Polyurethane 120 Structural Foam Tube set

Installed using standard low-pressure crack injection methods with an air-powered injection tool and a 3/8 x 24 static mixer (commonly paired with an injection hose assembly). Supplied in a dual 300mL (22 oz) 1:1 tube set with the retaining nut and static mixer included.

• Keep the product flowing. Once dispensing, don't stop and start — pausing can let the urethane foam up and plug the mixer, forcing a mixer change.
• Warm the cartridge to speed reaction. Pre-warming accelerates foaming; any moisture present accelerates it further.
• For large through-wall voids, anchor a plywood cover over the void, drill a hole just large enough for the mixer tip, and inject through it. Pressure can build, so anchor the cover firmly to the wall.
• Match volume to the void. Depending on temperature and moisture, 120 can expand more than expected, and the reaction may delay up to ~5 minutes. Over-injecting wastes product and makes a mess.
• Cracks running into the footing: inject the first cartridge, then wait about 5 minutes for foaming to begin before continuing — this prevents drain-out into the soil.
• Carbon fiber timing: 120 cures fast enough to apply carbon fiber reinforcement as soon as about 10 minutes after injection.
• Shelf life & testing: guaranteed one year from purchase. To test, dispense a small amount without a mixer into a disposable cup, hand-mix with a stick — if it foams and starts to set within about 20 minutes, it's good. Partially used tubes are usually not reusable, since cross-contamination between the two sides is hard to prevent even with a flow restrictor.

What is NextStar 120 used for?
Structural foundation cracks over 1/2", pipe penetrations, and large void fill — always used with carbon fiber to carry tension. For non-structural leaking cracks, use 102 or 103.

Does 120 need water or moisture to work?
No. It's a two-part hydrophobic foam that expands without added moisture, making it ideal for dry cracks and pipe penetrations.

Is 120 a structural repair on its own?
No. 120 has no tensile strength by itself — it fills the crack and resists compression. Pair it with carbon fiber staples, stitches, straps, or fabric to handle tension. Together, the repair can exceed epoxy alone.

How does 120 compare to epoxy?
Because 120 expands, it uses about half the material of epoxy on large cracks, so foam plus carbon fiber often costs less than an all-epoxy repair while matching or exceeding its strength. For smaller structural cracks, epoxy is often still the better choice.

How much does 120 expand?
Up to about 6 times its original volume. Expansion is moisture-dependent, so it varies with the conditions in the crack.

When can I apply carbon fiber after injecting?
120 cures fast — carbon fiber reinforcement can usually go on as soon as about 10 minutes after injection.

What comes in a NextStar 120 tube set?
A dual 300mL (22 oz) 1:1 tube set with the retaining nut and a 3/8 x 24 static mixer included. An air-powered injection tool is recommended.

Is NextStar 120 the same as the structural foam sold for marine deck repair?
NextStar 120 is a 12 lb high-density structural polyurethane — the same class of injection foam that some suppliers relabel for marine deck repair. We supply it for concrete, foundation, pipe-penetration, and void-fill applications.