Bisco is a brand name for a high performance silicone foam with a unique compression set. The compression set (recovery value) is much better than rubbers of all levels. Water seals with Bisco can be realized with a pre-pressure of 10 till 80%. Even at high pressures like 80%, the compression set is still relatively good compared to other sealing materials. The large range of 10-80% compression makes it possible to seal large variations of gaps in constructions.The extra advantage that Bisco can offer is an even lower push back pressure (CFD) than Poron or other soft sealing materials. So if a high degree of certainty and long life is demanded of a seal and there is also an higher temperature or a fragile construction, Bisco is an excellent option.