Piezentul standard stabile?te metodele de deteiminaie a :
— umidit??ii ;
— apei de cristalizare;
— apei de hidratare;
— ale?linit??ii fa?? ? de ienolftalein? ;
— reziduului insolubil ?n acid elorhidric ;
— dioxidului de siliciu, di
STAS 4474/2-1987 history
1987STAS 4474/2-1987 PLASTER AND GYPSUM Determtnation of moisture, crystal water, hydration water, alkalinity regarding phenolphtalein, insoluble residue in hydrochloric acid and silicon dioxide