STIRRING RODS: Glass, Polypropylene

STIRRING RODS: Glass, Polypropylene

•  Glass and polypropylene stirring rods for use in the science laboratory.
•  A stirring rod is used to mix liquids or solids and liquids together.
•  When decanting supernatants, stir rods are utilized as part of correct laboratory technique because the contact serves to negate the adhesion between the side of the glassware and the supernatant, which is responsible for the liquid pouring down the side.
•  Using a stirring rod also allows for greater control over the velocity of flow, which is critical in situations where chemicals may react violently.
•  This method is also used to transfer liquid from a large-mouthed flask or beaker into a test tube.
•  Stirring rods can also be used to scratch the interior surface of a test tube or beaker to generate crystallization in a recrystallization operation.
•  They can also be used to break apart an emulsion during extraction.

(Wikipedia excerpt: .."...A glass stirring rod, glass rod, stirring rod or stir rod is a piece of laboratory equipment used to mix chemicals. They are usually made of solid glass, about the thickness and slightly longer than a drinking straw,[clarification needed] with rounded ends.
Structure Stir rods are generally made of borosilicate (commonly known as Pyrex) glass or polypropylene plastic. They are usually between 10 and 40 centimeters in length and about half a centimeter in Ø . Glass rods are created from a single length of thin glass that is then cut into smaller segments. The ends are generally rounded (for example, by flame polishing) to prevent scratching the surface of glassware during use, which may lead to cracks if the glassware is later heated.[1] Other shapes are possible, such as a flat paddle which can be used to circulate sediment, a triangular paddle to imitate a rubber policeman or a round button used to crush solids.[2][3] ....")

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