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Test Tube

Test Tube

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Table of Test Tube Descriptions and Specifications

Feature            DescriptionSpecifications/Types
MaterialBorosilicate glass, Soda-lime glass, or Plastic (Polypropylene, Polystyrene).Glass: Withstands up to \(500^{\circ }\text{C}\); Plastic: Generally for low temperatures/disposable.
Shape/BottomCylindrical body, rounded or flat bottom.Round bottom (most common), Conical (for centrifuges), Flat bottom (for standing).
Top FinishTop often features a flared lip or is finished smooth.With Rim (for easy pouring/clamping), Rimless (for plugging/sterilization).
SizesVaries by application, ranging from small to large.Typical: 10x75mm, 13x100mm, 16x150mm, 18x150mm, 25x150mm (Diameter x Length).
VolumeCapacity ranging from micro to large.Typical capacities: 1 mL to 50 mL+. Durham tubes are \(<2\text{mL}\).
UsageReusable (Glass) or Disposable (Plastic).General Lab use, Chemistry reactions, Microbiology cultures, Blood/Sample collection.
Common FeaturesSome have markings for identification.White enamel marking area, screw-cap (with rubber or PTFE gasket), sterile or non-sterile.

Common Types of Test Tubes

  • Boiling Tube: A large, thick-walled tube used for boiling liquids, typically \(50\text{mm} \times 150\text{mm}\).
  • Culture Tube: Often made of borosilicate glass, used in microbiology to hold and grow microorganisms.
  • Centrifuge Tube: Conical-bottomed tubes designed to withstand high centrifugal forces.
  • Ignition Tube: A very small test tube used to perform chemical reactions on a small scale. 
$ 0.73 $ 0.74

 

Component/Feature         Specification
Size/Scale Diameter6 inches (150 mm) or 7 inches (175 mm/178 mm)
Vernier Reading1 minute of arc (30 seconds also common)
Main Scale0-360° with divisions of (0.5  circ ) (150 mm or 175 mm circle)
Vernier ScaleDouble ended vernier separated by (180 circ )
Collimator LensAchromatic, 178 mm focus, 32 mm clear aperture
Telescope LensAchromatic, 178 mm focus, 32 mm clear aperture
EyepieceRamsden Type ((10 times ) or (15 times ) with cross-line graticule
SlitUnilaterally adjustable, 6mm long
Fine AdjustmentProvided for both telescope and collimator (laterally and vertically)
Prism TableMarked with lines; leveling screws & interchangeable clamp
Main StructureHeavy cast metal with bright plated fittings (sometimes stainless steel scale)
AccessoriesPrism holder, Grating holder, Watchmaker’s eyeglass, L-key, Hardwood case



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