Designed for reliable filtration in science classrooms, these Johnson wet-strengthened filter papers are ideal for practical experiments in primary, secondary, and college settings. Their medium flow rate and high mechanical strength make them suitable for a range of laboratory tasks, including filtering strong alkaline or acid solutions.

• Pack of 100 qualitative filter papers
• 150mm diameter, grade 321
• Thickness: 0.19mm
• Pore size: 4–7µm
• Made from majority alpha-cellulose for fibre-free filtration
• High wet strength for residue removal with spatula or water jet