Round-bottom flasks (also called round-bottomed flasks or RB flasks) are types of flasks having spherical bottoms used as laboratory glassware, mostly for chemical or biochemical work. They are typically made of glass for chemical inertness; and in modern days, they are usually made of heat-resistant borosilie glass. glass.
At the opening(s) at top of the neck of some glass flasks such as round-bottom flasks, retorts, or sometimes volumetric flasks, there are outer (or ) tapered (conical) ground glass joints. Some flasks, especially volumetric flasks, come with a laboratory rubber stopper , bung , or cap for capping the opening at the top of the neck.
Choose by Neck Size Choose glass bottles and containers by the neck size or closure size. This is useful for people who already have bottle caps and need to find a container that fits a specific closure such as 38-400. Closure sizes can be written with either a
Glass dropper bottle choices include:aer, blue/cobalt, clear/flint, and green. Of these options, aer is best if you are concerned about ultraviolet protection. The other colors have become popular because most glass bottles are stored in a dark environment––so UV protection is not usually a top concern.
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If the pipette is to be reused (for example is the designated pipette for a reagent bottle), the pipette should be held so it does not touch the glassware, where it may become contaminated by other reagents in the flask (Figure 1.20d).
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Reagent bottle caps are commonly said to be "autoclavable". Antique or vintage reagent bottles tend to resele the classic apothecary bottle and have a glass stopper, very often not of standard size, so that very old bottles and samples should be stored with care, as replacing a missing glass stopper would require dedied glassworking.
volume 2 mL, clear glass vial (standard opening 4.6 mm), O.D. × H × I.D. 12 mm × 32 mm × 4.6 mm, red PTFE/white silicone septum Supelco pricing SDS 27136 volume 4 mL, clear glass vial, O.D. × H 15 mm × 45 mm, tan PTFE/silicone septum
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Select the Nalgene dilution bottle that works for you Nalgene dilution bottles make 1/10 and 1/100 dilutions simple. Graduated at 90mL and 99mL, with plenty of head space for reagent additions after dilution, often eliminating the need to transfer diluted samples …
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