Home - homepage of Dr. Dietmar Glindemann

Home(English)     Business products:
-Glindemann PTFE Sealing Rings
-Gastight Allglas-Syringes with
Academics - Scientific Publications Dietmar Glindemann
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Last Update January 23, 2019        WEBCounter by GOWEB People visited this site
Internet domains of Dr. Dietmar GLINDEMANN: www.glindemann.net www.phosphine.net,   www.taperjoints.eu


Worldwide customers:
Glindemann PTFE Sealing Rings
are sold worldwide
by Sigma-Aldrich
in 200 countries
search for "glindemann")


by Carl Roth in 140 countries (not in North America).

See table of catalogue numbers of major distributors

Please contact Dr. Glindemann for Glindemann rings if you currently experience ordering problems with our distributors.

Greaseless high-vacuum seal for conical glass joints.

Download PDF Technical Publication 1 (published in journal Fusion of the American Scientific Glassblowers Society ASGS).
Download PDF Technical Publication 2 (Flyer with Tips and Tricks)

For sale are PTFE-sealing rings, 50 rings on a PP-adapter tube per package.
PTFE (polytetrafluorethylene) is equivalent to Teflon® from DuPont.
Lowest prices in Europe and Australia:
Glindemann PTFE Sealing Rings
for as low as 15.41 €/pack of 50 rings (August 2016).
Lab Logistics Group LLG's partners in all European countries

Mercateo (a partner of LLG)  in all European countries http://www.mercateo.com/p/163-9011664/Dichtringe_fuer_Kegelschliffe_PTFE_NS_14.html

As low as 21.28 €/pack (for minimum 4 packs, or 17,42 €/pack (for minimum 40 packs) (Aug. 2016)

For sale are PTFE-sealing rings, 50 rings on a PP-adapter tube per package.
PTFE (polytetrafluorethylene) is equivalent to Teflon® from DuPont.
Glindemann Gastight Allglas-Syringes (glass syringes) with PTFE-Sealing Ring
are sold by Dr. Dietmar Glindemann

Please contact Dr. Glindemann at dglinde@aol.com for sizes and a quotation.

For hermetic handling of chemicals and environmental samples, syringe pump operation and cold storage.

For sale are gastight allglass-syringes, improved with an additional PTFE sealing ring in an additional groove; and replacement sealing rings.
Goettinger Bogen 15
D-06126 Halle
ph  +49-(0)345-6879948,
fx +49-(0)345-6871333.
Internet :


Please contact Dr. Glindemann at  if you currently experience ordering problems with our distributors of Glindemann-rings.


Schlenk techniques - Example uses of Glindemann-ring (PTFE sealing ring) for conical joint of Schlenk-flask with air- and moisture-sensitive chemicals

Chernichenko, K. et al. Hydrogen activation by 2-boryl-N,N-dialkylanilines: a revision of Piers’ ansa-aminoborane. Dalton Trans., 2012, 41, 9029-9032, DOI: 10.1039/C2DT30926B, see Electronic Supplementary Material file: http://www.rsc.org/suppdata/dt/c2/c2dt30926b/c2dt30926b.pdf.

Chernichenko, K. et al. A frustrated-Lewis-pair approach to catalytic reduction of alkynes to cis-alkenes. Nature Chemistry 5, 718–723 (2013), doi:10.1038/nchem.1693, see Electronic Supplementary Material file: http://www.nature.com/nchem/journal/v5/n8/extref/nchem.1693-s1.pdf.

Chernichenko, K. et al. Metal-Free sp2-C–H Borylation as a Common Reactivity Pattern of Frustrated 2-Aminophenylboranes. J. Am. Chem. Soc., 2016, 138 (14), pp 4860–4868, DOI: 10.1021/jacs.6b00819, see Electronic Supplementary Material file: http://pubs.acs.org/doi/suppl/10.1021/jacs.6b00819/suppl_file/ja6b00819_si_001.pdf.

Wipf, P. (2014) Techniques for Handling Air- and Moisture-Sensitive Compounds. See at http://ccc.chem.pitt.edu/wipf/Web/Air_sensitive_techniques.pdf .

Knudsen, B. P., Chorkendorff, I., & Stephens, I. (2016). Synthesis of Platinum Rare Earth Alloy Catalysts for Fuel Cells. Department of Physics, Technical University of Denmark. http://orbit.dtu.dk/files/127670440/Brian_Knudsen_PhD_Thesis_v1_reduced..pdf


Schlenk flask greasefree with Glindemann-ring PTFE (polytetrafluorethylene, equivalent to Teflon® from DuPont). Store or freeze air- and moisture-sensitive chemicals. Stop contamination and leakage by leached-out joint-grease. Improved analytical crystallization, undisturbed by grease contamination of analyzed chemical.

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Short description of  the Sealing-Ring-Business  of Dietmar GLINDEMANN (efficient and economical PTFE Sealing Ring for conical glass joints)
Laboratory work with chemical glass equipment and containers often demands hermetic and clean sealing of conical joints and stoppers. Joint grease is not solvent resistant and not clean. The known PTFE-joint sleeves and stoppers are expensive and not very tight. Therefore, a fine PTFE-ring seal on ground tapered glass joints has been developed. The ring is inexpensive, gas-tight, solvent-tight, chemically inert, temperature resistant and prevents freezing of joints. Estimated 1.5 million seals have been tested on the market in the last years.
Production: Dietmar Glindemann.
To see a list of distributors of GLINDEMANN® sealing rings and their catalogue numbers click on the "Business" part of this site.
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Short description of  the academic scientific work of Dietmar GLINDEMANN

Physicochemistry (separation, distillation, chromatography)
Trace analysis of volatile toxins, odorants containing heteroelements (sulfides, phosphine, organophosphines and other organoelement compounds)
Advanced gas chromatographic trapping techniques
GC-ICP interface construction
Odor research - chemical analysis of odorants, odor measurement by olfactometry, odor evaluation
DMSO (dimethyl sulfoxide) waste residues, DMSO reduction to dimethyl sulfide (DMS) and sewage plant odor

Learn about why metals smell metallic (metallic odor, iron odor, copper odor, odor of money, smell of money...          Link to the paper "The Two Odors of Iron..."
 Artwork: D. Glindemann / Angew. Chem.

(click to enlarge)

About www.phosphine.net

Applying a new developed gas chromatographic trace analytical technique we got extensive knowledge concerning the existence and formation mechanisms of phosphine in the earth’s environment. We discovered phosphine in waste gas, marsh gas, biogas, landfill gas, wetland sediment, soil, intestinal tract of mammals, faecal sludge, animal manure, landfill, technical metals, industrial waste, stone minerals, food and cosmic fall down. It was also found to be a global trace component of the earth’s atmosphere. Do not confuse phosphine (PH3) with phosgene (COCl2, Carbonoxidechloride, Carbonyldichloride, Carbonicaciddichloride).
Diphosphine (P2H4 , Diphosphane) a self igniting gas, was found in fermentation experiments using human feacal bacteria.
(Publication: Gassmann, G., Glindemann, D.: Phosphane in the Biosphere. Angew.Chem.Intern.Edit. 32 (1993) 761-763.). The results of this publication, phosphine and diphosphine, was discussed in various printed media (John Emsley) and TV media (US discovery channel...) as the igniter of methane gas in human flatus gas (to produce spontaneous human combustion (SHC), an appropriate term for this would be "ignis flatus") and in marsh gas (to form swamp lights named as Will o' the Wisp or "ignis fatuus". A biochemical pathway of how microorganisms could produce enzymes to reduce phosphate to phosphine is still not discovered.
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Glassblower Societies worldwide links

American Scientific Glassblowers Society
British Society of Scientific Glassblowers  
Belgische en Nederlandse Vereniging voor Glastechniek
German Scientific Glassblowers Society,   Verband Deutscher Glasbläser e.V  
Indian Society of Scientific Glass Blowers ( ISSG), Email issg_chennai@sify.com
Scientific Glassblowers Society of Australia and New Zealand (SGSANZ)
Scottish section of British Glass Society
Scottish Glass Society
Vereinigung Österreichischer Glasbläser
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Glass ground conical taper standard joint PTFE sealing ring seal, gasket, socket, sleeve, stopper, plug, leakage, vacuum, pressure, grease, jamming freezing, Schlenk techniques, Schlenk-flask, air sensitive chemicals, moisture sensitive chemicals,
Phosphine (CAS. 7803-51-2, PH3, Phosphane),  Diphosphine (P2H4 , Diphosphane) toxic, environment, marsh gas, biogas, landfill gas, wetland sediment, air, food, diphosphine spontaneous human combustion (SHC),  will o' the wisp, jack o' lantern,  Phosgene

organometallic, methyl mercury, dimethyl mercury (CAS 62-38-4, 593-74-8.), Organotin, tetramethyl tin (CAS 594-27-4),   trimethyl tin (CAS 1066-45-1), Tributyltin chloride ( CAS 1461-22-9), octyl  tin, phenyl tin, Tetraethyl lead (CAS 78-00-2),  Tetramethyl lead (CAS 75-74-1)