the hose for the edge protection.
Insert the fabric filter into the filter attachment and cut the hose for the edge protection.

3. Carefully cut the hose lengthwise with scissors or a carpet knife. Cut a 4 cm long piece of the hose for the lower edge of the face mask. The rest of the hose (approx. 9 cm) is for the nose piece of the face mask. Place the tubing along the edge of the face mask and press down firmly so that the tubing acts as an edge protector. The tube should be secured with adhesive tape to prevent the tube from coming off.

4. Pass an elastic band through the two fixing loops on the left side of the mask at the top and bottom. The rubber band should overlap about 2 cm to staple the two layers of rubber band together at both ends in step 2 using a stapler. Place the mask against the face so that the mask is flush with the face and guide the elastic behind the left ear. The elastic band should overlap 2 cm at each of the two fixing loops. The elastic band fits well if it is slightly under tension without cutting into the ear, if the mask is pressed too tightly against the face or if the ear is turned down. The elastic band must not be too loose, otherwise the mask will not fit the face. The mask also sits uncomfortably on the face.

5. Fix both ends of the elastic band with a staple. If necessary, the elastic can be shortened with scissors to the appropriate length.

Wearing of the DiY face mask. The mask should fit flush with the face.
Wearing of the DiY face mask. The mask should fit flush with the face.

6. Repeat steps 4 and 5 for the second elastic and the right fixation loops (from the view when the mask is on).

7. Place the fabric filter in the square filter attachment and then press the filter attachment onto the face mask so that the filter attachment is firmly seated on the face mask The filter attachment must not have any open areas, but must be flush with the face mask.

Wearing the mask

  1. Wash hands thoroughly with soap for at least 20 seconds before putting on the mask.
  2. Place the elastic loops behind each ear. Alternatively, straps can be knotted together behind the head.
  3. The mask should be put on so that the mouth and nose are completely covered. The edges of the mask should fit the face.
  4. Despite wearing the mask, a distance of at least 1.5 m should be kept from other people.

For more information on wearing a face mask, see Reference 4 to Reference 6.

Disinfection of the mask

Note: The mask should not be worn for more than six hours per day. Afterwards the mask and the fabric insert should be disinfected.

  1. Wash hands thoroughly with soap for at least 20 seconds before removing the mask.
  2. Remove the mask very carefully. Do not touch your face during or after removing the mask. Place the fabric filter in a separate laundry bag. The fabric filter should be washed immediately in the washing machine at a minimum of 90°C so that it can be used again. Place the mask on a baking tray in the oven (middle shelf) and disinfect at 65°C for 45 minutes. No third party should come into contact with the mask or the fabric filter.
  3. After preparing to disinfect the mask and fabric filter insert, wash hands again thoroughly with soap for at least 20 seconds.
  4. When disinfection of the mask and fabric filter insert is complete, the mask can be reused. If necessary, the tube for edge protection must be re-fixed with adhesive plasters.

Notes on using the mask

  • If the silicone tubing on the outside of the mask becomes loose, the tubing can be taped to the face mask with a new adhesive plaster. The tube should not be fixed to the edge of the face mask with adhesive (especially not superglue), as adhesive does not fix the tube sufficiently well and the adhesive can cause injuries to the face.
  • If the elastic bands for fixation become loose, they can be reattached either by stapling them to the fixing loops of the mask.
  • If you wear glasses, the lenses may fog up when you breathe out. In this case, the fit of the mask and the glasses should be varied to prevent fogging of the lenses.

References and further information

1. Paddy Robertson. Smart Air. What Are The Best Materials For Making DIY Masks? https://smartairfilters.com/en/blog/best-materials-make-diy-face-mask-virus/

2. Marianne van der Sande, Peter Teunis, Rob Sabel. Professional and Home-Made Face Masks Reduce Exposure to Respiratory Infections among the General Population. PLoS One. 2008; 3 (7): e2618. DOI: 10.1371/journal.pone.0002618

3. Anna Davies, KatyAnne Thompson, Karthika Giri, George Kafatos, Jimmy Walker and Allan Bennett. Testing the Efficacy of Homemade Masks: Would They Protect in an Influenza Pandemic? Disaster Medicine and Public Health Preparedness 7 (4): 413-418 August 2013. DOI: 10.1017/dmp.2013.43

4. NDR podcast Prof. Drosten (Charité Berlin) on wearing masks: https://www.ndr.de/nachrichten/info/podcast4684.html (in German)

5. Do-It-Yourself Masks - Instructions and information: https://maskeauf.de (in German)

6. Andreas Dorow. When to wear a face mask: https://youtu.be/dvlh7F9-nsI (in German)

Contact

Prof. Dr. Henrik te Heesen
Prof. Dr. Henrik te Heesen
Professor FB Umweltplanung/-technik - FR Maschinenbau

Contact

+49 6782 17-1908

Location

Birkenfeld | Building 9925 | Room 12

Consultation

nach Vereinbarung per E-Mail/by arrangement via mail
Prof. Dr.-Ing. Michael Wahl
Prof. Dr.-Ing. Michael Wahl
Professor FB Umweltplanung/-technik - FR Maschinenbau

Contact

+49 6782 17-1313

Location

Birkenfeld | Building 9916 | Room 142

Consultation

nach Vereinbarung

This project is carried out in the Innovation Laboratory Digitization, funded by the Carl-Zeiss-Stiftung

Contact

Trier University of Applied Sciences, Environmental Campus Birkenfeld
Institut for Operations and Technology Management (IBT)
Campusallee 9925
55768 Hoppstädten-Weiersbach
Germany

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