Expanding silica sands, altered volcanic glass (obsidian), namely, perlite

'alter':4 'expand':1 'glass':6 'name':8 'obsidian':7 'perlit':9 'sand':3 'silica':2 'volcan':5

Thermal insulation panels made of combustible material, of expanded polystyrene (EPS panels), of polyurethane for the thermal insulation of buildings for construction purposes, coated unilaterally, multilaterally or coated on all sides with closed cells, expanded perlite and with mineral binders

'binder':40 'build':20 'cell':34 'close':33 'coat':24,28 'combust':6 'construct':22 'ep':11 'expand':9,35 'insul':2,18 'made':4 'materi':7 'miner':39 'multilater':26 'panel':3,12 'perlit':36 'polystyren':10 'polyurethan':14 'purpos':23 'side':31 'thermal':1,17 'unilater':25

Heat treatment of obsidian building materials

'build':5 'heat':1 'materi':6 'obsidian':4 'treatment':2

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