Weeping VS gushing leaks

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With weeping or small leaks, a major focus is on the viscosity, or thickness, of the resin. Low viscosity resins easily penetrate the cracks to ensure all leaking areas are repaired.

Hydrophilic chemical grouts are attracted to water and ‘chase moisture.’ In doing so, the grout follows all paths along the crack to reach and seal the leaks. When sealing leaks with chemical grouts, a hairline crack is one that is 1/16” or less. Several Prime Resins products are independently verified to meet NSF/ANSI Standard 61.5 for contact with potable water. This makes them ideal for water treatment, transport and storage structures. Other environmentally sensitive areas, such as seawalls or bulkheads, are also great candidates for our NSF-compliant products.

With weeping or small leaks, a major focus is on the viscosity, or thickness, of the resin. Low viscosity resins easily penetrate the cracks to ensure all leaking areas are repaired.

Hydrophilic chemical grouts are attracted to water and ‘chase moisture.’ In doing so, the grout follows all paths along the crack to reach and seal the leaks. When sealing leaks with chemical grouts, a hairline crack is one that is 1/16” or less. Several Prime Resins products are independently verified to meet NSF/ANSI Standard 61.5 for contact with potable water. This makes them ideal for water treatment, transport and storage structures. Other environmentally sensitive areas, such as seawalls or bulkheads, are also great candidates for our NSF-compliant products.

 When encountering a gushing leak, quick reaction or ‘set’ times are important. This ensures that the resin has the opportunity to react with the water present and expand quickly enough to form a watertight, rigid foam before the leak can wash grout away. Catalysts or activators control set times. Where hydrostatic pressures are high, a hydraulic cement patching material or oakum can stop or slow the flow enough for the chemical grout to react.

Equally important is the expansion rate. Gushing leaks are caused by larger water flows, so a large area must be sealed to stop the leak. Using products with higher expansion rates allows for greater coverage of the void area. In below-grade structures, the large expansion rate also serves to fill any voids behind the structure and thus forms a curtain that serves as a 360-degree shield.

 

Weeping leaks, hairline cracks

AR 800 Acrylate, very low viscosity, low toxicity, elastomeric gel, primarily for geotechnical applications, NSF/ANSI 61.5 compliant for potable water use
AR 870 Acrylate, very low viscosity, low toxicity, elastomeric gel, for crack injection in structures
Prime Flex 900 XLV Hydrophilic, polyurethane, single-component, low viscosity, NSF/ANSI 61.5 compliant for potable water use
Prime Flex 900 MV Hydrophilic, polyurethane, medium viscosity, single-component, for medium to wide cracks
Prime Flex 920 Hydrophobic, water-activated polyurethane, low viscosity, variable set time, NSF/ANSI 61.5 compliant for potable water use. Requires catalyst. Use for curtain grouting if leaks are not high-flow gushing leaks.
Prime Gel 2800 Strippable Rapid cure polyurea non-sag paste for temporary surface seal prior to crack injection of epoxy or polyurethane grouts. Peel it off, leaving a clean surface.

Gushing leaks

AR 800 Acrylate, very low viscosity, low toxicity, elastomeric gel, NSF/ANSI 61.5 certified for potable water use, primarily for geotechnical applications
Prime Flex Hydro Gel SX Hydrophilic, polyurethane, extra low viscosity, single-component, NSF/ANSI 61.5 compliant for potable water use
Prime Flex 920 Hydrophobic, water-activated polyurethane, low viscosity, variable set time, NSF/ANSI 61.5 compliant for potable water use. Requires catalyst
Prime Flex 940 Hydrophobic, water-activated polyurethane, variable set time, highly expansive flexible foam, NSF/ANSI 61.5 compliant for potable water use. Requires catalyst
Prime Plug Hydraulic cement product to stop water flow prior to crack injection
Oil-free oakum Oil-free jute roping