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Views: 0 Author: Site Editor Publish Time: 2025-11-09 Origin: Site
In underground construction, effective waterproofing is essential to ensure structural durability and long-term safety. Water ingress through concrete joints, embedded components, or cracks can cause serious structural and maintenance issues.
To overcome these challenges, water-swelling polyurethane sealants—also known as hydrophilic waterstop sealants—have become one of the most reliable solutions for below-grade waterproofing systems.
A water-swelling polyurethane sealant is a single-component, elastic sealant that reacts and expands when exposed to water. It provides a dual sealing mechanism. Elastic sealing creates a flexible rubber-like barrier to block water paths. Self-swelling sealing expands upon water contact to form a secondary waterproof layer.
This dual action ensures superior protection even under high hydrostatic pressure and continuous water exposure.
This type of sealant is designed specifically for underground structures such as tunnels, subways, sewage treatment tanks, basements, and other below-grade facilities.
It bonds strongly to both wet and dry concrete surfaces, ensuring excellent sealing performance in real construction conditions.
High expansion rate up to 400% for tight sealing of joints
Withstands water pressure up to 2.5 MPa
Strong adhesion to concrete, steel, and embedded components
Excellent flexibility and temperature resistance
Non-toxic, eco-friendly formulation—safe for structures in contact with potable water
Easy to apply with a standard caulking gun; suitable for both professional and field use
At KINGWIT Sealant, our TP640 Water-Swelling Polyurethane Sealant delivers superior waterproofing for underground construction joints and embedded components.
With its high bonding strength, elasticity, and remarkable swelling capability, TP640 ensures a long-lasting seal in the most demanding environments. It is ideal for railway tunnels, subways, sewage tanks, basements, and foundation structures—offering a reliable and cost-effective waterproofing solution.
As infrastructure projects increasingly expand underground, advanced waterproofing technologies are vital for safety and longevity. The TP640 Water-Swelling Polyurethane Sealant
combines elasticity, intelligent swelling response, and environmental safety to deliver dependable protection against water leakage—making it the smart choice for modern underground construction. If you are interested in bulk purchase on this product, please do not hesitate to contact us, we are willing to send free samples for you!
Contact Person: Viola
WhatsApp&Phone No.：+8619353218907
Email: viola@sdsealant.com
