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Tribotec

Customer stories


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Stoneridge Electronics’ change
to environmentally friendly lacquer

Stoneridge Electronics is one of the leading subcontractors in the heavy vehicle industry. When Sweden introduced new regulations restricting the use of harmful lacquers, Stoneridge was one of many companies that started to look for a better alternative in terms of the work environment and the wider environment. Tribotec’s silicone based lacquer, the TSE 3991 CU, was the indisputable winner.

Stoneridge Electronics has for a long time been one of the leading subcontractors in the heavy vehicle industry. They manufacture meter displays for heavy trucks and buses for customers such as Mercedes, Volvo Trucks, Scania, etc. In the middle of the 1990s, new legislation was introduced in Sweden that regulated how much solvent a single company could use and release to the environment. Stoneridge Electronics in Örebro had for several years used in its production a solvent-based circuit board lacquer with good performance. Since production volumes were large, it also required a lot of lacquer and so the emissions of solvent were high. In fact, too high in the opinion of the Environment & Public Health Department in Örebro which exerted great pressure on Stoneridge to change to a more environmentally sound circuit board lacquer.

Several lacquers were tested

A long and large-scale project was initiated to find alternative circuit board lacquers. It was quite difficult, because the

equirements for protection were high while the environmental effects had to be minimised. In total, Stoneridge Electronics tested four alternative lacquers during 1999-2002, both internally and at external testing institutes, using so-called blind tests in order for the results to be as unbiased as possible. By this time, Tribotec had introduced the silicone coating TSE 3991 CU to the Swedish market, and Stoneridge became interested in testing it. The TSE 3991 CU is completely free of solvents, while the technical data was very promising. Among other things, the electrical insulation resistivity was very high, and the lacquer cured at room temperature in a relatively short time.

Tribotec’s winning solution
also proved to save time

After three years of careful investigation, the TSE 3991 CU was selected as the best alternative, among other reasons because of its superior protection against condensation. This was very important, since a lorry can be left standing for long periods in high atmospheric humidity. At the same time, it was observed that, with the new lacquer, a slow and costly washing process for the circuit boards could be removed completely from the production line. Unlike the previous lacquer, the TSE 3991 CU showed perfect adhesion even without washing.

Would you like more information?
Contact: Tuomas Ollilainen, +46 (0)705-28 28 79
Product Manager for silicones, Tribotec

  • • Why silicones?
  • • Case stories
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  • • Protection of electronics
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  • • Other silicone products
Tribotec AB | Metallvägen 2 | 435 33 Mölnlycke, Sweden | Tel +46 (0)31-88 78 80 | Fax +46 (0)31-88 78 87 | E-mail: info@tribotec.se