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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.



Thermal deformation resistance

Thermal deformation resistance and Vicat softening point state information about the short-timed resistance of a plastic under pressure against high temperature. With the help of standard tests, each temperature (DTUL) at which the sample meets a certain deflexion or complies with the pressure of a needle up to a penetration depth of 1mm (Vicat), is determined.

During these tests the sample is treated with a controlled tensile and bending stress. The higher the values are the higher is the thermal resistance of the material in the application area. The mechanical properties of all thermoplastics change with the impacted temperature. This procedure is slow and nearly linear for amorphous polymers like Lexan® polycarbonate and Ultem® polyetherimide. Valox® thermoplastic polyester shows a distinctive dependency to the temperature as it is a crystalline polymer. Diagram 3 illustrates the tensile modulus as function of the temperature.

GE films often are a good choice for high temperature applications because of their high thermal stapability.

The wide softening range of Lexan® and Ultem® simplifies the thermal forming. Screen printed Lexan® film can be cured at temperatures up to 120°C.

RTI (heat ageing)

The relative temperature index (RTI) of plastics for electrical applications means, according to UL: “the maximum service temperature at which the material remains to its critical properties in fungible limits for longer terms.” The values in chart 10 are based on a 100,000 hours period of use. The RTI test is essential for product certifications according to UL. The antiquitated phrase of “continuous operating temperature” should be avoided.


As Lexan® and Ultem® are isotropic and amorphous polymers, they are relative dimensionally stable at high temperatures. Short-timed tests (30 min) in the laboratory did not show noticeable changes of measurement. Lexan® was tested up to 135°C and Ultem® up to 150°C. Lexan® films with a thickness of 0.075 up to 0.125mm shrink about 0.5% at 150°C (glass temperature). Thicker qualities shrink about 1% to 2% at the same temperature. At temperatures above 150°C the shrinking increases clearly. Lower temperatures do not have effects to Lexan® films as they remain to their low temperature toughness up to at least -135°C.