Gorilla Glue is toxic in its uncured liquid state. The original formula contains 50 to 70 percent isocyanate compounds, which are classified by OSHA as hazardous to the skin, eyes, and respiratory system. The danger varies significantly depending on how you’re exposed: breathing the fumes, swallowing the liquid glue, or getting it on your skin each carry different risks. Once fully cured and hardened, the glue becomes inert and is no longer considered toxic.
What Makes Gorilla Glue Hazardous
Original Gorilla Glue is a polyurethane adhesive. Its active ingredient is diphenylmethane diisocyanate (MDI), a chemical that reacts with moisture to create an extremely strong bond. The safety data sheet lists it as both an acute and chronic health hazard. MDI irritates the skin, eyes, and respiratory tract on contact, and repeated exposure can cause lasting damage to your airways. OSHA classifies isocyanates as potential human carcinogens based on animal studies.
The critical thing to understand is that Gorilla Glue cures by reacting with water. This is what makes it so effective as an adhesive, but it’s also what makes it dangerous inside the body. Moisture in your mouth, stomach, or lungs triggers the same hardening reaction that bonds wood and metal.
Swallowing Gorilla Glue
Ingesting liquid Gorilla Glue is a medical emergency. When the glue reaches the stomach, it reacts with gastric fluid and body heat, expanding to four to eight times its original volume and hardening into a solid mass. This isn’t a mild stomach irritation. The glue forms a rigid foreign body that can block the digestive tract entirely.
Even a small amount of liquid glue can create a surprisingly large obstruction. Surgical removal is typically required, as the hardened mass is too firm and too large to pass on its own or be dissolved. If you or someone in your household swallows uncured Gorilla Glue, contact Poison Control (1-800-222-1222) or go to an emergency room immediately. Do not induce vomiting, as the expanding glue could obstruct the esophagus on the way back up.
Breathing the Fumes
The isocyanates in Gorilla Glue release vapor during the curing process. Inhaling these fumes can cause chest tightness, difficulty breathing, and irritation of the nose and throat. For most people using the glue on a small household project in a ventilated room, the exposure is brief and mild. The real concern is repeated or prolonged exposure.
Isocyanates are one of the leading causes of occupational asthma. Once your airways become sensitized, even tiny amounts of the chemical can trigger asthma-like reactions. This sensitization is permanent. If you use Gorilla Glue regularly for work or hobbies, always work in a well-ventilated area or outdoors, and consider wearing a respirator rated for organic vapors.
Skin and Eye Contact
Wet Gorilla Glue on skin causes irritation and can trigger allergic reactions with repeated exposure. The glue bonds to skin quickly, and once it cures, removing it is difficult and painful. Wiping the glue off immediately, before it hardens, is far easier than trying to peel or scrub cured adhesive. Never use solvents like acetone or paint thinner on your skin to remove it. If the glue has already hardened, let it wear off naturally over a few days as dead skin cells flake away, or use a skin-safe industrial hand cleaner.
Eye contact is more serious. If liquid glue splashes into your eye, flush it with clean, lukewarm water for at least 20 minutes. Remove contact lenses first if you’re wearing them. Don’t rub the eye, and don’t apply anything other than water or saline. Seek emergency medical care right away, as the glue can bond to the surface of the eye and cause lasting damage if not treated quickly.
The Danger to Dogs and Cats
Gorilla Glue is one of the more dangerous household products a pet can get into. Dogs are especially prone to chewing on the bottle, attracted by the sweet smell of the adhesive. The same expansion that happens in a human stomach happens in a dog’s, and their smaller digestive tracts make obstruction even more likely.
A study of 22 cases of Gorilla Glue ingestion in dogs found that vomiting was the most common sign, with pets typically showing symptoms about 42 hours after swallowing the glue. Nearly all of the dogs required surgery to remove the hardened mass from the stomach. The good news: dogs that received prompt surgical treatment had very good outcomes. If your pet gets into Gorilla Glue, don’t wait for symptoms. Contact your veterinarian or an animal poison control hotline immediately.
Is Cured Gorilla Glue Safe?
Once Gorilla Glue has fully hardened, it is no longer chemically active. The isocyanates have reacted and are locked into the cured polymer. Touching or even accidentally swallowing a small flake of dried glue from your skin has not been shown to cause problems or form obstructions. The glue is only dangerous in its liquid, uncured state when it can still react with moisture and expand.
This means a repaired mug or a glued cutting board isn’t releasing toxic fumes into your home. The hazard window is during application and the curing period, which typically lasts 24 hours for original Gorilla Glue.
Gorilla Super Glue Is a Different Formula
It’s worth noting that Gorilla Super Glue is not the same product as original Gorilla Glue. Super Glue uses cyanoacrylate, the same compound found in Krazy Glue and most instant adhesives. Cyanoacrylate doesn’t expand in the stomach and isn’t classified the same way for inhalation hazards. Its main risk is bonding skin, lips, or eyelids together on contact, along with mild irritation. It’s still not something you want to swallow, but it doesn’t carry the same expansion and obstruction danger as the polyurethane original formula.
If you’re trying to figure out which Gorilla Glue product you were exposed to, check the label. The original polyurethane formula comes in a brown bottle. The Super Glue comes in a smaller tube or bottle and is typically labeled clearly as “Super Glue.”