Mixture with a non-stoichiometric composition:<br> <br><br><br>- with a crystalline structure,<br> <br><br><br>- with a content of fused magnesia-alumina spinel and with admixtures of silicate phases and aluminates, at least 75 % by weight of which consists of fractions with a grain size of 1-3 mm and at most 25 % consists of  fractions with a grain size of 0-1 mm<br>
Restriction on entry into free circulation
condition:B,certificate:9009,action:29|condition:B,certificate:9010,action:29|condition:B,certificate:9017,action:26|condition:B,action:09