One of the most important characteristics of modernism in architecture was the use of slender steel frame profiles. At the beginning of the 20th century, new techniques made it possible to make larger facade openings in order to let in more light. These profiles were usually made from hot-rolled steel. The equal leg profile is perhaps the best known example of this.
Working with solid steel resulted in very slim profiles. The welding of solid steel parts to each other resulted in strong connections so that rotating parts could also be very slim. Moreover, it gave the architect a great deal of freedom to design his or her own frame detailing.
One of the most important goals that MHB has set for itself is to give architects the freedom to realize groundbreaking facade designs without compromising on the high technical requirements. The basis for this is laid with the invention of the SL30-ISO®: a solid steel window profile with an integrated insulator that forms such a solid whole that it has the same strength properties as the old uninsulated profile of solid steel. With the SL30-ISO®, architects can once again create ultra-slim frame profiles and come up with their own steel details. The strength properties of solid steel can again be used for what it was originally intended for: opening facades for more light and better visibility with a high degree of refinement in the material used."