non-metal [ bricks and ] mortars, all being refractory and having a pyrometric cone equivalent (P.C.E.) of 1520° or higher for use at temperatures of 1000° and higher for permanent use and exclusive use in furnace construction; [ non-metal refractory masses having a pyrometric cone equivalent (P.C.E.) of 1520° or higher for use at temperatures of 1000° and higher for permanent use and exclusive use in furnace construction, namely, gunning masses, plastic masses and ramming masses ]

'1000':26,58 '1520':18,50 'brick':4 'cone':14,46 'construct':37,69 'equival':15,47 'exclus':33,65 'furnac':36,68 'gun':71 'higher':20,28,52,60 'mass':42,72,74,77 'metal':3,40 'mortar':6 'name':70 'non':2,39 'non-met':1,38 'p.c.e':16,48 'perman':30,62 'plastic':73 'pyrometr':13,45 'ram':76 'refractori':9,41 'temperatur':24,56 'use':22,31,34,54,63,66

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