Gorilla Glue Original Polyurethane Adhesive is trusted by rocket builders and manufacturers for bonding solid-propellant grains, phenolic liners, and motor casings. The moisture-cure polyurethane formula expands slightly as it sets—penetrating microscopic pores in propellant surfaces and fiber-reinforced liners to produce a cohesive, vibration-resistant bond.
Manufacturer Features & Technical Data
100 % waterproof, solvent-free adhesive.
Expands ≈ 3–4× its original volume to fill small gaps and eliminate voids.
Bonds wood, phenolic, fiberglass, carbon fiber, paper, foam, metal, and composites.
Clamp time ≈ 1–2 hours | Full cure ≈ 24 hours.
Service temperature range: -40 °F to 200 °F.
Rocket Motor Applications
Propellant grain bonding: Adheres grain segments together or to liners, ensuring concentric alignment and consistent burn surfaces.
Liner attachment: Provides a secure, flexible bond between phenolic or fiberglass liners and aluminum or composite cases.
Casting bonding: Useful for securing inhibitors or closure disks where epoxy is too rigid or heavy.
Field repairs: Ideal for quick reinforcement of delaminated tubes or thrust rings.
The cured polyurethane is mechanically tough yet slightly flexible, absorbing thermal expansion and combustion vibration. Its water-resistant nature prevents degradation during curing or exposure to humidity.
Usage Tips for Rocketry
Lightly mist one surface with water before applying; the glue requires moisture to cure properly.
Apply a thin, even layer—expansion will fill minor voids.
Clamp or tape components for at least 60 minutes; allow 24 hours for full cure before motor assembly.
For precision grain bonds, prevent squeeze-out into nozzle or port areas.
Why It’s Ideal for Motor Construction
Unlike traditional epoxies that can become brittle, polyurethane maintains resilience under temperature and pressure cycling inside solid rocket motors. It provides a strong adhesive interface between propellant segments and liners without significantly adding mass or brittleness.
Use Gorilla Glue 2 oz for dependable, high-temperature-tolerant bonds in reloadable and experimental motor work—trusted for composite-liner and grain integration in advanced rocketry applications.
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