As infrastructure projects across Southern Africa continue to place increasing emphasis on durability, long-term performance and lifecycle cost efficiency, effective waterproofing at structural joints remains a critical component of quality construction.

Responding to this need, Chryso Southern Africa continues to support the market with ADCOR® 500S, a high-performance hydrophilic waterstop solution engineered to prevent water ingress through concrete construction joints and penetrations.

ADCOR® 500S is a conformable, butyl rubber-based hydrophilic waterstop strip that expands on contact with water. Once fully encapsulated within poured concrete, the controlled expansion creates a robust seal against adjacent concrete faces, effectively preventing water entry into below-ground and other water-sensitive structures.

This makes the product particularly well suited to critical applications such as basements, retaining walls, pile caps, floor slabs, lift pits, tunnels, water-retaining structures and pipe penetrations, where waterproof integrity is essential to long-term structural reliability.

According to Andries Janse Van Rensburg, Specialty Materials Head – Infrastructure BU, Chryso Southern Africa, waterproofing failures at construction joints can have significant implications for structural durability, maintenance costs and operational continuity.

“Water ingress through joints remains one of the most common risks in below-grade and water-retaining concrete structures. ADCOR® 500S provides a highly reliable and technically advanced sealing solution that responds directly to the presence of moisture, creating an active barrier where it is needed most,” Janse Van Rensburg says.

A key differentiator of ADCOR® 500S is its controlled volumetric expansion which reduces the risk of concrete spalling while maintaining cohesive strength after expansion. Unlike conventional bentonite-based systems the product is designed for reproducible swelling performance, even after repeated wet-dry cycles, ensuring long-term sealing integrity in demanding environments.

The product is also highly malleable and conformable, allowing for easy application to irregular substrates and complex concrete profiles. This flexibility simplifies installation on site and supports quality workmanship across a wide range of project conditions.

“With modern infrastructure projects becoming increasingly complex, contractors require waterproofing systems that combine performance with ease of installation,” Janse Van Rensburg explains. “ADCOR® 500S offers both technical reliability and practical site advantages, helping to reduce installation risk while supporting long-term structural durability.”

The waterstop system is designed to withstand hydrostatic pressure of up to 70 metres and delivers a minimum volumetric expansion of 100%, making it particularly effective in high water table environments and critical civil engineering applications.

As part of Chryso Southern Africa’s broader waterproofing and construction chemicals offering, ADCOR® 500S reinforces the company’s focus on delivering advanced, fit-for-purpose solutions that enhance the performance and longevity of infrastructure assets across the region.