Korth Kristalle GmbH

Refractive Index

1: Gas cell | 2: Cuvette | 3: Parts of a Cuvette

Measuring Cells and replacement parts for the analysis of liquids and solids

We offer a large assortment of ATR-crystals for use in the field of spectroscopy.

We also offer both dismantleable and sealed cuvettes. For decades, cuvettes have been used for the optical analysis of liquids, oils and pastes. Cuvettes consist of a metal frame and two crystal windows (sometimes Fused Silica windows). The substance to be measured is held between the two windows. To prevent any leakage all lead seals are covered with an amalgamating solution. Where the substance to be measured is viscous, seals made of Teflon are sufficient. The thickness of the substance to be measured is adjusted using a spacer.

We can construct the cuvettes in house to your specification or supply the parts, allowing you to assemble the cuvettes using the following Instructions


We primarily use Teflon seals for dismantleable cuvettes, as these are easier to handle and simple to disassemble. Sealed cuvettes with a pre-determined depth are sealed using lead seals, which are then covered in an amalgamating solution. The seals are then checked and the exact depth of the cuvette measured with the spectrometer.

We have spacers in the following standard sizes:

(other dimensions on request)


22 mm x 38,5 mm

Teflon: 100, 170, 200, 500, 1000 μm 

Lead: 50, 75, 100, 150, 175, 200, 500, 6000 μm