We have a variety of cutting-edge plants, punches and robotic-supported presses. Extremely short and efficient communication channels enable us to ensure individual planning and implementation in close cooperation with our customers.

Certified masks


Product and scope of delivery

The DFA mask program currently includes 4 certified masks.
Here you will find the instructions for use for all four types.


Sono E2

4-layer FFP2 respirator with rubber straps and external nickel-free nosepiece according to PPE regulation.
Certificates: EN standard: 149:2001 + A1:2009t).


For further details on our product, please find the Certificates here.

Click here to visit our online store for masks!



Our antiviral E3 masks are currently certified according to EN 14683 Type II and have CE conformity.
The antiviral outer layer of our E3 masks is additionally certified according to ISO 20743 (antibacterial effect) and ISO 18184 (antiviral effect).


Sono E5

Our E5 masks are currently certified according to EN 14683 type II and have CE conformity..

For further details on our product, please find the data sheet here.


Sono E6

Our E6 masks are currently certified according to EN 14683 type IIR and have CE conformity..

For further details on our product, please find the data sheet here.

If you have any questions about the product, please contact our sales team by email: 

Click here to visit our online store for masks!


Masks as a kit (produced until 07/2020)


The still available kit consists of the following components:

  • Filter medium
  • Self-adhesive nose clip
  • Elastic band
  • Assembly instructions

Read more…

Our oronasal protection masks are certified according to EN 14683. In addition we had a special permit from the Federal Institute for Drugs and Medical Devices (BfArM). The protective effect of our masks for use during the corona pandemic has been confirmed not only by the BfArM but also by hygiene physicians from surrounding hospitals.

For further details on our product, please find the data sheet here.

  • Minimum order quantity: 1,000 masks
  • Quantities of up to 5,000 units usually available at short notice
  • 1.000 masks packed in a cardboard box approx. 13kg, 800x600x400mm
  • From 10.000 masks on, foil wrapped on a one-way pallet, approx. 150kg, 1200x800x2200mm

If you have any questions about the product (availability, prices, …) or would like to place an order, please contact our sales team by email Sono-MN(at)dfabielefeld.de

And one more hint about the kit in own matter:
Masks, nose clips and rubbers are packed by weight. With a positive tolerance we make sure that you get enough material to assemble the ordered number of masks. As a consequence, however, the number of components may not be 100% complete and you may have some materials left over.


Installation Instructions

Continuous improvements since March 2020 have produced various mask variants.

All PDF assembly instructions (in German) are linked here

Video instructions for the corresponding variants are available on Youtube (here the links):



We are an automotive supplier for acoustic materials, primarily for VW, Audi, BMW and Daimler, and as a medium-sized family-owned company. For years we have been producing our own microfibre fleece made of polypropylene. Our materials meet the test standards for car passenger compartments of BMW, Mercedes and the VW group and millions of our products are used in these vehicles. Due to the standstill of our customers, production capacities are available.
It was and is our concern to use our meltblown plant capacity in the common fight against the COVID19 virus. This requires speed and pragmatism.
On March 20, we therefore started the development of a mouth-nose protection mask and delivered the first models in the same month.


We wish you good health.

Your team from DFA Bielefeld GmbH


SONOZORB - best absorption, lowest weight

SONOZORB is a brand name of our partner GDC Inc. in Goshen, Indiana. Together, we are able to offer absorber-fleece produced by a melt-blown process on different continents. Under the name SONOZORB B. we produce different variants exclusively for the European market.

Meanwhile, our product has been released for many OEMs and first Tier customers and is used for series production in various areas (exterior and interior). All details can be received on demand at one of our OEM sales colleagues or our specialists.

Our products – virtuosos in application

The DFA Bielefeld GmbH offers a wide variety of products and services:

The following exemplary components are used at various parts of the automotive sector, such as the end-wall region (inside, outside), but they can now be found in almost all interior areas as well. The materials and component properties are also very different. They are used for airborne sound absorption and airborne sound insulation.

DFA Bielefeld GmbH
Ernst-Graebe-Str. 10
33611 Bielefeld
Phone: +49 (0)521 5240 - 5
Fax: +49 (0)521 5240 - 442
Email: contactmail

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