The Pyrex 12 x 100 mm screw cap test tube (specifically Corning model 9825-13) is a professional-grade culture tube designed for laboratory applications requiring airtight seals and high thermal resistance. It is manufactured from Corning Code 7740 borosilicate glass, a Type I, Class A material recognized for its exceptional chemical stability and low expansion.
Core Specifications
- Dimensions: 13 mm outside diameter (O.D.) x 100 mm length.
- Capacity: Approximately 9 mL.
- Bottom Style: Round bottom.
- Thread Size: 13-415 GPI (Glass Packaging Institute) threaded neck.
- Closure: Deep-form black phenolic (Bakelite) screw cap with a white rubber liner.
Key Performance Features
- Superior Thermal Resistance: The tube can withstand repeated wet or dry sterilization cycles in autoclaves (up to
at 15 psi). It has a maximum thermal shock resistance of
.
- Chemical Purity: The borosilicate glass is highly resistant to water and acids, which prevents the leaching of contaminants that can alter the pH of sensitive biological cultures.
- Airtight Sealing: The deep-form phenolic cap provides a secure, leak-resistant seal, making it ideal for sample storage and transport.
- Integrated Marking Spot: Includes a permanent white enamel spot that allows for easy, erasable pencil notations
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