voestalpine isovac® backlack-v®

Our coating innovation

With its development of the innovative backlack-v® coating voestalpine has made it possible for customers for the first time to efficiently bond electrical steel packages for applications in generators and industrial engines while improving product quality at the same time.

The excellent processing properties of the full-surface adhesive-bonded electrical steel packages lead to a substantial increase in production process efficiency. Optimum matching of the base material with the coating makes it possible to significantly reduce processing temperatures and times across the entire range of isovac grades. As a water-based varnish system, backlack – v ® is also extremely environmentally compatible. Improved coil stability guarantees optimized handling and increased safety.

voestalpine isovac® Verbessertes Klebeverhalten

Improved adhesive behavior, especially in the long term

  • Higher typical adhesive strength
  • Improved sustained temperature and hydrothermal resistance of the adhesive-bonded stack
voestalpine isovac® Verarbeitungsvorteile

Processing advantages in stack manufacturing

  • Reduced enameling time and diminished pressure
  • Shortened cooling time
voestalpine isovac® Bessere Wärmeleitfähigkeit und magnetische Eigenschaften

Improved performance characteristics

  • Improved thermal conductivity through optimized adjustment of lacquer fillers
  • Improved magnetic properties based on nearly complete protection against short circuits between laminations
voestalpine isovac® Qualitätsverbesserung

Improved material quality

  • Consistent quality of supply
  • Prolonged service life based on decelerated ageing

Advantage of thermal conductivity

* Filling the areas between the laminations with bonding varnish not only increases thermal conductivity of the stack. The stacking factor is also reduced considerably less than would be expected from the higher layer thickness of the bonding varnish.


voestalpine isovac® Backlack in a minute

Backlack in a minute

Are you ready for a new dimension in bonding? The backlack-v® + accelerator system reduces bonding times to a minimum, making the large-scale production of electrical steel stacks possible. voestalpine now offers the latest development in Backlack technology with the high-speed Backlack innovation for electric motors of all types and sizes. In addition to the proven Backlack advantages, including freedom of design and mechanical stability, the new system also offers a number of additional high-efficiency properties.

What does chocolate cake have to do with highly efficient electric motors?

Electric motors need an iron core, and highly efficient electric motors need an iron core made of individually stacked laminations made of electrical steel. But how are these individual laminations optimally bonded with a perfect fit? In a mouth- watering video, Professor Metin Tolan lifts the secret of how this works with Backlack on isovac® electrical steel. We invite you to learn more.

voestalpine isovac® Prof. Metin Tolan

Backlack - the joining technology for perfect lamination stacks!

The stator and rotor cores of electrical machinery are manufactured using thin laminations stacked together by our customers in order to minimize eddy current losses. There are several ways to join these laminations, and the most efficient way is to use Backlack.