Selecting a Rubber Compound

We have a vast portfolio of different polymers including many FKM rubber compounds. Contact us to ensure the right one is chosen for your application.

Compound Selector Tools

Polymer Comparison Table

Refine your ideal polymer, by reviewing all their attributes side-by-side

Open Selector Table
Polymer Selector
These values are purely indicative they can vary depending on the part manufactured and the operating environment.
Please contact us to be advised on the best solution to meet your requirements.
Scroll across to see all polymers...
No standard polymers match your criteria - please contact us
ASTM ClassificationDefine your requirementsFFKMFEPM CFEPM TFKM LTFKM 5FKM 4FKM 3FKM 2PFKM 2FKM 1FVMQPVMQVMQAEMHNBRACMEPDMNBR LNBR MNBR HPUCIIRBIIRIIRXNBRCSMECONBR/PVCCRSBR BR IRNR
Type / ClassKKHKHKHKHKFKM4HKHKHKHKFKFE/GEFC/FE/GEEE/EF/EGDHEH/DH/DFAA/BA/CA/DBFBG/CHBK/CHBGAA/BAAA/BAAA/BABF/BG/BKCECHBF/BG/BKBE/CEAA/BAAAAAAA
Upper service temp320 °C300 °C250 °C250 °C250 °C250 °C250 °C250 °C240 °C240 °C225 °C225 °C225 °C175 °C175 °C175 °C150 °C150 °C150 °C150 °C150 °C130 °C130 °C130 °C125 °C125 °C125 °C100 °C100 °C100 °C100 °C80 °C80 °C
Lower service temp-20 °C0 °C-9 °C-40 °C-10 °C-5 °C-25 °C-5 °C-10 °C-15 °C-60 °C-70 °C-60 °C-40 °C-25 °C-60 °C-55 °C-40 °C-30 °C-25 °C-50 °C-50 °C-50 °C-50 °C-15 °C-25 °C-35 °C-20 °C-40 °C-25 °C-60 °C-50 °C-40 °C
ASTM 1 OilExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentAverageAverageExcellentExcellentGoodNoneGoodExcellentExcellentExcellentNoneNoneNoneExcellentExcellentExcellentExcellentExcellentNoneNoneNoneNone
ASTM 2 OilExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentAverageAverageExcellentExcellentGoodNoneGoodExcellentExcellentGoodNoneNoneNoneExcellentGoodExcellentExcellentGoodNoneNoneNoneNone
ASTM 3 OilExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentAverageAverageExcellentExcellentGoodNoneGoodExcellentExcellentGoodNoneNoneNoneExcellentGoodExcellentExcellentGoodNoneNoneNoneNone
Liquid 101ExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentNoneNoneNoneExcellentNoneNoneGoodGoodExcellentGoodNoneNoneNoneExcellentNoneExcellentExcellentNoneNoneNoneNoneNone
Liquid 103ExcellentExcellentGoodGoodNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneGoodNoneNoneNoneNoneGoodGoodGoodNoneNoneNoneNoneNoneNoneNoneGoodGood
Fuel AExcellentGoodExcellentGoodExcellentExcellentExcellentExcellentExcellentExcellentExcellentNoneNoneNoneExcellentNoneNoneGoodGoodExcellentGoodNoneNoneNoneGoodNoneExcellentGoodAverageNoneNoneNoneNone
Fuel BExcellentGoodExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentAverageNoneNoneNoneGoodNoneNoneAverageGoodGoodAverageNoneNoneNoneAverageNoneNoneAverageNoneNoneNoneNoneNone
TolueneExcellentGoodExcellentGoodExcellentExcellentExcellentExcellentExcellentExcellentGoodNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNone
MethanolExcellentExcellentExcellentExcellentExcellentExcellentGoodExcellentGoodNoneExcellentExcellentExcellentNoneExcellentNoneExcellentGoodGoodExcellentNoneExcellentExcellentExcellentExcellentExcellentGoodExcellentExcellentExcellentExcellentExcellentExcellent
KeroseneExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentNoneNoneExcellentExcellentExcellentNoneGoodExcellentExcellentExcellentNoneNoneNoneExcellentGoodExcellentExcellentGoodNoneNoneNoneNone
KetoneExcellentNoneGoodAverageAverageNoneAverageGoodNoneNoneNoneNoneNoneNoneNoneNoneExcellentNoneNoneNoneNoneGoodGoodNoneNoneNoneNoneNoneAverageNoneNoneNoneNone
Acid (weak)ExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentGoodGoodAverageNoneNoneGoodGoodGoodGoodAverageAverageAverageNoneGoodGoodGoodAverageGoodAverageAverageGoodAverageAverageAverageAverage
Acid (strong)ExcellentExcellentGoodGoodGoodExcellentAverageGoodAverageAverageNoneNoneNoneNoneNoneNoneAverageNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNone
Base (weak)ExcellentExcellentExcellentExcellentExcellentNoneNoneNoneNoneNoneAverageAverageAverageNoneGoodNoneExcellentAverageAverageGoodNoneExcellentExcellentExcellentGoodGoodNoneGoodGoodGoodGoodGoodGood
Base (strong)ExcellentExcellentGoodGoodGoodNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneGoodNoneNoneNoneNoneGoodGoodGoodNoneNoneNoneNoneAverageNoneNoneNoneNone
Hydrogen SulphideExcellentExcellentExcellentGoodGoodNoneNoneAverageNoneNoneAverageAverageAverageNoneGoodNoneExcellentNoneNoneNoneNoneExcellentExcellentExcellentNoneNoneGoodNoneAverageNoneNoneNoneNone
SteamExcellentExcellentExcellentExcellentExcellentNoneAverageAverageNoneNoneNoneAverageAverageNoneAverageNoneExcellentNoneNoneNoneNoneGoodGoodGoodNoneAverageNoneNoneAverageNoneNoneNoneNone
OzoneExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentGoodExcellentExcellentAverageAverageAverageExcellentExcellentExcellentGoodAverageExcellentExcellentGoodGoodNoneNoneNoneNone
RadiationExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentAverageAverageAverageGoodGoodGoodExcellentAverageAverageAverageAverageGoodGoodGoodAverageGoodGoodGoodGoodAverageAverageAverageAverage
Hardness range (Shore A) 70- 9560 - 9560 - 9560 - 9560 - 9560 - 9560 - 9550 - 9550 - 9550 - 9525 - 8550 - 8520 - 8545 - 9050 - 9925 - 8525 - 9540 - 9540 - 9550 - 9525 - 8535 - 9035 - 9035 - 8550 - 9540 - 8040 - 9040 - 9535 - 9540 - 9540 - 9030 - 9530 - 95
Minimum non-brittle temp -30 °C0 °C-10 °C-45 °C-15 °C-10 °C-40 °C-30 °C-35 °C-20 °C-80 °C-80 °C-80 °C-60 °C-40 °C-60 °C-70 °C-55 °C-50 °C-45 °C-80 °C-70 °C-70 °C-70 °C-30 °C-40 °C-45 °C-30 °C-50 °C-50 °C-90 °C-70 °C-70 °C
Tensile strength 15 Mpa25 Mpa23 Mpa20 Mpa20 Mpa20 Mpa20 Mpa20 Mpa20 Mpa20 Mpa9 Mpa8 Mpa11 Mpa20 Mpa30 Mpa20 Mpa23 Mpa24 Mpa26 Mpa28 Mpa30 Mpa18 Mpa18 Mpa18 Mpa25 Mpa23 Mpa20 Mpa20 Mpa23 Mpa25 Mpa20 Mpa23 Mpa25 Mpa
Elongation at break 250%250%300%300%250%250%300%250%250%300%400%500%600%350%450%450%450%500%450%400%600%650%650%>700%250%350%400%400%450%500%550%600%600%
  FFKMViewFEPM CViewFEPM TViewFKM LTViewFKM 5ViewFKM 4ViewFKM 3ViewFKM 2PViewFKM 2ViewFKM 1ViewFVMQViewPVMQViewVMQViewAEMViewHNBRViewACMViewEPDMViewNBR LViewNBR MViewNBR HViewPUViewCIIRViewBIIRViewIIRViewXNBRViewCSMViewECOViewNBR/PVCViewCRViewSBR ViewBR ViewIRViewNR View

Polymer Types

Clwyd Compounders has an extensive library of different polymer grades and FKM rubber types which we process most of on a weekly basis.

We have the highly skilled workforce required to apply effective processing techniques for the different polymer grades we have to offer, including FKM rubber.

These polymers range from Natural rubber all the way through to synthetic polymers such as  FKM rubber, EPDM, Nitrile and Polychloroprene to name a few, we have the grade suitable for your desired performance criteria as well as being able to meet specifications to ensure the end part is optimal for your or your customer’s needs.

1
polymers processed in 12 months
1
formulations in our portfolio

Polymer Types

Do you know which polymer you are interested in, or just browsing? Find more information on each polymer below. If you cannot find your required polymer please contact us and we will be happy to help.

Find the perfect polymer for you…

Polymer Selector Table
Polymer Selector
These values are purely indicative they can vary depending on the part manufactured and the operating environment.
Please contact us to be advised on the best solution to meet your requirements.
Scroll across to see all polymers...
No standard polymers match your criteria - please contact us
ASTM ClassificationDefine your requirementsFFKMFEPM CFEPM TFKM LTFKM 5FKM 4FKM 3FKM 2PFKM 2FKM 1FVMQPVMQVMQAEMHNBRACMEPDMNBR LNBR MNBR HPUCIIRBIIRIIRXNBRCSMECONBR/PVCCRSBR BR IRNR
Type / ClassKKHKHKHKHKFKM4HKHKHKHKFKFE/GEFC/FE/GEEE/EF/EGDHEH/DH/DFAA/BA/CA/DBFBG/CHBK/CHBGAA/BAAA/BAAA/BABF/BG/BKCECHBF/BG/BKBE/CEAA/BAAAAAAA
Upper service temp320 °C300 °C250 °C250 °C250 °C250 °C250 °C250 °C240 °C240 °C225 °C225 °C225 °C175 °C175 °C175 °C150 °C150 °C150 °C150 °C150 °C130 °C130 °C130 °C125 °C125 °C125 °C100 °C100 °C100 °C100 °C80 °C80 °C
Lower service temp-20 °C0 °C-9 °C-40 °C-10 °C-5 °C-25 °C-5 °C-10 °C-15 °C-60 °C-70 °C-60 °C-40 °C-25 °C-60 °C-55 °C-40 °C-30 °C-25 °C-50 °C-50 °C-50 °C-50 °C-15 °C-25 °C-35 °C-20 °C-40 °C-25 °C-60 °C-50 °C-40 °C
ASTM 1 OilExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentAverageAverageExcellentExcellentGoodNoneGoodExcellentExcellentExcellentNoneNoneNoneExcellentExcellentExcellentExcellentExcellentNoneNoneNoneNone
ASTM 2 OilExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentAverageAverageExcellentExcellentGoodNoneGoodExcellentExcellentGoodNoneNoneNoneExcellentGoodExcellentExcellentGoodNoneNoneNoneNone
ASTM 3 OilExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentAverageAverageExcellentExcellentGoodNoneGoodExcellentExcellentGoodNoneNoneNoneExcellentGoodExcellentExcellentGoodNoneNoneNoneNone
Liquid 101ExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentNoneNoneNoneExcellentNoneNoneGoodGoodExcellentGoodNoneNoneNoneExcellentNoneExcellentExcellentNoneNoneNoneNoneNone
Liquid 103ExcellentExcellentGoodGoodNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneGoodNoneNoneNoneNoneGoodGoodGoodNoneNoneNoneNoneNoneNoneNoneGoodGood
Fuel AExcellentGoodExcellentGoodExcellentExcellentExcellentExcellentExcellentExcellentExcellentNoneNoneNoneExcellentNoneNoneGoodGoodExcellentGoodNoneNoneNoneGoodNoneExcellentGoodAverageNoneNoneNoneNone
Fuel BExcellentGoodExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentAverageNoneNoneNoneGoodNoneNoneAverageGoodGoodAverageNoneNoneNoneAverageNoneNoneAverageNoneNoneNoneNoneNone
TolueneExcellentGoodExcellentGoodExcellentExcellentExcellentExcellentExcellentExcellentGoodNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNone
MethanolExcellentExcellentExcellentExcellentExcellentExcellentGoodExcellentGoodNoneExcellentExcellentExcellentNoneExcellentNoneExcellentGoodGoodExcellentNoneExcellentExcellentExcellentExcellentExcellentGoodExcellentExcellentExcellentExcellentExcellentExcellent
KeroseneExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentNoneNoneExcellentExcellentExcellentNoneGoodExcellentExcellentExcellentNoneNoneNoneExcellentGoodExcellentExcellentGoodNoneNoneNoneNone
KetoneExcellentNoneGoodAverageAverageNoneAverageGoodNoneNoneNoneNoneNoneNoneNoneNoneExcellentNoneNoneNoneNoneGoodGoodNoneNoneNoneNoneNoneAverageNoneNoneNoneNone
Acid (weak)ExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentGoodGoodAverageNoneNoneGoodGoodGoodGoodAverageAverageAverageNoneGoodGoodGoodAverageGoodAverageAverageGoodAverageAverageAverageAverage
Acid (strong)ExcellentExcellentGoodGoodGoodExcellentAverageGoodAverageAverageNoneNoneNoneNoneNoneNoneAverageNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNone
Base (weak)ExcellentExcellentExcellentExcellentExcellentNoneNoneNoneNoneNoneAverageAverageAverageNoneGoodNoneExcellentAverageAverageGoodNoneExcellentExcellentExcellentGoodGoodNoneGoodGoodGoodGoodGoodGood
Base (strong)ExcellentExcellentGoodGoodGoodNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneNoneGoodNoneNoneNoneNoneGoodGoodGoodNoneNoneNoneNoneAverageNoneNoneNoneNone
Hydrogen SulphideExcellentExcellentExcellentGoodGoodNoneNoneAverageNoneNoneAverageAverageAverageNoneGoodNoneExcellentNoneNoneNoneNoneExcellentExcellentExcellentNoneNoneGoodNoneAverageNoneNoneNoneNone
SteamExcellentExcellentExcellentExcellentExcellentNoneAverageAverageNoneNoneNoneAverageAverageNoneAverageNoneExcellentNoneNoneNoneNoneGoodGoodGoodNoneAverageNoneNoneAverageNoneNoneNoneNone
OzoneExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentGoodExcellentExcellentAverageAverageAverageExcellentExcellentExcellentGoodAverageExcellentExcellentGoodGoodNoneNoneNoneNone
RadiationExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellentAverageAverageAverageGoodGoodGoodExcellentAverageAverageAverageAverageGoodGoodGoodAverageGoodGoodGoodGoodAverageAverageAverageAverage
Hardness range (Shore A) 70- 9560 - 9560 - 9560 - 9560 - 9560 - 9560 - 9550 - 9550 - 9550 - 9525 - 8550 - 8520 - 8545 - 9050 - 9925 - 8525 - 9540 - 9540 - 9550 - 9525 - 8535 - 9035 - 9035 - 8550 - 9540 - 8040 - 9040 - 9535 - 9540 - 9540 - 9030 - 9530 - 95
Minimum non-brittle temp -30 °C0 °C-10 °C-45 °C-15 °C-10 °C-40 °C-30 °C-35 °C-20 °C-80 °C-80 °C-80 °C-60 °C-40 °C-60 °C-70 °C-55 °C-50 °C-45 °C-80 °C-70 °C-70 °C-70 °C-30 °C-40 °C-45 °C-30 °C-50 °C-50 °C-90 °C-70 °C-70 °C
Tensile strength 15 Mpa25 Mpa23 Mpa20 Mpa20 Mpa20 Mpa20 Mpa20 Mpa20 Mpa20 Mpa9 Mpa8 Mpa11 Mpa20 Mpa30 Mpa20 Mpa23 Mpa24 Mpa26 Mpa28 Mpa30 Mpa18 Mpa18 Mpa18 Mpa25 Mpa23 Mpa20 Mpa20 Mpa23 Mpa25 Mpa20 Mpa23 Mpa25 Mpa
Elongation at break 250%250%300%300%250%250%300%250%250%300%400%500%600%350%450%450%450%500%450%400%600%650%650%>700%250%350%400%400%450%500%550%600%600%
  FFKMViewFEPM CViewFEPM TViewFKM LTViewFKM 5ViewFKM 4ViewFKM 3ViewFKM 2PViewFKM 2ViewFKM 1ViewFVMQViewPVMQViewVMQViewAEMViewHNBRViewACMViewEPDMViewNBR LViewNBR MViewNBR HViewPUViewCIIRViewBIIRViewIIRViewXNBRViewCSMViewECOViewNBR/PVCViewCRViewSBR ViewBR ViewIRViewNR View

Specialist Rubber Compounds

We have dedicated mixing facilities along with an exclusive workforce to compound speciality polymers such as FKM rubber (including Viton™), FFKM and a wide range of different Silicone grades.

These compounds are at the forefront of our business and our technical staff have an extensive range of knowledge on the grades we have available and how to effectively formulate with them to achieve the desired results you require from the compound. Due to the increase in cost of such speciality materials we understand how important it is to meet your requirements first time and working alongside us, we can achieve that together.

Specialist rubber compounds for a variety of industries

Clwyd Compounders supply materials for use in a wide range of industries, information about widely used polymers in a selection of our main markets is given below:

The ultimate FFKM elastomer for applications where only outstanding performance is good enough; suitable for use over a temperature range of -40 to 320°C.

Applications include:

  • Seals for cabinets used in the manufacture of semiconductors, where plasma resistance is essential
  • Reaction column seals for the chemical industry
  • Deep well drilling applications, requiring prolonged performance at temperatures > 250°C and resistance to high pressure steam and amines
  • Food industry applications where there is a requirement for high performance whilst undergoing high pressure steam cleaning

Clwyd Compounders have extensive experience of compounding these materials, and will take into account the full range of factors which may affect compound performance under these extreme conditions, so that you can order these very expensive materials with confidence.

All perfluoroelastomers compounds are produced in a dedicated clean room facility, and vacuum packed into foil bags for dispatch to avoid contamination.

Clwyd Compounders have been at the forefront of fluoroelastomer compounding for over 30 years. We have a dedicated internal mixer and mixing line for fluoroelastomer compounds / FKM rubber which benefits from our decades of experience, improving the process, to provide the most consistent compound on the market.

Fluoroelastomers / FKM rubber are often considered to be a single polymer type, but fluoroelastomers can be further subdivided on the basis of their monomer type(s). Different fluoroelastomer subtypes offer different compound properties (dependent on their constituent monomers and cure systems), which can lead to significant differences in compound performance. This large family of elastomers include polymers that are capable of resisting oils, methanol, caustic or corrosive chemicals, steam and extremes of temperatures (as low as -50°C or as high as 320°C). As fluoroelastomer specialists, we can help guide you to the most suitable fluoroelastomer subtype for your needs.

Fluoropolymer Selector Table
Fluoropolymer Selector
These values are purely indicative they can vary depending on the part manufactured and the operating environment.
Please contact us to be advised on the best solution to meet your requirements.
Scroll across to see all polymers...
No standard polymers match your criteria - please contact us
ASTM ClassificationDefine your requirementsFFKMFKM 2PFKM 3FKM 5FKM LTFEPM TFKM 1FKM 2
Type / ClassKKHKHKHKHKHKHKHK
Upper service temp320 °C250 °C250 °C250 °C250 °C250 °C240 °C240 °C
Lower service temp-20 °C-5 °C-25 °C-10 °C-40 °C-9 °C-15 °C-10 °C
ASTM 1 OilExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellent
ASTM 2 OilExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellent
ASTM 3 OilExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellent
Liquid 101ExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellent
Liquid 103ExcellentNoneNoneNoneGoodGoodNoneNone
Fuel AExcellentExcellentExcellentExcellentGoodExcellentExcellentExcellent
Fuel BExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellent
TolueneExcellentExcellentExcellentExcellentGoodExcellentExcellentExcellent
MethanolExcellentExcellentGoodExcellentExcellentExcellentNoneGood
KeroseneExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellent
KetoneExcellentGoodAverageAverageAverageGoodNoneNone
Acid (weak)ExcellentExcellentExcellentExcellentExcellentExcellentGoodGood
Acid (strong)ExcellentGoodAverageGoodGoodGoodAverageAverage
Base (weak)ExcellentNoneNoneExcellentExcellentExcellentNoneNone
Base (strong)ExcellentNoneNoneGoodGoodGoodNoneNone
Hydrogen SulphideExcellentAverageNoneGoodGoodExcellentNoneNone
SteamExcellentAverageAverageExcellentExcellentExcellentNoneNone
OzoneExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellent
RadiationExcellentExcellentExcellentExcellentExcellentExcellentExcellentExcellent
Hardness range (Shore A) 70- 9550 - 9560 - 9560 - 9560 - 9560 - 9550 - 9550 - 95
Minimum non-brittle temp -30 °C-30 °C-40 °C-15 °C-45 °C-10 °C-20 °C-35 °C
Tensile strength 15 Mpa20 Mpa20 Mpa20 Mpa20 Mpa23 Mpa20 Mpa20 Mpa
Elongation at break 250%250%300%250%300%300%300%250%
  FFKMViewFKM 2PViewFKM 3ViewFKM 5ViewFKM LTViewFEPM TViewFKM 1ViewFKM 2View
We can supply silicone (VMQ), fluorosilicone (FVMQ) and phenyl silicone (PVMQ) compounds suitable for applications ranging from medical to aerospace.

We also offer a range of specialised silicone and fluorosilicone compounds which contain specialist materials or additives. This range of compounds offers additional special properties, and includes:

  • Conductive Silicone Compounds (loaded with graphite, carbon nanotubes or other specialist composite materials)
  • Antimicrobial and antifungal silicone compounds
  • Metal-loaded silicone compounds
  • Magnetic silicone compounds