We Specialise in Custom Rubber Compounds

Providing unparalleled quality and technical advice since 1979.
Clwyd Compounders have over 40 years experience supplying quality compounds to a wide range of industries.

We understand rubber in-depth – from formulation to application – and supply the highest quality rubber compounds to meet the most demanding of end-user specifications in industries ranging from oil & gas to food processing. We also understand the needs of downstream processors, working closely with our customers to ensure the compounds we supply process efficiently thus minimising waste.

Do you need help selecting your rubber compound?
We have a selector tool to help you.

Alternatively, you can reach our Technical Experts today.

Learn more about our history and expertise.

OFFERING A FULL COMPOUNDING SERVICE
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

We deliver quality and consistency through our technical expertise
to meet rigorous customer requirements
and new industry standards.

Technical Expertise

Testing to Specifications

Committed to Quality

Comprehensive Selection

Latest News

UK REACH Registration Deadlines Officially Extended

UK REACH Registration Deadlines Officially Extended The long-awaited decision by the UK government on whether to extend the UK REACH registration deadlines for those wanting to sell chemicals into the UK has finally been taken. It had been expected for…

Clwyd Compounders’ response to the proposed PFAS ban

Clwyd Compounders’ response to the proposed PFAS ban Clwyd Compounders are the UK’s leading FKM and FFKM compounder and have now put forward their points of view on the proposed ban on PFAS.Whilst we fully support the ban of short…