This mixed bundle of rubber stoppers is ideal for science experiments in primary, secondary and college settings, helping teachers securely seal laboratory glassware. Designed for versatility, the pack includes a range of sizes and types to suit various practical needs.

• Pack of 50 rubber stoppers in assorted sizes and types (solid, one-hole, two-hole)

• Made from high-quality red rubber with Shore hardness 46–55

• Resistant to dilute acids, alkalis and ammonia

• Temperature range: -30°C to 70°C

• Please note: Extreme care must be used when inserting glass into the holes in rubber stoppers.  

• Pack of 50. Includes packs of 10 stoppers of each of the following sizes:

  • Solid: 13 x 16mm

  • Solid: 19 x 22.5mm

  • Solid: 31 x 36mm

  • One Hole: 19 x 22mm

  • Two Hole: 31 x 36mm