What is a test tube cap?
A test tube cap is a closure used to seal the opening of a test tube, protecting its contents from contamination, evaporation, or spillage. These caps can be made from various materials, such as plastic, rubber, or silicone, and come in different designs, including snap-on, screw-on, or push-in types.
What is a septum on a bottle?
A septum on a bottle is a rubber or silicone seal typically fitted into the cap or closure of the bottle. It allows a syringe or needle to access the contents without fully opening the bottle, preserving a sterile environment and preventing contamination. Septa are commonly used in lab bottles or vials to store sensitive materials, such as reagents, chemicals, or biological samples. The septum reseals after the needle puncture and ensures the contents remain uncontaminated even after multiple uses.
What do test tubes with screw caps do?
Test tubes with screw caps securely seal the contents inside, providing a tight closure that prevents leakage, contamination, evaporation, or spillage. Screw caps create a strong seal, making test tubes ideal for storing, transporting, and mixing liquid or solid samples. Lab and healthcare professionals use them when handling volatile, sensitive, or hazardous substances, as the cap helps maintain the sample's integrity and prevents exposure to the external environment.