Visking Tubing – Size 4, 30 Metre Continuous Roll

This high‑quality Visking Tubing (Size 4) is supplied in a 30‑metre continuous length, making it ideal for repeated use across school science laboratories. Used widely to demonstrate dialysis, diffusion, and osmosis, Visking tubing acts as an effective semi‑permeable membrane, allowing small molecules to pass through while retaining larger ones. This makes it perfect for modelling biological processes in a clear and engaging way.

Size 4 tubing offers a larger working diameter, with an inflated diameter of approximately 17.5 mm and a flat width of 29–31 mm. This makes it especially useful for experiments requiring greater volume or easier filling and tying. Flexible and easy to cut, the tubing supports a wide range of practical activities in the biology curriculum.

Key Features

• 30‑metre continuous roll – perfect for frequent classroom use
• Size 4 Visking tubing for larger‑scale demonstrations
• Inflated diameter: approx. 17.5 mm
• Flat width: 29–31 mm
• Acts as a semi‑permeable membrane for dialysis and diffusion studies
• Durable, flexible, and simple to prepare
• Suitable for a wide variety of biology experiments

Ideal for School Science Lessons & Biological Investigations

This Size 4 Visking tubing is ideal for KS3, GCSE, and A‑Level Biology, helping students explore key concepts in membrane transport and molecular movement. Its larger size makes handling easier and supports more complex or extended investigations. It is excellent for:

• Demonstrating diffusion and osmosis through a selective membrane
• Simulating kidney dialysis and excretion processes
• Exploring molecular size and selective permeability
• Creating dialysis “bags” for comparative and multi‑variable experiments
• Teaching how concentration gradients drive natural biological processes

Reliable and versatile, this 30m roll of Size 4 Visking tubing is an essential resource for bringing core biological concepts to life in the classroom.