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Carbon Graphite Bearings for Pump Service

Screen a starting material family. Confirm the exact grade, chemistry, PV, and clearance with the bearing supplier.

For pump OEMs, maintenance engineers, and procurement teams evaluating a custom bearing.

Content publisher: Custom Graphite Parts · Source review: October 2, 2026

Request a grade-specific reviewReview limits and source data
Pump Duty Quick Screen
Initial shortlist only — not a bearing-grade approval.

Bands are for screening only; use actual temperatures for grade review.

RPM alone is not surface speed or PV; shaft diameter and load are needed for those checks.

Carbon graphite bearings and bushings for high-performance pump service

Design Checks, Evidence & Limits

Use the cited grade data as examples, then verify the exact bearing grade against the actual pump duty.

Hot Water & Condensate
Do not treat "boiler feed" as a grade by itself. Mersen lists reduced porosity and improved mechanical strength as benefits of its antimony impregnation; the manufacturer-specific data does not establish it as a universal pump-water standard. Confirm pressure, temperature, fluid condition, start-stop duty, and shaft counterface with the bearing supplier.
Chemical Compatibility Boundaries
Compatibility depends on chemical identity, concentration, temperature, and the exact graphite/impregnant grade. Mersen's chart includes temperature-dependent ratings and no-data cases. Do not infer that PTFE is required—or compatible—from a broad label such as "acid" or "alkali"; verify the exact service against a current supplier chart.
Example grade temperature maxima
Values below are from specific Mersen grades, not universal limits for every carbon graphite bearing.
Example maximum operating temperatures listed in the Mersen mechanical applications brochure
Listed Mersen impregnationMaximum temperature
Phenolic resin200°C
PTFE250°C
Antimony450°C

These are manufacturer-published maxima for listed grades (Mersen mechanical-applications brochure, accessed October 2, 2026). They do not confirm chemical compatibility, bearing capacity, oxidation behavior in every atmosphere, or suitability for a specific pump. Verify the current grade datasheet and operating conditions.

Data needed for PV and clearance review
A defensible limit requires the actual grade and duty point. This page does not publish a generic PV rating or clearance percentage.

Load and bearing dimensions

Radial load, bearing bore, and bearing length are needed to establish projected pressure and contact conditions.

Shaft diameter and speed

Together these establish sliding speed; RPM alone cannot produce a PV check.

Fluid and lubrication

Provide the chemical name, concentration, viscosity where relevant, solids, and whether lubrication is continuous, intermittent, or absent.

Temperature and atmosphere

Give actual bearing temperature, start-up and upset conditions, and gas/oxygen environment where applicable.

Shaft, housing, and fit

Provide materials, surface finish, fit method, assembly temperature, and drawing tolerances so installed clearance can be checked.

Bearing life, wear rate, and safe operating clearance cannot be inferred from a grade name alone. Confirm the final dimensions and operating limits with the selected manufacturer.

Compare general graphite material families before requesting a grade-specific pump-duty review.

Pump-duty decision check

The selector only uses three broad inputs. Use this checklist to decide what must be confirmed before a grade is specified.

Water or condensate

Confirm exact temperature, pressure, fluid condition, start-stop duty, and the selected manufacturer grade.

Hot oil or hydrocarbons

Confirm viscosity, chemistry, temperature, load, and the required shaft counterface.

Corrosive chemicals

Name the chemical, concentration, contaminants, and temperature; use a compatibility chart for that service.

Review chemical-service material guidance

Dry gas or intermittent dry run

Confirm atmosphere, projected pressure, surface speed, heat removal, and start-up conditions.

Service trade-offs and failure risks

Carbon/graphite bearing behavior changes with lubrication, contamination, fit, and duty. Confirm mitigations on the actual pump design.

Dry running and heat
A suitable grade may operate without supplied oil, but dry duty can increase friction and wear. Compare the actual pressure and sliding speed with grade data, and confirm cooling and start-up conditions.
Solids and abrasion
Abrasive particles can score carbon/graphite and accelerate wear. Identify solids and particle loading; discuss filtration, flushing, grooves, or a different bearing arrangement with the supplier.
Fit and procurement
An unsuitable press fit or operating clearance can cause contact or instability. Grade availability, inspection, and cost depend on the drawing and supplier; include material, tolerance, quantity, and documentation requirements in the RFQ.

Two examples of how to use the screen

These examples show the tool's decision boundary; neither is a bearing-life or grade-performance prediction.

Steady water duty below 100°C

Screen: phenolic resin-impregnated carbon/graphite is a starting family to discuss.

Next: confirm pressure, water condition, load, speed, drawing, and the exact grade datasheet.

Corrosive fluid or elevated temperature

Screen: engineering review required; no impregnant is selected.

Next: provide exact fluid and concentration, actual temperature, pressure, load, surface speed, and start-stop duty.

Send pump duty details for review

Reference Sources

  • Carbon & Graphite Solutions for Mechanical Applications
    Grade-specific examples for resin, PTFE, antimony, and oxidation-resistant carbon/graphite temperature limits. These maxima apply to the listed grades and are not universal bearing ratings.
    Mersen: Carbon & Graphite Solutions for Mechanical Applications
    accessed October 2, 2026
  • 5 Tips for Minimizing Carbon Graphite Bearing Wear
    Explains why load, sliding speed, lubrication, and abrasive particles affect wear and PV; the article cautions that bearing performance is application-specific.
    Metcar: 5 Tips for Minimizing Carbon Graphite Bearing Wear
    accessed October 2, 2026
  • Graphilor corrosion resistance chart
    Shows that compatibility depends on the exact fluid, concentration, and temperature; the chart also marks cases with no published data.
    Mersen: Graphilor corrosion resistance chart
    accessed October 2, 2026
  • Treatment Services
    Describes common graphite impregnation families and their broad treatment purposes; the final grade still needs application-specific confirmation.
    Semco Carbon: Treatment Services
    accessed October 2, 2026

Frequently Asked Questions

Why choose carbon graphite for pump bearings instead of bronze or plastics?
Carbon graphite can run without an oil or grease supply in suitable designs and is used in submerged pump applications. It is not universally chemically inert or immune to seizure: grade, fluid, temperature, shaft finish, load, and fit still matter. Compare those conditions with the proposed grade and competing bearing materials.
Does hot condensate automatically require antimony impregnation?
No single impregnation is a universal rule. Antimony can reduce porosity and improve mechanical strength in some manufacturer grades, but the pump pressure, exact temperature, fluid properties, start-stop duty, shaft counterface, and supplier grade data must be reviewed together.
What is the maximum operating temperature for a carbon graphite bearing?
There is no universal limit. Published maxima differ by manufacturer and grade. For example, the Mersen mechanical-applications brochure lists 200°C for its resin-impregnated grades, 250°C for a PTFE grade, and 450°C for an antimony grade. Treat these as examples from that brochure, not as ratings for an unspecified pump bearing; confirm the exact datasheet and atmosphere.
Can carbon graphite bearings run dry?
Some carbon/graphite bearing grades are designed for dry running, but allowable duty depends on grade, projected pressure, sliding speed, heat removal, atmosphere, and start-stop cycles. RPM alone is not enough to calculate PV. Ask the supplier to confirm the duty point and required cooling or lubrication.
How should I specify shaft fit and running clearance?
Provide the shaft and housing dimensions and materials, fit method, temperatures at assembly and operation, shaft speed, and the bearing drawing. The supplier should calculate the installed bore and operating clearance for the selected grade and geometry; a generic percentage is not a substitute for that calculation.
What information is needed to review a chemical pump duty?
Send the chemical name and concentration, temperature range, pressure, contaminants or solids, cleaning fluids, and whether the service is continuous or intermittent. Compatibility charts can contain temperature-dependent ratings or no-data cases, so an exact fluid description is essential.
Which values should I include in an RFQ for a pump bearing?
Include the part drawing and tolerances, shaft diameter and finish, bearing length and housing fit, radial load, RPM or surface speed, operating and start-up temperatures, fluid composition, lubrication state, solids, quantity, inspection needs, and destination. State any export paperwork, packing, or handling requirements, and mark unknown values for engineering review.

Ready to specify your pump bearings?

Send us your pump parameters, drawings, and chemical duty. We will verify the grade and assist with interference fit and clearance calculations.

Sourcing dynamic face rings for rotating mechanical seals? Review our carbon graphite seals for pump service guide to evaluate PV limits, helium light-band flatness, and blister resistance.

Designing cylindrical sleeves or flanged liners? Explore our carbon graphite bushings fit and PV screening tool to calculate press-fit bore closure and thermal clearance.

For factory procurement and supplier qualification, consult our carbon graphite bushings supplier qualification guide to review impregnation grades, air-gage metrology, and lead times.

For shipment planning, see our carbon graphite bearing export guidance and include destination, packing, and documentation needs in your RFQ.

Prefer a web inquiry? Contact our team with your drawing and pump duty details.

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