Fluorezi®  FFKM  | O-rings and seals

The world’s most chemical resistant rubber type for O-rings and seals
with high temperature resistance up to 325 ºC

What is Fluorezi® FFKM

Fluorezi® is our FFKM rubber. FFKM or perfluoroelastomers are elastomers that contain higher amounts of fluorine than any other fluorinated elastomer like standard FKM. This unique feature makes FFKM have a near-universal chemical compatibility. O-rings and seals made of FFKM rubber have the highest chemical and heat resistance of all elastomers up to 325 ºC.

When to use Fluorezi® | FFKM

The material price of FFKM is very high in comparison to any other elastomer. Fluorezi® is at it’s best when:

> The costs of seal failure are high
> Downtime costs are high
> Overhaul time needs to be reduced
> Sealing failure results in: environmental emissions or spills, the safety risk of people, or the contamination of products.  


Why use Fluorezi® | The benefits

> Best price guarantee

> High & consistent quality

> Any size & quantity

Production time: 4 weeks

Fluorezi® FFKM material types

40 green

40 series | General purpose

Equivalent to Kalrez® 6375, Isolast® J9440, Simriz® 495, Simriz® 485, Parofluor® V8787-75

FFKM 41 series on hover

41 series | High temperature

Equivalent to Kalrez® 4079 & Kalrez® 1050LF, Isolast® J8325, Parafluor® V8545-75, Perlast® G75TX

FFKM 42 series on hover

42 series | Ultra high temperature

Equivalent to Kalrez® 7075

FFKM 45 series on hover

45 series | Low temperature

Equivalent to Chemraz® 505

FFKM 48 series on hover

48 series | Explosive decompression resistant

Equivalent to Kalrez® 0090

Generic FFKM material information

Performs well in

  • Concentrated alkalis and basis
  • Ketones, esters and ethers
  • Halogens and strong oxidizing media
  • Hydraulic and fuel oils and fuels
  • Organic solvents
  • Hot water and steam
  • CIP and SIP cleaning media Aliphatic and aromatic amines
  • Ethylene oxide and propylene oxide

Does not perform well in

  • Fluorinated refrigerating agents
  • Perfluorolubricants

Typical FFKM Applications

  • Chemical processing
  • Semiconductor and nanotechnology
  • Lacquer, print and coatings
  • The aerospace and aviation industries
  • Marine fuel systems

FFKM Product range

FFKM o-rings


O-rings provide engineers with a high-performance sealing element in a wide range of static and dynamic applications. NewDealSeals offers O-rings according to standards for example:

> AS 568A American standard
> ISO 3601 International standard

NewDealSeals also offers moulded O-rings in non-standard sizes according to customer specifications. Read more about O-ring sizes and dimensioning in our O-ring Handbook:


Specific parts are designed, developed and produced in conjunction with customers to ensure that all requirements
are satisfied. NewDealSeals offers custom-moulded parts in virtually any shape.

The physical characteristics of  perfluoroelastomers require careful design input from engineers at NewDealSeals. NewDealSeals perfluoroelastomer custom-moulded parts are a typical area of proven success in even the most hostile of environments.

Fluorezi® types overview| FFKM materials

Key features Temperature range Price level
40 Series General purpose
Good chemical resistance
Mimimum -10 °C(Continious)/-15 °C(short)
Maximum +240 °C(Continious) /+250 °C(short)
41 Series High thermal resistance Mimimum -10 °C(Continious)/-15 °C(short)
Maximum +320 °C(Continious)/+330 °C(short)
42 Series Very high thermal resistance Mimimum -10 °C(Continious)/-15 °C(short)
Maximum +330 °C(Continious)/+340 °C(short)
43 Series Best chemical resistance Mimimum -10 °C(Continious)/-15 °C(short)
Maximum +240 °C(Continious)/+250 °C(short)
45 Series Great low temperature resistance Mimimum -40 °C(Continious)/-45 °C(short)
Maximum +240 °C(Continious)/+250 °C(short)
48 Series Explosive decompression resistant Mimimum -10 °C(Continious)/-15 °C(short)
Maximum +240 °C(Continious)/+250 °C(short)

FFKM material interchange table

 Kalrez ® Isolast® Simriz® Chemraz® Parafluor® Perlast®
40 Series 6375 J9440 495
V8787-75 G70A/G75M
41 Series 4079
J8325 V8545-75 G75TX
42 Series 7075
43 Series J9503
45 Series 505-
48 Series 0090

Certifications & compliances

Newdealseals offers a wide range of products & materials that are certified and/or in compliance with industry specific standards. Examples of certifications and compliances:

FDA CFR 21.177.2600 (A-D) Dry foods
FDA CFR 21.177.2600 (A-F) Fatty foods
EC 1935/2004 compliance
EC 2023/2006 compliance
BFR Class XV

USP class VI
ISO 10993
NSF 61 section 6

Oil & Gas
Norsok M710

Drinking water


Gas appliances
DIN EN 549

Alternatives for FFKM, Fluorezi® O-Rings & Seals

Do you want improved low temperature properties?

Are you looking for a more economical alternative?

VMQ, Silicone O-Rings

Temperature range (-54 to 232 °C). Very suitable for mineral oils. Good flexibility, low compression set, ozone and UV-resistant.

VMQ, Silicone ►

FKM, Viton® O-Rings

Temperature range (-25 to 204 °C). Very good resistance to chemicals, oils, ozone and UV. Suitable for static and light dynamic applications.

FKM, Viton®►

Contact Us

We believe in the quality of our products and service. Fill out the form and one of our skilled engineers will contact you within the next business day.

Contact details

+31 (0) 226 362 233
Energiestraat 2-5, 1749 DN Warmenhuizen, Nederland

7 + 12 =