High Quality Solid Rubber Stoppers for Laboratory Use

Laboratory grade solid black rubber stopper. Made of dense, soft natural rubber with low sulfur content. Creates a tight seal for test tubes, flasks and other laboratory glassware.

• Remains pliable over a great period of time
• Perfect for use with non-aggressive or concentrated solutions
• Withstand temperatures from –25 to 70°C (–13 to 158°F)
• Each stopper has the size number in raised letters on the top
• Resilient