Simpson CI-SLV Super-Low-Viscosity Structural Injection Epoxy (3-Gallon Kit) is a two-component, high-modulus, high-solids, moisture-tolerant epoxy specially designed for pressure injection, gravity feeding, and flood coat filling of concrete cracks when substrate temperatures are between 60 deg. Fahrenheit (16 deg. Celsius) and 90 deg. Fahrenheit (32 deg. Celsius). Formulated for maximum penetration under pressure, this bulk kit delivers a true structural repair by chemically bonding with the concrete, sealing cracks from moisture intrusion, and protecting embedded rebar from corrosion - making it a reliable solution for both horizontal and structural concrete crack repair applications.

Key Features

• Meets ASTM C881 and AASHTO M235, Type I/IV, Grade 1, Class C - conforms to recognized industry standards, giving contractors and engineers confidence in the repair's structural integrity and code compliance.
• Chemically bonds with concrete to provide a structural repair - CI-SLV seals the crack from moisture, protecting rebar in the concrete from corrosion and restoring the load-carrying capacity of the member.
• Moisture-tolerant formulation - can be used on dry and damp surfaces, so repairs do not have to wait for complete substrate drying, reducing project downtime.
• Low surface tension and super-low viscosity - allows the material to effectively penetrate narrow cracks, including hairline cracks, ensuring thorough fill rather than surface-only sealing.
• Formulated for maximum penetration under pressure - optimized for use with metered pressure-injection equipment, driving the epoxy deep into the crack for a complete, void-free repair.
• Suitable for pressure injection or gravity-feed applications - versatile enough for vertical, overhead, and horizontal crack repair scenarios, from structural walls to flat slabs.
• Non-shrink and resistant to oils, salts, and mild chemicals - the cured epoxy maintains its volume and holds up in demanding environments where surface contaminants or chemical exposure are a concern.
• Freeze-thaw resistant - the cured repair withstands repeated freeze-thaw cycles, preserving the repair's structural performance in cold-climate conditions.
• 3-gal. bulk kit - includes two 1 US gallon (3.8 L) cans of Component A and one 1 US gallon (3.8 L) can of Component B, providing a generous supply for larger-scale or multiple-crack repair projects.

Why This Product

• True structural repair, not just a surface seal - because CI-SLV chemically bonds with concrete and is formulated for maximum penetration under pressure, it restores structural integrity across the full depth of the crack, making it appropriate for load-bearing concrete elements where surface patching is not sufficient.
• Handles real-world job site conditions - the moisture-tolerant, freeze-thaw-resistant formula works on damp surfaces and in variable climates, so repairs can proceed without waiting for ideal conditions that are rarely guaranteed on active job sites.
• Engineered for precision crack repair at extreme narrowness - the super-low-viscosity, low-surface-tension formula is capable of penetrating hairline cracks, giving repair crews a single product that covers a wide range of crack widths without switching materials.
• Bulk volume supports larger or multi-location repair scopes - the 3-gallon kit provides substantial material in a bulk format compatible with metered pressure-injection equipment, reducing interruptions from frequent cartridge changes and improving efficiency on high-volume concrete repair projects.

Specifications

• MPN: CISLV3KT
• Capacity: 3 gal.
• Yield: 231 in.3/US gal. (0.001 m3/L)
• Color: Clear
• Applicable Temperature Range: 60 deg.F (16 deg.C) - 90 deg.F (32 deg.C) substrate temperature
• Standards: ASTM C881 & AASHTO M235, Type I/IV, Grade 1, Class C
• Country of Origin: United States

Approved Applications

• Pressure-injection of cracks in structural concrete
• Gravity-feed and flood coat of cracks in horizontal concrete
• As a low-viscosity epoxy (150 cP) for repair of hairline cracks (0.002") and cracks up to 1/4" (6 mm) in width
• For structural repairs
• For underwater pressure-injection applications

What's Included

• Includes (2) 1 US gallon (3.8 L) cans of Component "A" (CISLV1A) and 1 US gallon (3.8 L) can of Component "B" (CISLV1B)

Frequently Asked Questions

What makes CI-SLV suitable for repairing very narrow concrete cracks?

CI-SLV features a low viscosity of 150 cP and low surface tension, which together allow the material to effectively penetrate narrow cracks as small as 0.002" (hairline cracks) and up to 1/4" (6 mm) in width. It is also formulated for maximum penetration under pressure, making it highly effective in pressure-injection applications.

Can CI-SLV be used on wet or damp concrete surfaces?

Yes. CI-SLV is moisture-tolerant and can be used on both dry and damp surfaces, making it well suited for real-world concrete repair conditions where complete drying may not be possible.

What industry standards does CI-SLV meet?

CI-SLV meets the requirements of ASTM C881 and AASHTO M235, Type I/IV, Grade 1, Class C, confirming its suitability for structural concrete repair applications in demanding environments.

What components are included in the CISLV3KT bulk kit?

The 3-gallon bulk kit includes two 1 US gallon (3.8 L) cans of Component "A" (CISLV1A) and one 1 US gallon (3.8 L) can of Component "B" (CISLV1B), providing a complete two-component epoxy system ready for use with metered pressure-injection equipment or other compatible dispensing methods.

Downloads and Resources

• Epoxy Crack Injection Guide
• CI-SLV SDS Material Safety data Sheets