Ul 1446 Class Homework

EPDG Guiding Principles – They Make Us Who We Are

It’s November, and we are providing you with another issue of The Innovator by EPDG.

As we move through the final quarter of 2016 we are focused, as always, on our Guiding Principles of Safety, Service, Quality and Innovation.

In the last several issues we have highlighted one area of EPDG—our UL testing lab, and we continue that focus in this issue. In May we highlighted our UL expert Mark Winkler as a true Innovator in our organization and a leader in the testing arena of the electrical insulation industry. In the August issue of The Innovator, we focused on the longevity of our UL certifications, which go back more than 35 years. Because of our long-term certifications, we provide our customers with a level of Safety and assurance when you use our UL-recognized products, and in this issue, we focus on the processes we use to establish UL-recognized electrical insulations systems. By offering ELANTAS-owned UL-recognized systems and by working with you to help get your systems certified, we offer a unique Service to the electrical insulation market, and we hope you will work with us to take advantage of this and other services we offer.

ELANTAS PDG, Inc. has always worked hard to be a leader in the electrical insulation industry, providing the Quality products our customers need when they need them, where they need them, and with the correct properties and certifications to meet and exceed our customers’ expectations.

We appreciate the business we have done and are doing together, and we look forward to continuing to grow the industry both in NAFTA and around the globe.

Dr. Susan Graham


ELANTAS PDG, Inc. and UL Recognized Electrical Insulation Systems.

ELANTAS PDG, Inc. has over 200 UL-recognized electrical insulation systems in our file E87039. UL-recognized electrical insulation systems are an integral part of gaining UL recognition for many electrical components. The electrical insulation systems list is a list of insulating components that can be used to build a motor, transformer or coil. EPDG systems can be adopted by manufacturers of electrical components at no charge from EPDG.

These systems are developed by EPDG in our in-house laboratory. All electrical insulation system testing begins with a long-term thermal aging test. It is conducted in accordance with UL 1446 and usually takes 12-18 months to complete. Our testing utilizes non-functional test specimens (motorettes), which incorporate the basic building blocks of an electrical component. They include a minimum of magnet wire, ground insulation and varnish. They may also contain other components such as filament wire. Thirty to forty identical test specimens are constructed. The specimens are divided into groups of ten and mounted to a metal plate, and each group is aged at a single temperature. The aging cycle consists of oven exposure, vibration, cold shock and humidity. After humidity, the specimens are tested electrically. As the specimens fail, a life at each test temperature is developed, and from this data, a curve is able to be determined. This curve results in the assignment of a thermal class. At the end of this test, only the components that were tested are UL recognized. In most cases, this is not enough to build a complete electrical unit. In addition to electrical insulation, other components that serve mechanical functions are required.

The next step in the process is to then perform a shorter-term test to add these components. This test is a chemical compatibility test (CCT), often referred to as sealed tube testing, which takes two weeks to complete. Testing involves a reference tube and a candidate tube. The reference tube contains the components in the motorette described above. The magnet wire is placed in as twisted pair specimens that are coated with the varnish being tested.
The candidate tube contains the same components as the reference with the addition of other non-electrical insulating components and possibly a substitute varnish. There are other aging tests required to determine the suitability of the substitute varnish. The tubes and components are dried and sealed, and the tubes are then exposed for two weeks to a temperature 25C above the thermal class. At the end of that time, the twisted pair specimens are tested for dielectric breakdown. The candidate average dielectric breakdown must be at least 50% of the reference to be considered acceptable.

EPDG has the capability to conduct this testing, and the electrical insulation systems that we develop are another way that EPDG is committed to the electrical industry.


ELANTAS PDG, Inc. is a Proud Member of:


About ELANTAS PDG, Inc.

The Global Leader in Liquid Electrical Insulation

ELANTAS PDG, Inc., (formerly The P.D. George Company) founded in 1919 and based in St. Louis, Missouri, is a premier global supplier of specialty resins for applications in the electrical and electronic industries and is a pioneer in the development of Primary and Secondary Insulation as well as Electronic & Engineering Material technologies.

ELANTAS PDG has been at their current location in North St. Louis City since 1934. In 1996, The P.D. George Company was acquired by ALTANA AG, a specialty chemical company headquartered in Wesel, Germany, and became part of the ALTANA Electrical Insulation Division.

In May 2007, the division was renamed to ELANTAS Electrical Insulation and the St. Louis site became known as ELANTAS PDG, Inc.

Visit our website for more information

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