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mattoni, lastre, piastrelle, …, refrattari, > 50 % mgo, cao, cr2o3
eldfasta murstenar, block, plattor o l eldfasta keramiska byggvaror, innehållande > 50 % av mg, ca eller cr, uttryckt som mgo, cao resp cr2
mattoni, lastre, piastrelle, … refrattari, < 50 % silice (sio2) o allumina (al2o3): altri
eldfasta murstenar, block, plattor o l eldfasta keramiska byggvaror, innehållande > 50 % sio2 och/eller al2o3, e.k.a.