This material, called mastic, is essentially a sealant and grouting material and can move up to an average of 25%. If needed, it is possible to increase its flexibility rate to specific rates.
Mastics are often preferred for various purposes, such as their sealing abilities, filling gaps, keeping water and air away from the joints, absorbing the natural movement of building materials, and improving aesthetics. Silicon and polyurethane are essentially two popular sealants. Despite their common goals, the key differences between them should be known.
Key Differences between Silicon Mastic and Polyurethane Mastic
The main difference between these two substances is the ratio of the chemical levels. Polyurethane is an organic material. On the other hand, silicon is an inorganic material. In polyurethane mastics, it can be easier to differentiate features such as stiffness, adhesion power, thixotropy and flexibility according to the needs. Moreover, mechanical resistance and adhesion power can be much higher than silicon.
In order to understand how sealing materials perform outdoors, it is necessary to look at their solar resistance. In the presence of UV light, polyurethane, which is an organic material, tends to return into its natural polymer state and deteriorates over time by losing its features.
Silicone, an inorganic material, does not have such a problem. However, polyurethane construction mastic can have maximum UV resistance with the help of some special additives. It does not deteriorate in any way and even shows a high level of resistance to colour change.
Usage Areas and Classifications of Polyurethane Mastic
Polyurethane mastics are differentiated in terms of their use and purpose. They are basically divided into polyurethane mastics used for sealing purposes and polyurethane mastics used for adhesive purposes.
Polyurethane Mastics Used for Sealing Purposes
Polyurethane mastics with Shore A hardness up to 45 are classified as low modulus. It is preferred to in the joining parts of the prefabricated construction elements, in the joint parts of rainwater collection pipes and rain sprouts on the roofs, for closing the remaining open operational work area with between the precast concrete blocks as well as sealing the joints of aluminium pipes in the HVAC (ventilation) sector.
Polyurethane Sealants Adhesive Purposes
Polyurethane mastics with Shore a hardness 45 and above are classified as adhesive mastic. Their surface adhesions are high, while their flexibility is low. They are preferred in particular in the automotive sector, in the manufacture of cars, caravans, etc., in the repair of automotive glasses, in the sealing of metal structures such as containers and truck frames, in the manufacture and installation of air conditioning in the HVAC systems, for reducing the vibration and ensuring the sealing in the joining parts of metal panels.
Titanium dioxide products in Kimteks are RC 833, RC 86, RC 823, RC 84, RC 82.
