Rubber Stoppers / Rubber Bungs – Solid, Pack of 10 (25 mm Bottom)

These Solid Rubber Stoppers are high‑quality, chemical‑resistant bungs designed for everyday laboratory use. Each stopper features a bottom diameter of 25 mm, tapering to a top diameter of 28 mm, with a length of 28 mm—making them suitable for sealing a wide range of flasks, boiling tubes, and laboratory vessels. Supplied in packs of 10, these stoppers offer excellent durability and a secure, leak‑resistant seal for practical science activities.

Constructed from strong, flexible rubber, they provide reliable performance and stand up well to repeated use and routine chemical exposure, making them ideal for busy school science environments.

Key Features

• Pack of 10 solid rubber bungs
• Bottom diameter: 25 mm
• Top diameter: 28 mm
• Length: 28 mm
• Durable, flexible, and chemically resistant
• Provides a tight, secure seal for various laboratory glassware
• Suitable for daily use in school science laboratories

Ideal for School Science Lessons

Well suited for KS3–KS5 chemistry, these solid rubber stoppers are perfect for:

• Sealing flasks, test tubes, and chemical reaction vessels
• Preventing gas escape during controlled reactions
• Safely storing solutions or samples
• Hands‑on experiments involving heating, mixing, or containment

A reliable, essential component for any school lab, offering consistent performance across a wide range of practical activities.