EXPERT AND SAMPLER FOR METALS- SCRAP METALS- RESIDUES and RECYCLING MATERIALS, publicly appointed and sworn by the Chamber of Industry and Commerce in Dortmund


The basis for the work of members of this profession was established around 100 years ago, when the metallurgical works and the Association of German Metal Traders initiated the public swearing in of experts.

Our company is already in the fourth generation and guarantees proper sampling, expert examination and analyses.

Based on the extensive experience of our employees, who have been with the company for many years, we provide our customers with a reliable service and cater to their individual needs. The samplers and our laboratory technicians are trained at our own company. This enables a prompt and efficient implementation and processing of customer assignments. Analyzes are made in our own, independent laboratory.

Günther GmbH is a team of samplers and laboratory technicians with professional expertise.

December 16th, 1910

Public appointment of Mr. Wilhelm Klute as metal sampler by the Chamber of Commerce in Berlin.

December 1st, 1922

Public appointment of Mr. Wilhelm Klute jun. as metal sampler by the Chamber of Commerce in Berlin.

July 31st, 1974

Public appointment of Mr. Hans-Joachim Günther as expert and sampler for ores, metals, scrap metals and residues by the Chamber of Commerce in Dortmund.

February 13th, 2012

public appointment of Mr. Alexander Günther as an expert and sampler for metals, scrap metals, residues and metallic recycling material

Sampler card


25 years membership in VDM (Union of metaltraders)


It is our task to sample and evaluate non-ferrous metals, alloyed steel, electronic scrap containing precious metals, residues and all other recycling materials.

Proper sampling and valuation is extremely significant because it cannot be repeated any number of times, as it is the case with sample analysis. This is why the right “mixture” of the sample is important!

The objective and purpose of sampling is to remove a representative quantity of a substance from the total quantity. This sample must deliver results that apply to the total quantity of the substance in terms of variables to be measured or evaluated.

As specialists, we assure reliable performance in accordance with the practices of the metal trade. We are competent representatives of the metal trade in the filed of sampling and analysis at smelting works. We also independently ascertain for contracting parties, vendors and purchasers.

  • metal content through sampling and analysis
  • moisture-, oil-, iron- contents and fine fractions
  • metal yield and -output
  • metal content through evaluation/ estimation
  • metal content through spectral analysis
  • precious metal determination by ICP

Our portfolio of services also includes expert opinions in respect of

  • sampling at a contractually stipulated location, such as a port or warehouse
  • ascertaining the quality of materials with binding conclusions
  • physical audits within the scope of inventory taking


Our chemical-metallurgical laboratory has also been available for decades as a reliable partner to members of the trade.

Our service includes the:

  • chemical analysis of metals and metal alloys
  • chemical analysis of residues, such as ashes, dross, slag,dust, sludge and catalysers
  • precious metal analysis with docimastic preparation
  • spectral analysis
  • eluate and hazardous goods analysis
  • determination of moisture and burning loss
  • mechanical processing and melting of samples for the analysis

Analysis of samples that are sent in, exchange analysis and arbitrational analysis are performed at our own laboratory. We also perform informative analysis as required, which assist us in the proper and precise implementation of sampling.


Office hours: Monday – Friday 8.30 a.m – 5.00 p.m


Mail address

Günther GmbH
Postfach 10 14 44
44014 Dortmund

Office address

Günther GmbH
Luisenstraße 12
44137 Dortmund

Laboratory address

Chem.-metallurg. Laboratorium
Dammstraße 42
44145 Dortmund

Company owner / Managing director:
Alexander Günther

Kathrin Bochannek
FON +49 (0) 231 628585-10

Endila Günther
FON +49 (0) 231 628585-12

FON +49 (0) 231 628585-0

FAX +49 (0) 231 628585-49



FON +49 (0) 231 628585-50

Miriam Boche

FON +49 (0) 231 628585-11