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Discover now our wide-ranged job offers and have a carreer at Dr. Dietrich Müller. We are looking for:

  • Wholesale and Foreign Trader
  • Graduated in Electrical Engineer


PCIM Europe Nuremberg 2015

Thermally conductive pad: Thermipad TP 22715 with 15 W/mK

SPIE Smart Structures/NDE conference

Electronics & Components Hong Kong

Imports and exports of the electrical industry


InnoTrans Berlin

World Energy Engineering Congress Washington

Enova Paris

International Electric & Automation Show Bucharest

CFRP profiles

Energie Impulse Aachen

Water-jet cutting

 CWIEME in Berlin 2013

Coil Winding 2013

Thermiglue TL 23010

Coil Winding 2012

CWIEME Berlin 2012

Italian bobbin manufacturer

Working hours

NEC Birmingham UK

Advanced Engineering UK 2011

Clean Energy Expo Asia 2011

Contract 4S iPhone protectors


Electric Drives Production Conference

MOTEK 2011 and Bondexpo

IAA 2011

Norton TH

ArpaxX-Aramid Paper

Slot insulation material

Bern and public transport

Germany with great opportunities in the field of electric cars

Stamp parts from Valox for the lighting industry

Thermal management for LED – Applications

APTIV films are available as a new high performance materials

ArpaxX - push up the heat: Dr. Dietrich Müller GmbH

ZVEI: The Electrical Industry expects that the boom will continue in 2012

Lectures at the CWIEME Berlin 2011

CWIEME Berlin 2011: Dr. Dietrich Müller GmbH with a large product range

Increased Growth Forecast for the German Electrical Industry

Hannover Messe CoilTechnica:  A Good and Positive Response for Dr. Dietrich Müller

Delivery situation in Japan

FIEE: A resounding success for Dr. Dietrich Müller


Dr. Dietrich Müller: Punched parts made ​​of 3M VHB Tape

Dr. Dietrich Müller: Nomex® parts in self-adhesive version.

Dr. Müller GmbH CoilTechnica, Hannover.

MT in different varieties and Thermiflex

Dr. Müller GmbH: New product for the solar industry

Dr. Dietrich Müller registered as a UL – „Repackaged Recognized Components“ Company.

CWIEME Berlin 2010: Dr. Mueller in Ahlhorn

Dr. Mueller: High technology and innovation at one time in one venue

Dr. Müller GmbH continues its leadership as a supplier of Ultem films

Dr. Müller GmbH: New product line for films release

Dr. Müller proud of the opening of the Germany's first offshore wind park

Müller and Temac: Distribution agreement sealing materials

Get involved with the latest insulation product offerings at the Coil Winding 2010 – Dr. Müller GmbH


Direct request:

Enquiries from the United Kingdom:

Dr. Dietrich Mueller UK Limited

Tel    +44 7549 834830
Fax   +44 2476 996466


Enquiries from all other countries:

Tel: +49 4435 971010
Fax: +49 4435 971011

Let us know, which product you are
looking for and we will give you the
adress of the right distributor.



Limiting Oxygen Index as per ISO 4589

The purpose of testing the limiting oxygen Index (LOI) is to measure the relative flammability of a material during flame impingement in a controlled environment. The LOI states the minimum concentration which is required to maintain a flame impingement of the thermoplastic material for 3 minutes or for a length of 50mm. The atmosphere in the testing cylinder consists of a N2/O2 composite which is controlled from the outside. The vertical supported sample is set alight with a pilot flame from above. The pilot flame is removed and the oxygen concentration is reduced until the test piece cannot feed the flame anymore. The higher the LOI is, the lower the flammability of a material is.

Pciture 8:


Chart 22: Limiting oxygen index



In comparison to other polymers, the GE-films characterise through their high flame resistance. Because of that they are used for numerous applications in the electro-technics and electronic, in the automotive construction and in the building industry. GE-films with flame retardancy offer increased resistance against flame impingement.

Reaction to fire according to UL94 – preliminary remark

Standard 94 of the Underwriters Laboratories (UL) established itself worldwide as the most important norm for the classification of the flammability of plastics. According to UL94 the property of a material to turn off on laboratory conditions after inflaming, is tested. The classification depends on the burning rate, the time it needs to go out, drop- (aflame/non-flame) or hole formation and the duration of afterglowing. There are several possible classifications for every material, it depends on the wall thickness and/or colour.  When selecting the concrete material, it should always made sure that the classification which is equal to the thinnest wall-cross-selection, is taken. Information about the UL94 classification is only comparable and meaningful if the relevant wall thickness is stated.

An overview for the UL-94 classification*

HB-test piece horizontal, burning rate <76 mm/min for wall thicknesses under 3 mm or under 38 mm/min for wall thicknesses of more than 3 mm.

V-0- test piece vertical, self-extinguishing up to 10 s, no burning drops, afterglowing of max. 30 s

V-1- test piece vertical, self-extinguishing up to 30 s, no burning drops, afterglowing of max. 60 s

V-2- test piece vertical, self-extinguishing up to 30 s after removing the flame, burning drops acceptable, afterglowing of max. 60 s

5V- bigger flame, test piece vertical, self-extinguishing up to 60 s after 5 x 5 s
flame impingement, no burning drops, afterglowing of max. 60 s

5VA- like 5VB, but no burning holes accepted – highest UL94-classification at the moment

5VB- like 5V, but the plate-shaped testing piece is horizontal, burning holes accepted after turning off

VTM-0- classification for very thin materials, requirements like V-0, test piece is not rod-shaped but cylindrical


Usually the usage of materials certified to UL94 HB is permitted whenever flame resistance is required because of fire prevention. HB materials also are not recommended for electrotechical applications except they are only used for mechanical and/or decorative purposes. Suitable HB materials are also available for connector casings which require a high comparative tracking index. Frequently misunderstood: materials without fire protection or such which are not suitable for FR applications do not fulfil the HB criterions automatically. Although HB is the lowest flammability classification according to UL94 it can only be met after testing.

Picture 9: Testing for materials with wall thicknesses of up to 3mm according to UL94 HB



UL94 V-0, V-1 und V-2

Test rods with same measurements like they are for the HB test are tested with a flame which is as high as it is for the HB test but for this classification the test rods are hold vertically. Essential is the burning- and glowing time as well as if there are burning drops and if these light the test setup cotton which is only acceptable for V-2. Burning drops are said to be the chief cause for flame propagation in case of fire.

Picture 10: Testing according to UL94 V-0, V-1 and V-2

*Depending on the film model and –thickness; GE films are available for all mentioned criteria. Classifications according to this norm cannot be seen as a hazard index for the tested materials or other materials in case of fire.

**Please contact our laboratory and application engineering for more information.