AbstractA zeolite of P type with a molar ratio SiO2: Al2O3of about 6 was obtained on laboratory and on enlarged scale, by synthesis carried out at 100°C in Na2OK2OSiO2Al2O3H2O system, without complexing agents. It was found that the products depend not only on the chemical composition of hydrogel but also on the kinetic factors such as: the material of the reactor wall, the amount of substrates taken for crystallization and stiring. It was found that the stability of zeolites increases in the order: L