The Simpson Strong-Tie CILV32 Low-Viscosity Structural Injection Epoxy for Concrete Crack Repair is a two-component epoxy packaged in a 32 fl. oz. dual cartridge for structural concrete repair. This is a structural injection epoxy designed for concrete crack repair. Model Number: CILV32. It is built for pros and serious repair work where a crack needs more than a surface patch and the goal is to restore bond inside the concrete.

What makes this product matter is its low viscosity. Simpson lists it at 350 cP at 72°F, which means it is thin enough to penetrate narrow cracks that thicker repair materials may bridge over instead of filling. It is intended for hairline cracks as small as 0.002 inch and for cracks up to 1/4 inch wide. On real repair work, that means it can move into fine fracture lines under pressure or by gravity feed, which is exactly what you want when the damage is deeper than what you can see on the surface.

The CILV32 is not just a filler. It chemically bonds with the concrete to provide a structural repair, and Simpson states that it also seals the crack from moisture, helping protect embedded rebar from corrosion. That is a practical advantage on slabs, walls, and other structural concrete where water intrusion can turn a crack into a bigger long-term problem. It is also non-shrink and resistant to oils, salts, mild chemicals, and freeze-thaw exposure, so the repair is built to hold up in service instead of just looking fixed for a week.

Jobsite conditions matter with concrete repair products, and this one is more forgiving than many epoxies. It is moisture-tolerant and can be used on dry or damp surfaces. Simpson also lists a base material temperature range of 40°F to 90°F, which gives you a workable window for a lot of repair seasons and indoor or outdoor conditions. If you are doing pressure injection work, it is formulated for maximum penetration under pressure and can be used with metered pressure-injection equipment. If the crack is horizontal, it is also suitable for gravity-feed and flood-coat applications.

The cartridge format is set up for straightforward dispensing. The 32 oz. version comes as a side-by-side dual cartridge and includes an EMNO22 mixing nozzle. Simpson notes that cartridges like this are dispensed through a static mixing nozzle using either a manual or pneumatic dispensing tool. That makes the CILV32 a practical choice for repair crews that want cleaner mixing, less waste, and faster setup than bulk-mix alternatives, especially on smaller or more targeted repair jobs.

From a spec standpoint, the details line up with serious repair use. The mix ratio is 2:1, VOC is 2 g/L mixed, and shelf life is 2 years in unopened packaging when stored dry between 45°F and 90°F. Yield is listed at 231 cubic inches per U.S. gallon. Toolup also lists flood-coat coverage at roughly 150 to 200 square feet per gallon depending on surface profile and porosity, plus temperature-based pot life data that shows how quickly working time changes as conditions warm up. For anyone doing planning, those numbers matter because epoxy that sets too fast or flows too slow can ruin a repair before it starts.

The compliance side is also important here. Simpson lists this product as meeting ASTM C881 and AASHTO M235 requirements across multiple type and class categories, and it is approved under NSF/ANSI Standard 61. If you work in structural repair, municipal work, or commercial maintenance, those approvals help answer the first question that usually comes up: is this repair epoxy actually rated for the kind of work we are doing?

Who should buy it? This concrete repair epoxy makes sense for concrete repair contractors, general contractors, facility maintenance teams, municipal crews, and experienced users handling structural crack injection or bond restoration in existing concrete. If you need a simple cosmetic crack filler, this is more product than you need. If you need a low-viscosity epoxy that can penetrate fine cracks, bond structurally, and work in pressure-injection or gravity-feed applications, this is the right kind of material.

Simpson Strong-Tie CILV32 Low-Viscosity Structural Injection Epoxy earns its keep on real crack repair work

If you need a repair epoxy that can actually move into fine concrete cracks and create a structural bond, this is the kind of product you buy instead of rolling the dice on a generic patch.

• Who it's for: Contractors, maintenance crews, and experienced concrete repair users doing structural crack injection, gravity-feed repairs, or bond work on existing concrete.
• Why it stands out: The low-viscosity formula, moisture tolerance, cartridge format, and structural bond make it a practical choice when penetration and repair quality matter more than just filling the surface.
• Worth knowing: This is a hazardous material product, and it is a repair epoxy, not a cosmetic filler. It works best when you actually need structural performance and you follow the temperature and application limits.

• What is this product used for? It is used for pressure-injection of cracks in structural concrete, gravity-feed and flood-coat filling of cracks in horizontal concrete, structural repairs, and bonding new concrete or repair mortars to existing concrete.
• What crack sizes can it handle? Simpson lists it for hairline cracks as small as 0.002 inch and for cracks up to 1/4 inch wide.
• Can it be used on damp concrete? Yes. The product is described as moisture-tolerant and suitable for use on dry and damp surfaces.
• What temperature range is it designed for? The listed base material or usage temperature range is 40°F to 90°F (4°C to 32°C).
• Does it meet recognized standards? Yes. It meets listed ASTM C881 and AASHTO M235 requirements and is approved under NSF/ANSI Standard 61.