Izitsha zinokuvuleka okukhulu ngo-40% kunezimbotshana zokuvula ezijwayelekile ze-aluminium. Kwenziwe Ngokucacile, Uhlobo 1 Ikilasi A noma i-Amber, Uhlobo 1 Ikilasi B, ingilazi ye-borosilicate. Izitsha zinikeza isiqeshana sokubhala esineziqu esijwayelekile ukuze sigcwaliswe kalula futhi sihlonzwe