Properties
Expanded obsidian is a light, mineral, heat-insulating granule with high porosity and grain stability (bulk density approx. 110kg/m³). It can be stored for a long time, easily transported and further processed. The insulating material is hydrophobic – but open to vapour diffusion, reacts alkalinely, is non-flammable, heat-resistant up to approx. 1,250 °C and can be mixed with conventional binders. Since only relatively small quantities of the added binders such as limestone, trass or cement are required, there is a low moisture content in the building material, which in turn causes a very short drying time after processing. The loose granules have an insulation value of λ = 0.0465 W/mK, the thermal plaster or masonry mortar made from it has an insulation value of approx. λ = 0.065 as hand plaster and λ = 0.08 W/mK as machine plaster. By coordinating the recipe, the compressive strength of the end product can be precisely determined. Compressive strengths between those of polystyrene and those of lightweight concrete can be realized. Insulation with expanded obsidian eliminates the risk of mould formation when applied professionally (water vapour diffusion resistance μ = 5).
Delivery forms
The delivery is carried out as loose bulk material in paper bags of 100 l or in big bags with 1 or 2.5 m³ content, as well as in mortar and thermal plaster mixtures (with Trass, cement and methylcellulose and lime lime) in 100 l bags (yields approx. 70 l thermal plaster). Panels for special applications are also available on request.
Expanded
obsidian is used as a raw material for thermal plasters, for loose spaces and for floor insulation under floating screed. Other applications include use as an insulating and non-combustible filler for hollow bricks, for heat- and fire-resistant protective coatings on wooden constructions and as thermal plaster and insulating mortar for walls and roof structures.
TIP: Thermal plaster made of expanded obsidian has proven itself as external insulation for old buildings without a horizontal barrier with rising damp (permeable) as well as for the renovation of thermal composite systems with fire-resistant plaster.
... read more on umweltberatung.at - Die Umweltberatung
red= Areas of application, grey= not possible
