Learn how to make slime with borax using just a few simple ingredients! This easy borax slime recipe creates stretchy, satisfying slime that’s perfect for sensory play, STEM activities, classroom science, and hands-on chemistry fun.
Whether you are brand new to slime-making or troubleshooting slime problems, this guide will show you exactly how to make borax slime successfully every time.
💡 Explore all of our homemade slime recipes here and find the most popular slime recipes for kids.
Why Use Borax to Make Slime?
Borax slime is one of the original homemade slime recipes and still one of the best ways to make stretchy slime. Borax powder creates a strong slime activator that helps turn glue into a smooth, stretchy polymer.
You can easily adjust the slime texture depending on:
- the type of glue you use
- the amount of activator
- how long you knead the slime
💡 Borax slime is also an excellent way to explore chemistry concepts with kids.
Supplies to Make Borax Slime
- 1/4 tsp borax powder
- 1/2 cup white or clear school glue
- 1 cup warm water, divided
- Food coloring, glitter, or confetti (optional)
- 2 bowls
- Spoon
- Airtight container
💡 Borax powder is usually found in the laundry aisle.
How to Make Slime with Borax
STEP 1: Make the Borax Solution
Mix 1/4 tsp borax powder into 1/2 cup warm water.
Stir until dissolved.
STEP 2: Prepare the Glue Mixture
In a separate bowl, combine:
- 1/2 cup glue
- 1/2 cup warm water
Add food coloring or glitter if desired.
STEP 3: Combine the Mixtures
Slowly pour the borax solution into the glue mixture while stirring.
The slime will begin forming immediately.
STEP 4: Knead the Slime
Remove the slime from the bowl and knead with your hands until smooth and stretchy.
The slime may feel stringy at first, but kneading improves the texture.
💡 Slime stretches best when pulled slowly instead of quickly.
Helpful Slime Tips
- Store slime in an airtight container.
- Add activator slowly.
- Knead before adding extra borax solution.
- Clear glue creates stretchier slime.
- White glue creates thicker slime.
Borax vs Saline Solution vs Liquid Starch
There are several popular ways to activate slime.
Borax Powder
Creates stretchy, durable slime and works especially well for slime science activities.
Saline Solution
Easy to use and commonly used for fluffy slime recipes.
Liquid Starch
Creates soft slime with a slightly different texture.
👉 Learn more about slime activators here.
Explore Slime Science
Want to take slime-making further?
Grab our free Slime Science Starter Lab to explore polymers, slime activators, non-Newtonian fluids, and hands-on slime investigations.
Includes:
- STEM challenges
- Observation pages
- Slime science
- A 5-day slime chemistry lab
👉 Download the Free Starter Lab
Troubleshooting Borax Slime
Why is my slime too stiff?
Try using less borax solution. Start small and add activator gradually.
Why is my slime sticky?
Sticky slime usually needs more kneading or a tiny bit more activator.
What is the best borax-to-water ratio?
1/4 tsp borax to 1/2 cup warm water is a great starting point.
How long does borax slime last?
When stored in a sealed container, borax slime can last for several weeks.
Can you make slime with clear glue?
Yes! Clear glue creates stretchier and more transparent slime.
💡 Read more about how to make slime less sticky here.
The Science Behind Borax Slime
Slime is a polymer created when glue reacts with borate ions from borax powder.
When the borax solution mixes with the glue, the long polymer chains in the glue begin connecting together through a process called cross-linking. This changes the glue from a liquid into a stretchy slime.
Slime is also considered a non-Newtonian fluid because it behaves like both a liquid and a solid depending on how much force is applied.
Borax slime is a great hands-on way to explore:
- polymers
- viscosity
- elasticity
- states of matter
- non-Newtonian fluids
💡 Read more about slime science and polymer chemistry here.
More Borax Slime Ideas
Looking for More Homemade Slime Recipes?
Explore all our homemade slime recipes, including fluffy slime, butter slime, cloud slime, clear slime, glitter slime, and more.
👉 Browse the Homemade Slime Hub
Extend the Learning with Slime
Our printable Slime Activity Pack includes step-by-step recipes, observations pages, challenges, and science extensions — perfect for home or classroom use.
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