Adhesive sealants for insulated glass units
Sealants are one of the most important insulated glass unit elements. Properly manufactured glasses are created in the production process based on the method of double sealing, which guarantees air-tightness of the whole system. Air-tightness is ensured thanks to the implementation of organic sealants:
- First degree sealing and, at the same time, the material that holds together print the class is a polyisobuten based resin, commonly known as butyl.
- Second degree sealing . Whose aim is to reinforce the barrier against moisture ingress into the space within insulated glass units. It is also there to prevent leaking of gases out of the space in between individual glass panes, as well as to shield the joinings between a pane and the bar.
The assortment of adhesives that can be used as the second barrier is wider; they differ from one another in terms of quality, features, availability, easiness of application as well as price. The elastic sealants are manufactured with the use of polysulfide polymers, the so-called theoplasts, or based on polyurethane polymers and silicon polymers. They are also used as polyisobuten external sealants – the so-called hot melt. Polyurethane and polysulfide sealants are similar in terms of their features -very high resistance to moisture ingress and argon diffusion. Joints made with the use of these sealants are durable and resistant to aging. The resistance of silicon sealants to moisture ingress and to argon leaks is lower, yet, at the same time, they are more resistant to UV radiation. polyisobuten sealants are highly resistant to vapour ingress as well as to UV radiation. They, however, lack the features of the elastic sealants, so they do not compensate the deformation of insulated glass unit edges, to the extent to which the remaining ones do.
Polyurethane sealants that are commonly used (JOD 32 manufactured in accordance with own eco-friendly technology, among others) make up as much as 70% of overall share in the market of insulated glass unit sealants in Poland, 90% in Western Europe, which is the result of lower purchase costs by around 25%, in relation to polysulfide adhesives, containing no solvents that are harmful to man, and contain no heavy metals that make up other sealants.
Learn more about JOD 32 today.