Pasture Pipette

Plastic Pasteur pipettes, also referred to as transfer pipettes, have their stems and bulbs in the form of a single piece of moulded plastic. There are many generic and brand names on the market, but they are all manufactured by the blow moulding process. The mould releases the item and often it is trimmed to remove any excess plastic from around the seam.A tube of molten LDPE is extruded and the metal mould (made in 2 halves) closes around the plastic, whilst a jet of air under pressure is blown into the plastic to force it to expand to the shape of the mould. Disposable plastic Pasteur pipettes are made in a range of designs and sizes, each one adapted to perform a particular application in the laboratory, though many have numerous applications. They can include graduation markings for approximate volume measurements. Plastic pipettes are mainly used in biological and medical applications where most liquids used are aqueous, and solvent resistance is not important. They are not suitable for use with organic solvents, such as hexane and acetone which would dissolve the plastic.