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Home (English)
Business: Glindemann Sealing Rings
Scientific Publications Dietmar Glindemann
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Japanese
日本語
GLINDEMANN®-sealing ring 
(PTFE)
for ground taper (conical) joints
Glindemann, Goettinger Bogen 15, D-06126 Halle,
Germany,
ph +49-(0)345-6879948,
fx +49-(0)345-6871333.
e-mail uwinator@aol.com Uwe Glindemann,
Internet : www.glindemann.net
Links in this site:
Distributors and catalogue numbers of Glindemann
Sealing Rings
Delivery and Prices of Glindemann Sealing Rings
Application: For what are Glindemann Sealing Rings
good for?
Procedure: Instruction on how to apply Glindemann Sealing Rings
Frequently asked questions and Know How on Glindemann Sealing Rings
Test reports on Glindemann Sealing rings (references)
Links on laboratory glass ware in the internet and to
www.glindemann.net:
| List
of distributors of GLINDEMANN® sealing rings
and their catalogue numbers (to find distributor addresses in single countries, see next table) |
|||||||||||
| Joint maximum diameter / mm | 7 | 10 | 12 | 14 | 19 | 24 | 29 | 34 | 45 | 70 | Distribution in |
| Glindemann No | K7 | K10 | K12 | K14 | K19 | K24 | K29 | K34 | K45 | K70 | |
| Number of Sealing rings / unit (pck) | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | |
| Distribution worldwide by
SIGMA-ALDRICH
(click link to find addresses for over 200 countries worldwide). Prizes up to 50% higher, but ordering is convenient in any country. |
|||||||||||
| ALDRICH | Z50,198-0
(Z501980) |
Z50,208-1 (Z502081) |
Z50,220-0 (Z502200) |
Z50,231-6 (Z502316) |
Z50,241-3 (Z502413 ) |
Z50,252-9 (Z502529) |
Worldwide 200 countries | ||||
| Distribution in USA, Canada, Mexico by Kimble-Kontes (order is possible from every major labware company such as VWR and Fisher Scientific, Aldrich) | |||||||||||
| Free samples in USA, Canada:
Call 1-888-546-2531
Kimble-Kontes, ask for Samples Joint Size 24, Catalogue number 676005-2440, or visit Kimble-Kontes at trade shows. |
|||||||||||
| KIMBLE-KONTES USA | 676005-9001 | 676005-1030 | 676005-1420 | 676005-1922 | 676005-2440 | 676005-2942 | 676005-4550 | America | |||
| VWR USA | KT 676005-1030 | KT 676005-1420 | KT 676005-1922 | KT 676005-2440 | KT 676005-2942 | KT 676005-4550 | America | ||||
| Fisher Scientific USA |
K 676005-1030 | K 676005-1420 | K 676005-1922 | K 676005-2440 | K 676005-2942 | K 676005-4550 | America | ||||
| Thomas Scientific USA |
676005-1030 | 676005-1420 | 676005-1922 | 676005-2440 | 676005-2942 | 676005-4550 | America | ||||
| ALDRICH | Z50,198-0
(Z501980) |
Z50,208-1 (Z502081) |
Z50,220-0 (Z502200) |
Z50,231-6 (Z502316) |
Z50,241-3 (Z502413 ) |
Z50,252-9 (Z502529) |
America | ||||
| Distribution in Australia and Europe | |||||||||||
| LABGLASS | GSR7 | GSR10 | GSR12 | GSR14 | GSR19 | GSR24 | GSR29 | GSR34 | GSR45 | GSR704 | Australia, Oceania |
| AJ Cope & Son Ltd, on-line shop Thelabwarehouse.com |
QZZ27/14 | QZZ27/19 | QZZ27/24 | QZZ27/29 | QZZ27/34 | QZZ27/45 | UK, Ireland |
||||
|
Carl Roth GmbH,
|
T221.1 | E699.1 | E700.1 | E701.1 | E702.1 | T222.1 | Europe |
||||
| Glass Solutions Ltd | K14 | K19 | K24 | K29 | K45 | UK, Ireland |
|||||
| Fisher-Scientific in Germany |
3391345 | 3391346 | 3391347 | 33901348 | 33901349 | 33901350 | 33901351 | 33901352 | 33901353 | Germany, Austria, Switz. | |
| Merck Eurolab in Germany VWR International Inc |
2016251 | 2016252 | 2016253 | 2016256 | 2016258 | 2016260 | 2016262 | 2016263 | 2016264 | 2016266 | Germany, Austria, Switz. |
| Quadrolab (LHU), link to 12 European countries | 9.011 663 | 9.011 664 |
9.011 665 | 9.011 666 | 9.011 667 |
|
|
Europe | |||
| LR. Vetter Laborbedarf e.K. | DKA-7 | DKA-10 | DKA-12 | DKA-14 | DKA-19 | DKA-24 | DKA-29 | DKA-34 | DKA-45 | DKA-70 | Germany |
| AMSI | 6.300.007 | 6.300.010 | 6.300.012 | 06.300.014 | 06.300.019 | 06.300.024 | 06.300.029 | 6.300.0344 | 6.300.045 | 6.300.070 | Switzerland |
| Addresses of distributors, in countries, worldwide, (to find catalogue numbers, see table above) |
||||
| Catalogues of company (click on links to see addresses) | Address |
Phone, Fax, e-mail | Catalogue
numbers (see table above) |
Country of Distribution |
| ALDRICH
(Sigma-Aldrich) Prizes about 50% higher, but ordering is convenient. Click link to find 200 countries |
ALDRICH | Worldwide, 200 countries, |
||
|
Quadrolab in UK,
Irleand |
The Oval, Hackney Road, London E2 9DU, UK | Ph: (0044) 0207 729 2405, Fx: (0044) 0207 729 2657, cjc@ajcope.co.uk | Quadrolab | UK, Ireland |
|
AJ Cope & Son Ltd,
on-line shop Thelabwarehouse.com |
The Oval, Hackney Road, London
E2 9DU, UK |
Ph: (0044) 0207 729 2405, Fx:
(0044) 0207 729 2657, cjc@ajcope.co.uk http://www.thelabwarehouse.com/home.html |
Quadrolab | UK, Ireland |
| Carl Roth in UK,
Ireland ROTEC SCIENTIFIC LTD. |
10, Bridgeturn Avenue, Old Wolverton, GB-Milton Keynes MK 12 5QL, UK | Ph: 01908 22 33 99, Fx: 01908 22 30 00, Sales@techmate.co.uk |
Carl Roth (ROTH) | UK, Ireland |
|
Glass Solutions Ltd. |
Unit 2 149b Histon
Road, Cambridge CB4 3JD |
Ph: (0044) 01223 301929, Fx: (0044) 01223 301623, enquiries@glass-solutions.co.uk | Glass Solutions Ltd. | UK, Ireland |
| Quadrolab in Austria Bartelt , Wagner & Munz Austria |
click link |
click link | Quadrolab | Austria |
| Carl
Roth in Austria LACTAN GesmbH & Co. KG |
Zinzendorfgasse 10-12, A-8011 Graz | Ph: 0316/32 36 92-0 Fx: 0316/38 21 60 Lactan.Labor@aon.at |
Carl Roth (ROTH) | Austria |
| LABGLASS |
24 Windorah St, Stafford, Brisbane, Queensland, 4053, Australia |
Ph:
++61(0)7-3356 8199 |
LABGLASS | Australia, New Zealand, Oceania |
| Quadrolab in Belgium Devos-Francois S.A. |
480, rue de Châtelet B- 6010 Charleroi, Belgium |
Ph: ++32(0) 71 440870 Fx: ++32(0)71 440890 e-Mail: mail@d-f.be | Quadrolab | Belgium |
| Carl Roth in Czechia - Ceska P-LAB A.S. |
Ricanska 10, CZ-10100 Praha 10 |
Ph: 02/171-380 00, -322 02, Fx: 02/171-311 76, info@p-lab.com | Carl Roth (ROTH) | Czechia - Ceska |
| Quadrolab in Denmark Bie & Berntsen , Buch & Holm |
click link |
click link | Quadrolab | Denmark |
| Quadrolab in Spain Serviquimia s.a. |
Pere IV 29-35, 5° 1°, E-08018 Barcelona, Spain | Ph: 0034 (0)93 3003493, Fx: 0034 (0)93 3003493, serviquimia@serviquimia.com | Quadrolab | Spain - Espagna - Portugal |
| Carl Roth in
Spain Carl Roth S.L. |
La Jota, 86, E- 08016 Barcelona | Ph: 93-3 52 60 61, Fx: 93-3 49 80 23, carl.roth@retemail.es | Carl Roth (ROTH) | Spain - Espagna Portugal |
| Carl Roth in France Roth-Sochiel S.A.R.L |
3, rue de la Chapelle/B.P. 11, F-67630 Lauterbourg, France |
Ph: 03 88 94 82 42 Fx: 03 88 54 63 93, sochiel@carlroth.de |
Carl Roth (ROTH) | France |
| Quadrolab in
France Sodipro S.A. |
42, rue Ambroise Croizat, BP 307, F-38434 Echirolles Cedex, France |
Ph: 0033 (0)4 7623 3927, Fx 0033 (0)4 7623 2412, sodipro.38@wanadoo.fr | Quadrolab | France |
| Fisher Scientific Germany | Im Heiligen Feld 17 58239 Schwerte |
Ph++49 (0)2304
/ 932-800 |
Fisher Scientific Germany | Germany, Austria, Switzerland |
| Merck Eurolab (VWR) | John Deere Str. 5, |
Ph++49
(0)7251/717-0 |
Merck Eurolab (VWR) | Germany, Austria, Switzerland |
| Quadrolab (LHU, Omnilab) Germany | Postfach 1416 |
Ph++49(0)2225-948690,
|
Quadrolab | Germany |
| LR. Vetter Laborbedarf e.K. | Herrenberger Str. 5, D-72119 Ammerbuch, Germany | Ph++49(0)7073/6936, Fx++49(0)7073/2740 | Vetter | Germany |
| Carl Roth GmbH, Germany | Schoemperlenstr. 3, D-76185 Karlsruhe, Germany |
Ph++49
(0)721/5606-0, |
Carl Roth (ROTH) | Germany |
| Quadrolab in Italy EXACTA + OPTECH labcenter s.p.a. | click link | click link | Quadrolab | Italy |
| Quadrolab in the Netherlands Boom B.V. |
P.O. Box 37 NL-7940 AA Meppel Rabroekenweg 20 NL- 7942 JE Meppel | Ph: ++31(0)522 268700 Fx: ++31 (0)522 260779 boombv@boomlab.nl | Quadrolab | Netherlands |
| LABGLASS |
24 Windorah St, Stafford, Brisbane, Queensland, 4053, Australia |
Ph:
++61(0)7-3356 8199 |
LABGLASS | New Zealand, Oceania |
| Quadrolab in Norway INSTRUMENT-TEKNIKK A/S BIOTEST (Member of the Bie & Berntsen-Group0 | Grini Naeringspark 1/PB 14 N-1332 Oesteraas (Oslo) | Ph: ++47 (0)671 49303 Fx: ++47 (0)671
49302 firmapost@instrument-teknikk.no |
Quadrolab | Norway |
| Carl Roth in Poland Linegal Chemicals Sp.z o.o. |
ul. Kasprzaka 44/52, PL-01-224 Warszawa | Ph: 022/632-32 21 w.-33 74,-31
92,-32 91, Fx: 022/631-72 81 |
Carl Roth (ROTH) | Poland - Polska |
| Quadrolab in Sweden Bie & Berntsen, Buch & Holm |
click link | click link | Quadrolab | Sweden |
| AMSI | Geismet 11, CH-4317 Wegenstetten AG, Switzerland |
Ph ++41-(0)61-8739093, Fx ++41-(0)61-8739094 | AMSI | Switzerland |
| KIMBLE-KONTES | 1022 Spruce Street, Vineland, NJ 08360 | Ph ++1-609-692-8500, Fx ++1-609-692-3242 | Kimble-Kontes | USA/Canada/Mexico |
| VWR USA | 1310 Goshen Parkway West Chester, PA 19380, USA |
Ph 1-800-932-5000, Phone: (610)
431-1700 Fax: (610)431-9174 |
VWR USA | USA/Canada/Mexico |
| Fisher-Scientific USA | Fisher Scientific Worldwide, Export Division, 50 Fadem Road, Springfield, NJ 07081-3193, USA | Phone:
1-973-467-6511, |
Fisher-Scientific USA | USA/Canada/Mexico |
| ALDRICH
(since September 2002) Prizes up to 50% higher, but ordering is convenient. Click link to find 200 countries |
ALDRICH | Worldwide, 200 countries |
||
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Delivery:
For taper joint sizes from 7 to 70 mm diameter.
1 unit of delivery = 50 sealing rings stored on a tube or cone matching the diameter of
the male joint part, in a labeled bag including information in several languages:
Foto:
made off PTFE
(known as Teflon) on ground tapered glass joints has been developed.
Delivery: 50 sealing rings on a tube, matching the diameter of the male joint part. |
 The sealing ring looks on good joints "tightly" like grease. |
Gently press the glass parts together.
The ring must look transparently "tight" all around. Do not break the joint by overstressing. For less smooth glass joints a miniscale amount of grease should be used. The parts of the joint can also be rotated and rubbed to produce microscopic PTFE-filings which smooth the glass.
Centre: Ring after pressing - transparently like grease. Under pressure the PTFE, although free of grease, flows like grease into the uneven surface of the ground joint
On the right: Compared to a greased joint, equally transparent. But grease is not solvent resistant and not very clean.
Disconnect the joint by moving one part of the joint back and forth (do not pull). With 2 rings extra motion.
Frequently asked questions and Know How on PTFE sealing rings for Taper Joints
QUESTION: Ordering. Where can I order these PTFE sealing rings? ANSWER: Search the list of traders at this homepage. If your home trader is not on the list ask him to manage to buy sealing rings from one of the listed traders for you.
QUESTION: Sizes. Are sealing rings available for all joint sizes? ANSWER: Yes. Rings are available for 5...70 mm taper diameter.
QUESTION: What is the price of these PTFE sealing rings?
ANSWER: The price is in Europe about 25 Euro per unit of delivery (50 rings). So one ring
is about 0,50 Euro.
QUESTION: How does the PTFE ring seal work?
ANSWER: The plastic PTFE (known as Teflon) of the sealing ring acts similar to joint
grease. But PTFE is much more clean and chemicly inert than joint grease. The PTFE flows
under high pressure slowly like grease or wax into the uneven spots of the ground
glass surface. By this cold flow the free leakage volume between the 2 joint parts is
filled and sealed by PTFE. PTFE is in fact much harder than grease or wax. To make PTFE
flowing like grease it must be under a very high pressure. This pressure is produced by
pressing the 2 glass joint parts together. But the force to produce this pressure is
applied to the PTFE and the glass as well. This force can break the female part of the
glass joint by tensile stress. But the glass is of course not allowed to break ever.
Therefore, the PTFE ring is shaped to contact the surface of the ground joint only at a
very small area (just the area of the 0,6 mm wide ring). If you force the 2 glass joint
part together they contact each other only via the small PTFE ring. This relatively small
force results therefore in a comparatively large deformation pressure on the PTFE. With
this theory on PTFE ring seals in mind you can use the following rules to use these rings
more efficient: Any factor which makes the PTFE more soft makes the seal better (high
temperature, presence of traces of plasticizers, solvents, water, grease). Any factor
which makes the ground glass surface more smooth makes the seal better (polishing of the
glass surface). Any factors which gives the PTFE more time to flow makes the seal better
(usually the final sealing is better a few hours after pressing the joint together).
QUESTION: I have doubts that PTFE can seal a glass joint properly. I
used PTFE-sleeves and found they have no sealing properties compared to a bare glass
joint.
ANSWER: The common PTFE sleeves which do not have sealing ribs have in fact no sealing
effect because they do not work like PTFE rings. PTFE sleeves cover the whole joint.
Therefore, the pressure on sleeves is too low to make the PTFE flowing like grease.
QUESTION: Sealing Containers. Can I use the PTFE sealing
rings to seal containers with glass taper stoppers? (Reagent tubes, flasks, erlenmeyer
flasks, bottles)
ANSWER: Definitely, this works great. You fill find, that the PTFE sealing ring will make
the glass stopper fixed in the container. Therefore, a slight overpressure in the bottle
will not push out the glass stopper. To loosen the glass stopper, do not pull the
joint parts apart because this needs too much strength. Instead, move the stopper to and
from several times or rotate one joint part.
QUESTION: I can not remove the stopper with a sealing ring from the joint or bottle. Why
are the glass joint parts with a sealing ring stuck if I try to pull them apart?
ANSWER: Do not pull the joint parts apart because this needs too much strength.
Instead, move the stopper to and from several times or rotate one joint part.
QUESTION: Can I use the ring more than one time?
ANSWER: Yes. The ring can be removed from one joint and can be transfered to another
joint. But scratches and dirt can make it less tight over the time.
QUESTION: How can I remove the PTFE sealing ring from the glass joint?
ANSWER: Just slip it off. The PTFE rings adheres to the male glass joint just by elastic
tension, which prevents the PTFE ring from falling of the male glass joint.
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QUESTION: Extra tight seal. I used a PTFE ring seal and found
the sealing not proper enough.
ANSWER:
Inspect the seal if it looks transparently "tight" all around the joint. If
there are "bad" looking spots (one millimeter is enough to cause leakage) then
the ring is probably scratched or dented.
Some times the surface of the ground joint is simply to rough to fit the PTFE ring seal.
There are different possibilities to smooth out the roughness of ground jointed glass
ware.
The joint with a PTFE ring seal can be rotated and rubbed to produce
microscopic PTFE-particles which smooth the glass at the PTFE-contact zone forever. This
zone of the joint looks like greased but it is in fact a layer of small PTFE particles
which fill out the uneveness of the ground glass. To make the smooth contact zone broader
move the PTFE ring on the joint and rotate the joint parts again. Remove larger visible
PTFE-fibres after this procedure. The PTFE-ring used for rubbing has to be sacrificed
often because it looses larger PTFE-particles which make the ring uneven.
Foto:
Extra tight seal.
Smooth a 2 mm zone of the male glass joint with PTFE filings from a ring by rubbing.
Sacrifice this ring used for rubbing. Slip a new PTFE Ring onto the smoothed zone. This
extra smoothing will result in an almost hermetic extra tight seal.
But you can of course use PTFE sealing rings without this procedure, for most purposes.
Another possibility is to soften the PTFE sealing ring. This can be performed by
applying a micro scale amount of grease or solvent or water.Do not clean
your jointed glass in Potassium Hydroxide solution which makes ground glass even more
rough. You can also ask your glass blower for slightly polishing the joints. A simple home
made fire polishing procedure is to direct a very hot welding flame (more than 2000oC)
for a few seconds (do not deform the joint) directly around the grounded glass surface.
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QUESTION: Extra clean work: How can I extra clean the PTFE ring for ultra clean
work (biochemical, pharmaceutical, analytical, organometal work) ?
ANSWER: You can either bake the ring or you can extract contamination with solvents.
Baking: The PTFE ring can be baked at 300 oC in an oven. But do NOT put the plastic
storage tube at heat over 100 oC! Slip the PTFE ring on a male glass taper
stopper to prevent it from shrinking .
Solvent extraction: You can bathe, purge or rinse the PTFE rings with any useful solvent
(PTFE takes any organic solvent). You can also put many PTFE sealing rings alltogether in
a Soxhlet Extractor and rinse them with the solvent, which has a boiling temperature below
70 oC (at higher temperature, the rings will start to shrink).
Take care, that this cleaning (baking or solvent rinsing) will make the PTFE less soft and
reduce the sealing power slightly. If you want to soften the PTFE ring again, you can add
a micro amount of any greasy, oily or slippery chemical which does not harm your
laboratory work.
QUESTION: How can I prevent that the sealing ring teared up and fell off the joint
after baking/heating over 200 oC?
ANSWER: Slip the ring before heating on the thinner part of the taper joint.
QUESTION: I took the ring off the joint and it contracted to be too
small to install it again on a taper joint.
ANSWER: You can stretch the ring to fit again the joint. Stretch the ring with a
storage cone which you bought together with the rings from your trader. You can also use
two fingers, sticks, nails etc.
Foto:
Sealing ring contracts (shrinks)
if removed from the joint.
QUESTION: The sealing ring became to large in diameter and fell off the
joint.
ANSWER: The diameter of the ring can be decreased by use of high temperature of 100...300
oC (oven, lighter, Bunsen burner).
Since September 2003
QUESTION:
ANSWER:
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Links on laboratory glass ware in the internet and to www.glindemann.net:
(If You would like your scientific glass web site mentioned on
this page just e-mail me at dglinde@aol.com)
The
British Society of Scientific Glassblowers listing www.glindemann.net as a
supplier
The American
Scientific Glassblowers Society listing www.glindemann.net as a supplier
Glassblowing Workshop of Colin F. M.
Smith
WHY
YOU SHOULD NOT USE SILICON GREASE ON YOUR GLASSWARE
The Glassware Gallery,
Glassware, Joints (by Rob Toreki)
Kimble-Kontes. Great sites
to gather additional information. Glindemann Seals
LabOnline
Australia. Feature Story - Sealing Your Ground Joints. Glindemann sealing rings.
Glassblowing workshop of Gary Coyne - one of the finest
how-to-use-joint-grease advices (3 types of joint greases versus Glindemann PTFE Sealing Rings)
(in
case this link is broken, download here Gary Coyne's joint-grease
advices)
G.M.
Associates, Inc,
one of the largest Manufacturers of
Quartz Glass Taper Joints
(Quartz Glass Conical Joints),
Scientific Glassblowing Societies
The American
Scientific Glassblowers Society
Scientific Glassblowers Association of Australia
British Society of Scientific Glassblowers
German Scientific Glassblowers
Scottish Glass Society
Other Glass Links
Scientific Glassblowing Basics
(East Carolina University)
Glassblowing Workshop of António
Morais, University of Aveiro, PORTUGAL
www.glassline.
www.glassonline.
www.glassartists.
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Disclaimer
The author assumes no responsibility or liability for action resulting
from use of this information.