Simpson CI-LV Low-Viscosity Structural Injection Epoxy (3-gal. Kit) by Simpson 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, as well as for increasing the bond between freshly placed repair mortars or concrete mixes and existing concrete when substrate temperatures are between 40 deg. Fahrenheit (4 deg. Celsius) and 90 deg. Fahrenheit (32 deg. Celsius). With its ultra-low surface tension and formulation for maximum penetration under pressure, this structural injection epoxy delivers a chemically bonded, non-shrink repair that seals cracks against moisture intrusion and protects embedded rebar from corrosion - making it a dependable solution for both pressure-injection and gravity-feed concrete crack repair applications.

Key Features

• Meets ASTM C881 and AASHTO M235 (Type I/II, Grade 1, Class B; Type I/IV and II/V, Grade 1, Class C) and NSF/ANSI Standard 61 - gives buyers confidence that this epoxy meets rigorous industry standards for structural concrete repair and potable water system compliance.
• Chemically bonds with concrete and seals cracks from moisture - delivers a true structural repair rather than a surface patch, while also protecting embedded rebar from corrosion caused by water infiltration.
• Moisture-tolerant formula can be used on dry and damp surfaces - eliminates the need to fully dry the substrate before application, saving prep time and allowing use in real-world field conditions.
• Low surface tension formulated for maximum penetration under pressure - allows the material to effectively flow into narrow cracks and hairline fractures that would stop thicker repair products.
• Suitable for pressure injection and gravity-feed applications - one product handles both vertical crack injection and horizontal flood coat filling, reducing the need to source separate repair materials.
• Non-shrink and resistant to oils, salts, and mild chemicals - the cured repair maintains its volume and holds up against common environmental exposures, prolonging the service life of the repaired structure.
• Compatible with metered pressure-injection equipment - integrates smoothly into professional application setups, supporting efficient, controlled delivery for large-scale or repeat concrete repair work.
• Freeze-thaw resistant - the cured epoxy withstands repeated freeze-thaw cycles, making it suitable for exterior and below-grade concrete repairs in cold climates.
• 3-gal. kit includes two 1-gal. cans of Component A and one 1-gal. can of Component B - provides a pre-measured, correctly ratioed package so crews can mix accurately on site without additional measuring.

Why This Product

• Structural-grade repair that works on wet or damp concrete - unlike standard epoxies that require a dry substrate, this moisture-tolerant formula bonds chemically to damp surfaces, making it practical for basements, foundations, and other moisture-prone environments where drying the concrete completely is not realistic.
• One versatile epoxy for multiple concrete crack repair methods - the same product supports pressure injection, gravity feeding, and flood coat filling, as well as bonding new repair mortars to existing concrete, so contractors can use a single trusted material across a range of project types.
• Certified to multiple standards including NSF/ANSI Standard 61 - compliance with ASTM C881, AASHTO M235, and NSF/ANSI Standard 61 means this epoxy meets the requirements for structural repairs in demanding applications, including those involving potable water contact.
• Penetrates narrow cracks and resists long-term environmental degradation - the low-viscosity, low-surface-tension formulation reaches deep into fine cracks under pressure, and its resistance to freeze-thaw cycles, oils, salts, and mild chemicals helps ensure the repair lasts in harsh service conditions.

Specifications

• MPN: CILV3KT
• Brand: Simpson Strong-Tie
• Capacity: 3 gal.
• Components: Two-component epoxy (Component A + Component B)
• Substrate Temperature Range: 40 deg.F (4 deg.C) - 90 deg.F (32 deg.C)
• Standards: ASTM C881 & AASHTO M235, Type I/II, Grade 1, Class B; ASTM C881 & AASHTO M235, Type I/IV and II/V, Grade 1, Class C; NSF/ANSI Standard 61 (379 in.2 /1,000 gal.)
• Country of Origin: United States

Approved Applications

• Pressure-injection of cracks in structural concrete
• Gravity-feed and flood coat of cracks in horizontal concrete
• Repair of hairline cracks and cracks up to 1/4" (6 mm) in width
• Structural repairs
• Bonding new concrete or repair mortars to existing concrete
• Underwater pressure-injection applications

What's Included

• (2) 1 US gallon (3.8 L) cans of Component "A" (CILV1A)
• (1) 1 US gallon (3.8 L) can of Component "B" (CILV1B)

Frequently Asked Questions

What substrate conditions is CI-LV suitable for?

CI-LV is moisture-tolerant and can be used on both dry and damp surfaces, making it suitable for a wide range of concrete repair conditions including underwater pressure-injection applications.

What temperature range is required for proper application of CI-LV?

CI-LV is designed for use when substrate temperatures are between 40 deg.F (4 deg.C) and 90 deg.F (32 deg.C). Applications outside this range are not recommended.

What types of cracks can CI-LV be used to repair?

Due to its low surface tension and formulation for maximum penetration under pressure, CI-LV is effective for repairing hairline cracks as well as cracks up to 1/4" (6 mm) in width in structural and horizontal concrete.

What is included in the 3-gallon bulk kit?

The 3-gallon bulk kit includes two 1 US gallon (3.8 L) cans of Component "A" (CILV1A) and one 1 US gallon (3.8 L) can of Component "B" (CILV1B), for a total of 3 gallons of mixed epoxy material.

Downloads and Resources

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