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ALPHA CHEM-554 Silicone Stopper
Silicone Stopper Translucent, highly elastic, odourless, suitable for use over a temperature range -50 to 250C, can be sterilized by steam or by hot air.
ALPHA CHEM-558 Rubber Stopper
Rubber Stopper One Hole One Hole, superior quality rubber resistance to acid, alkali and ammonia.
Rubber Stopper Two Holes Top Diameter: 17 mm. Bottom Diameter: 13 mm. Developed for demanding laboratory work. Soft, pliable, resilient, low in free sulfur, resistant to chemical attack. Made of black or blue rubber. Size numbers are molded into the top. All stoppers are 25 mm long. Accepts 4 mm tubing.
ALPHA CHEM-559 Rubber Stopper Solid Rubber Stopper Solid Solid, superior quality rubber resistance to acid, alkali and ammonia.