![]() They have a low chemical and heat resistance, high compression set and low thermal stability. Thermoplastics are soluble in specific solvents and will disintegrate when in contact with many solvents. This caulk base has several colour variations.ĭarker Thermoplastic colours become nearly impossible to remove under sunlight in the heat of summer. Thermoplastic sealants change color quite fast: white will become yellow and black will fade, turning into a blueish gray color. They aren’t certified to be applied on glass, meaning they shouldn’t be used to replace thermo joints on windows. Thermoplastics have lower adhesion when compared to most sealant types. Thermoplastics degrade, lose their flexibility and crack when exposed to direct sunlight or ultraviolet light levels for extended times. Dark thermoplastics shades are tough to apply in the summer, leaving bubbles to expand within the caulk bead. On the downside, Thermoplastic Elastomers are caulking materials that repeatedly soften or even melt when heated and harden when exposed to freezing weather. Rubberized thermoplastic sealants are flexible & elastic and like silicone, they can stretch and shrink back to their original shape multiple times during temperature change. They are easily available to anyone at any hardware store in many colours. They are also available as a single unit meaning the buyer isn’t stuck with leftover material from a bulk purchase. Their main attraction is their very low cost when compared to commercial type sealants. In the residential sector, the most commonly used type of caulking is rubberized thermoplastic. SILICONE VS RUBBERIZED THERMOPLASTIC (AKA THERMOPLASTIC ELASTOMERS) Polyurethane caulk is a more toxic product, especially the types that contain Xylene.The life span of most polyurethane caulking will be 10-20 years if well applied, however, polyurethane caulks can show signs of aging after 2-3 years on the south facing side of a building. The application of polyurethane is challenging under cold or hot temperatures. They also change consistency quite a lot when applied at different temperatures making the temperature at which they can be applied much more limited. The consistency of polyurethane caulking is fairly liquid, meaning it is more likely to drip all over unwanted surfaces. ![]() It requires more time and often may increase the price of a caulking service. The removal process of polyurethane from building components is harder than that of silicone. ![]() Polyurethane caulks tend to change colour over time: White can become yellow, dark colours fade and become a blue-grey shade. Polyurethane caulk has a tendency to facilitate the growth of moss and lichen in humid and shaded areas.Ĭolour variations are available, however, the selection is quite limited. Polyurethane sealants are prone to attracting dust and dirt all over their surfaces. Unlike silicone, polyurethane doesn’t wash easily. The time required to cure is typically longer than silicone, allowing more time for foreign contaminates to come in contact with the polyurethane caulking.Ĭleaning the joints is difficult and almost impossible. Polyurethane is unable to stick to the glass properly. Polyurethane has better adhesion to specific surfaces like wood and some types of 3 part polyurethanes (colour pack, polymer-urethane base and a harder) can even stick to somewhat semi-humid masonry. Polyurethane doesn’t withstand cold and heat cycles, while Silicone conserve its flexibility at temperature changes. It also has a tendency to crack and split when exposed to sunlight. Polyurethane caulk tends to degrade at accelerated rates when exposed to sunlight as its UV resistance is low.
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