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Views: 0 Author: Site Editor Publish Time: 2025-06-28 Origin: Site
Polyurethane sealants have long been trusted in the construction and infrastructure industries for their excellent adhesion, elasticity, and weather resistance. Suitable for both indoor and outdoor use, these non-toxic, environmentally friendly sealants bond well with concrete, metal, glass, and plastic—offering service life up to 20 years when protected from prolonged UV exposure. Today, an advanced evolution of this technology is transforming waterproofing standards: the Water-Swelling Polyurethane Sealant.
Also known as polyurethane water expansion sealant, this material combines the benefits of conventional polyurethane sealants with the added feature of volume expansion when exposed to water. This dual-action mechanism ensures enhanced sealing capability for areas prone to water ingress—even under long-term exposure.
Made with a polyurethane prepolymer base and enhanced by a specialized grafted urethane chain, the TP640 series from KINGWIT maintains its swelling ability over time without degradation or loss of sealing effectiveness. It exhibits exceptional chemical resistance, enduring acidic and alkaline environments such as seawater, hydrochloric acid, and sodium hydroxide, making it ideal for harsh underground or water-retaining conditions.
| Feature | Benefit |
|---|---|
| Water-induced expansion (220%–400%) | Fills micro-cracks and joint gaps dynamically as water penetrates |
| Dual sealing mechanism | Combines flexible elastic sealing + reactive swelling for complete barrier |
| Corrosion resistance | Resists acids, alkalis, and saltwater |
| Long service life | Maintains performance without loss of swelling agents |
| Safe and non-toxic | Suitable for potable water environments |
| Easy application in humid conditions | No strict drying needed before construction |
TP640 is designed for use in critical water-retaining and underground structures, including:
Drinking water tanks and treatment plants
Swimming pools, reservoirs, and storage basins
Subway tunnels and underground garages
Sewage treatment facilities and waste channels
Road and railway tunnel joints
Precast concrete segment joints and expansion joints
Its non-toxic, VOC-free formulation makes it especially suitable for projects involving direct contact with potable water, such as municipal water reservoirs and urban water supply systems.
KINGWIT is a trusted B2B manufacturer of professional-grade sealants with global supply capabilities. Our TP640 Water-Swelling Polyurethane Sealant is engineered for long-lasting performance in the most demanding waterproofing environments. It is suitable for drinking water systems becuase of expanding dynamically upon water contact for unmatched sealing performance. And this PU sealant is built for tunnels, tanks, reservoirs, and underground infrastructure. At the same time, it is no complex surface preparation required, which is easy to apply in construction. And we also provide 7-24 technical support and customizable OEM options!
