Markez Z40 FFKM O-Ring UK Suppliers

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Reviewed by MLC Editorial Team | 26 July 2026

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Markez Z40 is a 75 Shore A perfluoroelastomer (FFKM) manufactured by Marco Rubber. It seals continuously to 316°C and is specified for steam service and similar service. Steam/amine-resistant FFKM.

Specifications

Property	Value
Compound	Z40
Manufacturer	Marco Rubber
Maximum continuous temperature	316°C
Minimum temperature	0°C
Hardness	75 Shore A
Colour	Black
Material family	Steam/amine-resistant FFKM

Where Markez Z40 is used

Markez Z40 is specified for: Steam service, hot amines.

Markez Z40 equivalents from other FFKM manufacturers

If Markez Z40 isn't available, these compounds from competing manufacturers have similar chemistry and operating windows. Always verify against your actual fluid and temperature before substitution.

Equivalent compound	Manufacturer	Max temp	Hardness	Direct match
Kalrez 4079	DuPont (Chemours)	316°C	75 Shore A	✓

Available O-ring sizes

Markez Z40 is supplied in:

BS 1806 sizes: BS001 to BS932 (UK / EU standard, imperial-origin metric)
AS568 sizes: -001 to -932 (US standard, dimensionally identical to BS 1806)
ISO 3601 sizes: metric IDs from 2 mm to 670 mm with cross-sections 1.0 mm to 7.0 mm
JIS B 2401: P, G, S series (Japanese OEM equipment)
Custom / non-standard: built-to-print for OEM applications

For a list of sizes commonly stocked in the UK, see the BS 1806 size chart, ISO 3601 metric chart, or contact a UK seal specialist below.

UK availability

Markez Z40 is supplied in the UK by FFKM specialists carrying multiple manufacturer lines. Lead time is typically 2-5 working days for stock sizes, 4-8 weeks for custom-moulded sizes. Use the form below to get a quote from a UK FFKM specialist.

Get a quote for Markez Z40 FFKM O-Ring UK Suppliers

Acumen Seals & Pumps - UK specialist in mechanical seals, FFKM O-rings, Kalrez compounds, and elastomer parts. 36 years of inventory, UK stock with 24-48 hour despatch, and a price back within 4 working hours.

Send an enquiry via the MLC contact form

References

Marco Rubber - Manufacturer
ISO 3601 O-ring sizes
BS 1806

Frequently Asked Questions

What is Markez Z40 used for?

Markez Z40 is a 75 Shore A FFKM (perfluoroelastomer) compound from Marco Rubber. It is used in Steam service, hot amines. Continuous service temperature: 0°C to 316°C.

What is the temperature rating of Markez Z40?

Markez Z40 has a continuous service temperature range of 0°C to 316°C. Short-term excursions above the maximum are possible but degrade service life.

What is the equivalent of Markez Z40?

Direct equivalents to Markez Z40 include: Kalrez 4079. Always confirm chemical compatibility against your specific fluid before substitution.

How much does Markez Z40 cost?

FFKM O-rings such as Markez Z40 are typically £30 to £500 per piece depending on size, with custom or large-bore parts at the upper end. Get a current quote via the form on this page.

Where can I buy Markez Z40 in the UK?

Markez Z40 is supplied in the UK by independent FFKM seal specialists with multi-brand inventory. Lead time is 2-5 working days for stock BS/AS568 sizes, 4-8 weeks for custom-moulded sizes.

Independent UK engineering trade publication. Company profiles cross-referenced with Companies House.

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Get a UK price for Markez Z40 FFKM O-Ring UK Suppliers

Andrew Sykes at Acumen Seals & Pumps — 36 years in sealing. UK stock with 24–48 hour despatch, and a price back within 4 working hours. OEM and production-run enquiries welcome, from a single seal to scheduled supply of thousands of parts.

Your enquiry goes straight to Acumen Seals & Pumps in the UK. No obligation, and we never pass your details to anyone else.