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How to make slime

Slime activity header

In this activity students will discover how a change in the structure of a molecule can change the physical properties. Students will mix PVA (Polyvinyl Acetate) with borax. The borax creates cross links between the PVA molecules. This extends the PVA molecules and result in the new substance having a firmer texture.


For faster results ask technicians to add the raw ingredients to the cup with a stirrer. This allows students to simply stir and observe the changes.

Activity steps
  1. Add 125ml PVA to the beaker.
  2. Add 2 teaspoons of borax.
  3. Mix with a stirrer.
  4. The mixture can become firm and hard, like the texture of fat. If the mixture becomes too thick, add up to two table spoons of water. This will give the desired slime texture, which can be stirred and poured easily.
  5. Add food colouring (optional).
Safety guidance
  • Borax is toxic and should not be consumed or touched with bare hands. If you come in contact with the mixture wash the exposed area immediately.

Ocean plastics sci 11 14 UNIT thumb

Science | Ages 11-14

Ocean Plastics

Ocean Plastics Science ages 11-14 unit is a KS3 teacher resource combining both biology and chemistry. Students discover the journey plastic takes from manufacture, use, and disposal into the ocean. Included are teacher resources that allow students to emulate real research conducted by The University of Plymouth.