- Offer Profile
- As an independent
manufacturer we belong to one of the leading supplier of precision O-rings
and Elastomer seals.
COG delivers from Europe’s largest O-ring stock most various materials,
including FKM an FFKM.
Besides, our developers are always happy to meet any specific requirements
of your industry.
The ring is important.
COG is absolut uncompromising with the quality of their
products. Because this is the reason why our clients are among
the best in their respective industries. COG delivers Europe's
largest O-Ring stock (over 45,000 items in stock) most
differerent compounds, incl. FFKM/FFPM. Come and test over 140
years of experience and innovation!
Our product range includes:
- Over 45,000 items in stock
In-house mixing, mixture development and production
also small-scale production
O-Rings, produced according to ISO 3601 and elastomer sealings: All
current materials: AU, CR, EPDM, EPM, FEPM, FFKM, FPM,
FYMQ, HNBR, IIR, NBR, NR, PTFE, PVMQ, VMQ. Here you will find more
information about sealing materials
Inside diameter from 0.74 to 1400 mm; Strength of thread from 0.6 to
With the production technique Endless Vulcanisation: all inner
diameters between 1400 mm and 3000 mm possible for FPM, NBR and HNBR
compounds with a cord diameter from 5 to 14 mm and for EPM compounds
with a cord diameter from 5 to 15 mm.
Shape: In small ranges: sealing collars, flat rings, square rings
can be produced from a model or sketch from the above mentioned
- Aflas® (FEPM)
Acrylonitrile-buta-diene natural rubber (NBR)
Butyl natural rubber (MR)
Chloroprene-natural rubber (CR)
Ethylene propylene diene natural rubber (EPDM)
Perfluor-natural rubber (FFPM)
Fluoro natural rubber (FPM)
Fluorosilicone natural rubber (FVMQ)
Hydrogenated nitrile natural rubber (HNBR)
Natural rubber (NR)
Polyurethane natural rubber (AU)
Silicone rubber (VMQ)
Viton® Extreme-ETP (FEPM)
COG has a huge selection always in stock. In addition, we´ll
manufacture lots of things you won´t get elsewhere, on request
specially for you. In the shortest possible time. At the fairest of
prices. As a one-off order or as a batch.
Customized production of O-Rings
You can't find what you're looking for in our vast range? No problem
- COG customised production will be pleased to help with your
special requirements. Even the most "unconventional" seals can be
individually manufactured at our own production facilities (in-house
compounding, in-house development, in-house toolmaking). In the
materials and qualities of your choice - within a matter of days.
Singly and in large or small batches. It's an offer that few other
manufacturers can match. And another thing that you'll be pleased to
hear: customised production at COG costs less than you think. Let’s
talk about your aims!
O-Rings must be stored in the proper manner to ensure that they will
seal properly when fitted. Storage, cleaning and maintenance should
therefore by carried out in accordance with the DIN 7716 guidelines.
O-Rings should always be stored where they are protected from
external damage such as surface damage due to staples or distortion
from heavy weights laid on top of them. O-Rings must also be stored
in a dry place and if possible at room temperature.
O-Rings should be stored in sealed polythene bags where possible,
should not be exposed to daylight for long periods and should be
kept away from sources of ozone.
These precautions will considerably reduce any change in the
properties of the O-Ring due to premature ageing, hardening or
weathering and will increase their service life without
significantly restricting their use.
Perlast® – a class for itself.
For some applications there is no alternative to a perfluorelastomer. In thoses
cases it is good to know if you can trust in the extraordinary Perlast® compound
from COG. As a state-of-the-art product Perlast® combines PTFE resistance to
chemicals and heat with FPM elastomer properties. It is used where other
elastomers can not do the job and maximum reliability is required. Special
Perlast® materials compliant with FDA, USP Class VI and clean room requirements
are used in e.g. in the pharmaceutical and food industries.
The Perlast® range of elastomers offer performance characteristics that span the
most demanding of applications in industries. Perlast®'s flexibility provides
you with a number of advantages. The combination of in-house tooling, extensive
range of material grades and rapid production, means that non-standard O-Rings
and custom components can be supplied just as easily as a BS/AS standard sizes –
with exceptionally short lead times.
Advantages of Perlast®:
Maximum chemical restistance of all elastic sealing materials
High temperature stability up to 325 °C, depending to the used type
Low compression set
Excellent vacuum performance
Flexibel in the application
Appropiate material for various requirements
Wide range of approvals/ licences
Ring diameter up to 2000 mm possible
Perlast® G75B: „The Top All Rounder“
Perlast® G75B has been specially formulated to provide increased
acid resistance by eliminating fillers that are prone to acid attack
and optimising the polymer structure. In addition, this
perfluoroelastomer has low permeability and as a result, it is less
prone to swelling, leading to extended in-service performance in,
for example, valves, pumps and mechanical seals.
A high modulus makes G75B resistant to extrusion and ideal for use
in high pressure environments. In addition, the low long-term
compression set provides a high mean-time between maintenance cycles
in hot chemically aggressive environments. Perlast® G75B is suitable
for both dynamic and static applications and can be moulded into
O-Rings and custom shapes. Also suitable for vacuum applications.
Temperature stability up to 325 °C. Available in the hardness of 78
°IRHD / Shore A 79.
Perlast® G75H incorporates a novel reinforcement system which
produces a synthetically clean compound formulated for minimum
particle generation combined with excellent resistance to aggressive
oxygen and fluorine based plasmas. Extensive chemical and steam
resistance. Particularly suitable for applications in the
semiconductor industry and also an optimal choice for dynamic
applications. Because of its extremely low outgassing properties
PERLAST® G75H is used in the vacuum technolgy. Specially developed
for Plasma and Gas Deposition applications including ashing,
etching, HDPCVD, PECVD, SACVD.
Particularly suited for use in applications which require exposure
to temperatures of up to 320°C (continuous use temperature approx.
260 °C ) combined with excellent mechanical properties. Available in
the hardnesses of 75 °IRHD.
Perlast® G74P, G67P
An ultra-pure grade of translucent perfluoroelastomer. This
translucent beige compound with semi-crystalline perfluoropolymer
nano-filler, specially developed to meet the demands of the
semiconductor and bio-analytical industries. Compatible with
fluorine based chemistries and universally suitable for both wet and
dry semiconductor processes including Lithography, Plasma, PVD, CVD,
Etch, Stripping and Cleaning.
Perlast® G74P combines a fully fluorinated polymer backbone, a fully
fluorinated nano-filler system (no inorganic fillers) and a highly
fluorinated cross-linking process, which results in a
perfluoroelastomer with unrivalled purity, chemical resistance and
Perlast® G74P exhibits extremely low out-gassing properties, making
it ideal for use in vacuum applications. Because of the very small
filler material particles it is also suitable at very shortwave
laser light. Available in the hardnesses of 64 and 75 °IRHD / Shore
A 64 and 74.
Perlast® G75S, G74S
Pure white multi-purpose perfluoroelastomer compound for Life
Perlast® G75S is an all round material that can be used for all
types of applications requiring FDA and USP Class VI compliance. It
is suitable for use in all product contact applications including
dry, aqueous and fatty media.
Unlike other FDA compliant elastomers, Perlast® G75S is thermally
stable at higher temperatures, and is ideal for use in applications
which require exposure to temperatures up to 310°C (590°F) making it
suitable for use in Stage II Sterilization processes.
Perlast® G75S is suitable for both dynamic and static applications
and can be moulded into O-Rings and custom shapes.
Perlast® G75S has been specifically developed to cope with a wide
range of process media, potent active pharmaceutical ingredients
(API's) and aggressive cleaning agents, being especially suited to
withstand steam-in-place (SIP) and clean-in-place (CIP) procedures
within pipe work and vessels. G75S is also suitable for other
critical applications such as Water-For-Injection (WFI) systems.
Available in the hardnesses of 72 and 80 °IRHD.
Perlast® G80A, G60A, G70A, G90A
This black general purpose perfluoroelastomer compound with
excellent chemical resistance is a very popular all rounder
material. It is particularly suitable for various industries
applications with an optimal cost-ratio performance for the users.
Exceptionally high chemical resistance and excellent steam
resistance and mechanical properties. Extremely low outgassing
properties. Available in the hardnesses of 60, 70, 80 and 90 °IRHD
When speed is important!
If really necessary and when postponement is not possible, COG offers its
customers express production. This special service is to help users out of an
awkward situation. This means that high-quality precision O-Rings which are not
in stock can be manufactured in between 5 and 7 working days*. These orders are
put in the “fast lane” in the sophisticated production process and are delivered
in the shortest possible time.
A total of 8 different frequently used materials are stocked continuously at COG
specifically for the express service. These include FPM/FKM, FEPM, VMQ, HNBR,
NBR and EPDM compounds. On request other mixtures can also be produced using the
express production process provided these mixtures are in stock. You will need
to contact our sales department here first.
Key data for express production:
Production time of between 5 and 7 work days*
- 8 different material mixtures in continuous stock
- Maximum quantity depends on the size of the O-Rings
- Express surcharge: flat rate of 250 EUR plus VAT.