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Transfer pipettes or plastic Pasteur pipettes Plastic Pasteur pipettes, also referred to as, have their stems and bulbs in the form of a single piece made of plastic. There are different sizes. The volumes are usually marked on the stem, though the markings are rather crude and are not particularly accurate.

Plastic Pasteur pipettes are often used in biology where most media are aqueous, and solvent resistance is not important. Most organic solvents, such as hexane and acetone, cannot be used in plastic Pasteur pipettes. They dissolve the plastic in these instruments, rendering them inadequate for many types of applications. The pipettes are also hard to wash, and are usually discarded with other biohazard waste after each use.

Plastic bulb pipettes are generally not precise enough to be used for exact measurements, whereas their glass counterparts can be extremely precise. The longer and thinner the tip of a glass pipette, the more exact the measurement. Usually they will be used in conjunction with a scale.

Structure and uses of transfer pipette
Disposable pipette: this type of pipette is design as one piece. It made up of polyethylene it have the bulb area at the bottom which can use to store the chemical by heat seal. this type of pipette is use to transfer fix volumn of chemical depend on it size.