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>
Airworthiness tariff suspension
condition:C,certificate:C119,action:27|condition:C,action:07