Margo Rubber Products
Moulded rubber compression pump inlays
SHORE A
±5 pts against the specified hardness
TENSILE
Per compound datasheet, ASTM D412

Oil Seals

Compression Pump Inlays — Moulded Elastomer Inserts

Moulded elastomer inlays for compression pumps, made to your drawing or sample. Silicone to +220 °C for clean, high-temperature duty; FKM where the medium is aggressive; NBR where it is oil — one part, three compounds, chosen on what the pump handles.

HARDNESS
40–90 Shore A, to your drawing
TEMPERATURE
−60 to +220 °C in silicone; −20 to +250 °C in FKM; −30 to +120 °C in NBR
MEDIUM
State what the pump handles
DUTY
Static or cyclic, and the cycle rate if cyclic
QTY (pieces)
−10,000+
Minimum run: 10,000 pieces per part number
Request QuoteRequest documentation
  • MADE TO ORDER
  • ISO 9001:2015
  • 09111526A

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Visual Reference

360° PREVIEW

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Cross section viewSection through the inlay and its housing — on request under NDA

Thickness
Free thickness
Housing bore
The pump bore the inlay seats in
Working compression
Percentage of free thickness
Medium and temperature
What the pump handles, and how hot

Section drawing available on request. Send the housing bore, the free thickness and what the pump handles — or the worn inlay with a note of the medium and temperature — and we will return a dimensioned drawing for approval.

Technical specifications

Engineering Data

Product Family
Oil Seals
Material
Silicone, FKM or NBR — selected on the medium
Hardness (Shore A)
40–90 Shore A, to your drawing
Tensile Strength
Per compound datasheet, ASTM D412
Elongation at Break
Per compound datasheet, ASTM D412
Operating Temperature
−60/+220 °C silicone · −20/+250 °C FKM · −30/+120 °C NBR
Compression Set
Tested to ASTM D395 Method B
Density
Per compound datasheet
Colour Options
Black standard. Silicone is commonly supplied in a light colour so contamination is visible
Lead Time
Confirmed with the quotation, from approved drawing and approved sample
Medium compatibility
Stated per compound
Working compression
Percentage of free thickness, to your drawing
Duty
Static or cyclic; cycle rate if cyclic
Certifications
ISO 9001:2015 — certificate 09111526A, valid to 21 February 2027
Minimum Order
10,000 pieces per part number, per compound, or quoted against the part where geometry or tooling makes that unrealistic. Prototype and first-article lots sit outside the minimum.

Dimensional reference

To customer drawing
Thickness
Free thickness
Housing bore
The pump bore the inlay seats in
Working compression
Percentage of free thickness
Medium and temperature
What the pump handles, and how hot

Available materials

Rubber Compound Options

Select the compound best suited to your operating environment and application requirements.

Compound

NBR

Nitrile Butadiene Rubber

Temperature range

−30 to +120 °C

For this part

Where the pump genuinely handles oil, and the cheapest of the three.

Not sure? Send the medium, temperature and load

Moulded rubber compression pump inlays

SERVICE RANGE

−60 to +220°C

silicone

Key advantages

Why Specifiers Choose Margo

  • The medium picks the compound

    Tell us what the pump handles and how hot it runs. Silicone for clean high-temperature duty, FKM for aggressive chemistry, NBR for oil — and we will say when the cheaper one is enough.

  • Silicone is not an oil compound

    It has the widest temperature range of the three and the weakest abrasion resistance, and it swells in hot mineral oil. If your pump handles oil, specify NBR or FKM — saying so is cheaper than a failed inlay.

  • Compression set decides service life

    An inlay that takes a permanent set stops sealing while it still looks correct. We test compression set in-house to ASTM D395 Method B and report it with every consignment.

  • Food or pharmaceutical duty needs a named approval

    Silicone is physiologically inert, but that is a material property, not a certificate. Tell us which scheme your market requires and we will confirm what we can supply against it.

Industries served

Global Applications

Manufacturing process

From Compound to Certification

  1. Material compounding

    Polymer blending, additive integration and batch QC in our in-house lab. The silicone grade is set here against the medium and the temperature, before any dimension matters.

  2. Mould design and CNC tool manufacture, in-house, held as a controlled record. Tooling is compound-specific

    Silicone and FKM shrink differently, so one part in three compounds is not one tool.

  3. Compression Moulding

    Hydraulic press cycles at controlled temperature and pressure profiles per product spec.

  4. Post-cure and trimming

    Silicone parts are oven post-cured to drive off residual volatiles, which is what gives the compound its full temperature performance and low odour.

  5. Quality inspection

    Dimensional check, hardness, and compression set on batch samples to ASTM D395 Method B.

  6. Export packaging

    Industrial packing with documentation. ISPM-15 treated pallets where timber packaging is used. Inlays are packed uncompressed, since an insert stored under load arrives already set.

Quality assurance

Certified to International Standards

Every product leaves our facility with a documentation package — material test reports, dimensional inspection sheets and a certificate of conformance — giving traceability from raw material to finished part.

  • ISO 9001:2015 · Certificate 09111526A

    Integral Certification Ltd · Valid to 21 February 2027

    Scope: rubber moulded components — quality management, not a product approval

  • IATF 16949 — upgrade in progress, certification targeted by end 2026

  • ISO 14001 and ISO 45001 — targeted 2027

We do not hold food-contact or pharmaceutical approvals. Tell us which scheme your market requires and we will confirm what we can supply.

Certification detail

Production metrics

Since 2005
In operation
60+
Active clients
3–4 weeks from approved sample
Avg. lead time

Downloads

Technical Documentation

Compound datasheets and dimensioned drawings are issued on request, under NDA where required. Tell us what the pump handles and how hot it runs, and we will send the compatibility data for the compounds that suit it.

Request compatibility data

FAQ

Technical & Commercial Questions

Answers to the most common questions from engineering teams and procurement managers worldwide.

  • What is the minimum order quantity for this part?

    We supply in bulk. The minimum run is 10,000 pieces per part number, per compound — and because silicone, FKM and NBR shrink differently, each compound needs its own tool. Prototype and first-article lots sit outside the minimum.

  • Can you match a competitor specification or reverse-engineer an existing part?

    Yes. Send the worn inlay and tell us what the pump handles and how hot it runs — a used insert has taken a compression set and measures thinner than moulded, so we work to the housing and the free thickness, not to the sample.

  • What file formats do you accept for drawings?

    PDF, DWG, DXF and STEP. Mark the housing bore, the free thickness and the working compression — and state the medium and temperature, which decide the compound before any dimension matters.

  • Do you provide material test reports with each shipment?

    Yes. Material test reports, dimensional inspection sheets and a certificate of conformance ship with every consignment. Hardness, tensile to ASTM D412 and compression set to ASTM D395 Method B are tested in-house. We do not hold food-contact or pharmaceutical approvals — tell us which scheme you need and we will confirm what we can supply.

  • What are your payment and delivery terms for international orders?

    TT and LC accepted, discussed per order. Ex-works Nashik or FOB Nhava Sheva. Commercial invoice, packing list and certificate of origin are issued with every consignment.

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Same compound

Other parts we mould in the same compounds

Guides

Further Reading

  • FKM vs NBR: Which Rubber Is Right for Your Application?

    Compares fluorocarbon and nitrile across temperature, chemical resistance and cost-in-use — FKM −20 to +250 °C, NBR −30 to +120 °C. FKM is the answer where temperature or aggressive media demand it; NBR is the answer everywhere else, and it costs a fraction as much.

Need this part quoted?

Send your drawing or a sample, and tell us what the pump handles and how hot it runs. We confirm compound, hardness and working compression — and say when a cheaper compound will do — then quote against your annual quantity. We respond within 48 hours.

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