Sealants for insulating glass and molecular sieves The sealants department is the most important in the group in terms of volumes. Fenzi produces polysulphide, butyl, hot-melt and polyurethane sealants. Their purpose is to create double glazing with perfect seal without limits in time. Together with the sealants Fenzi also offers to insulating glass manufacturers profiles in aluminium, steel and stainless steel, produced at the Alu-Pro and Rolltech plants and marketed worldwide by the Glass Alliance network. Molecular sieves complete the range of produts offered to insulating glass manufacturers.