How do polyurethanes behave concerning hypothetical attacks by chemical, biological and ultraviolet radiation? Sd Stampi, leading company in Modena in polyurethane molds, gives an explanation.
Polyurethanes, in general, guarantee an interesting refractory reaction to solvents and chemical agents. They excellently resist hypothetical attacks.
Furthermore, polyurethane foams are not soluble within organic solvents. They can be attacked by substances such as alcohol or ketones, and in this case they generate a series of enlargements, protrusions or sunken.
One of the advantages of polyurethane is that it can be combined with all kinds of metal covers as it is compatible with various types of organic adhesives.
Another precious peculiarity is the behavior towards the materials used in the treatment of fiberglass, in particular in the internal processing of vans, tanks etc.
What about molds? Polyurethane has an excellent resistance to biological substances. The polyurethanes are resistant to biological attack and therefore prevent the proliferation of fungi
Light and therefore ultraviolet radiation favor the yellowing of the surface layer of the polyurethane product, causing oxidation of the material. It must be added, however, that the deterioration does not affect the internal state of the products that maintain their performance-related qualities, but only the layer directly exposed to light.