KPG stirrer

from Wikipedia, the free encyclopedia
KPG stirrer in a three-necked flask, stirrer motor coupled at the top by means of a rubber hose piece

The KPG stirrer (from Kernziehes Präzisions-Glasgerät ) is a glass device that is used in chemical laboratories to stir liquids, primarily for synthesis .

construction

A KPG stirrer consists of a precision tube (stirrer sleeve) and a stirrer shaft of exactly the right diameter (core, tolerance ± 0.01 mm) with a standardized precision cylindrical bevel about 10 cm long . Due to the complex production, the stirrers are correspondingly expensive. KPG stirrers must be well lubricated with a sufficiently viscous lubricant, such as castor oil . In the presence of fat dissolving agents, Kapsenberg smear should be used. The KPG stirrer is vacuum-tight, so it is possible to evacuate the apparatus. The abrasion of the glass is high, a number of revolutions is less than 600 min to increase the lifetime -1 recommended. KPG stirrers are used instead of magnetic stirrers if the equipment is not accessible from below, the viscosity of the medium is too high, (partially) suspended solids are used or a high stirring speed has to be achieved.

Individual evidence

  1. ^ Walter Wittenberger: Chemical laboratory technology. 7th edition, Springer-Verlag, Vienna / New York, 1973, p. 270, ISBN 3-211-81116-8 .
  2. ^ Heinz GO Becker, Werner Berger, Günter Domschke: Organikum . 22nd edition. Wiley-VCH, Weinheim 2004, ISBN 3-527-31148-3 .

Web links