Expanded shale is an industrially manufactured lightweight aggregate produced from natural roofing slate from the nearby Raumland Böhl quarry. Wittgenstein roofing slate is geologically classified as coming from the Rhenisch Slate Mountains and was formed around 380 million years ago. This raw material contains organic components as the sedimentary rock and has a very similar composition to clay. This is one of the reasons why it is also known as shale. Originally, tailing ponds from roofing slate production were used as a raw material for manufacturing expanded shale.

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  • Marble and natural stones
  • Landscaping contractors
  • Concrete aggregates
  • Lightweight aggregates for concrete
  • Dry screed
  • Roof greening material
  • Concrete repair
  • Expanded shale
  • Plant substrate for rooftop gardens
  • Filter media
  • Surface greening material
  • Rooftop greening material
  • Lightweight aggregates for concrete
  • Gardening and landscaping
  • Mineral substrates
  • Hydroponics substrate
  • Filtra Perl
  • Spray protection strips on buildings
  • Grits for patios
  • Grit ceilings
  • Spray protection strips
  • Slope stabilisation
  • Material for mulching
  • Structure-tight light concrete
  • Prefabricated elements
  • Rooftop grassing
  • Natural stonework
  • schist
  • lightweight concrete
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  • 11 – 50
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  • Site status Site status Registered office, Parent company
  • Main activity Main activity Manufacturer/ Producer

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