In 1985 the company was founded under the motto "Always be practically orientated" by Hans Schmidt, Thomas Leibrock and Manfred Streck after whose initials the company has been named.

The administration still lies in the responsibility of the founders. Meanwhile the second generation - Jürgen Schmidt and Marco Streck - has been integrated completely.

The premises are located in a small industrial area outside Dahn on a surface of about 20,000 m². About 6000 tons of profile material are processed on more than 20 modern extrusion plants annually in shift operation.

SLS develops and produces everything from full profiles to hollow profiles, from standard type profiles to special custom-made profiles, from 20 g to 3000 g per m, in different colours and thermoplastic resins, from rigid over flexible to rigid/flexible combinations in co-extrusion.

Profiles for which a high rigidity is necessary can be manfactured either with glass fibre- or steel reinforcement on request. SLS can also meet the requirements of the electronics industry with conductive or antistatic materials.

The profiles are used for window-, facade- and metal construction, for the automobile-, electrical-, packaging and furniture industry, as well as for the household-, insulation- or the DIY branch.