The most common application is the insulation of refrigerators, freezers, and other appliances.To create the insulation, liquid polyurethane foam is injected into the space between the inner and the outer liner of the devices. As the material expands, the air is displaced and escapes through a number of ventilation holes. The venting tape is used to cover these holes. It prevents the foam from escaping but allows the air to go through.
While the current tesa® 4576 achieves an air permeability of 6 cm3/cm2*s, we have now developed a new tape which allows air to escape even more quickly. The tesa® 4580 is only dotted with adhesive instead of being fully covered, resulting in air permeability of 52 cm3/cm2*s. This allows for a faster foaming process and helps the polyurethane to spread evenly.