Huahao Sealing supplies carbon graphite bearings, bushings and thrust discs for chemical process pumps handling acids, alkalis, salts and organic solvents. Carbon graphite is non-metallic, so there is no galvanic or pitting corrosion, and it is chemically inert across pH 0-14. Self-lubrication at friction coefficient 0.04-0.15 removes external lubrication for oil-free pharmaceutical, food and electronic-grade duty. Impregnation sets the temperature boundary — resin 220°C, antimony 500°C, carbonized 600°C — and parts drop into ANSI, HG, IMC and FZB bearing housings.
Chemical pump media span acids, alkalis, salts and organic solvents; metallic bearings fail by galvanic corrosion coupled with abrasive wear — once a pit forms, particles embed in it, the wear accelerates and clearance widens until the shaft seizes
Lean liquid, no liquid or easily vaporized media (light hydrocarbons, organic solvents, gas-liquid mixtures) cannot build a stable film in the bearing gap, so the material itself must supply lubrication
Service temperature spans a wide band, from cold solvents to hot oil and reactor circulation loops, so one bearing must satisfy both the temperature and the chemical resistance boundary at the same time
ANSI, HG, IMC and FZB chemical pump types use non-interchangeable housing diameters, lengths and fits; replacements must match OEM dimensions and tolerances or misalignment produces one-sided wear
Pharmaceutical, food and electronic-grade media forbid any external lubricant contamination — the bearing runs on its own material, and the impregnant must not leach into the medium
Carbon graphite is a non-metallic material system — no galvanic corrosion, no pitting — and remains chemically inert across pH 0-14 against most acids, alkalis, salts and solvents, removing the corrosion-wear coupling that kills metal bearings
Select the impregnation by temperature and media: resin 220°C, antimony 500°C, carbonized 600°C; above the resin boundary switch directly to antimony or carbonized grades for higher chemical inertness
The transfer film keeps the friction coefficient at 0.04-0.15, so oil-free and lean-liquid duty needs no external lubrication and the medium stays uncontaminated, while 8-70 W/m·K thermal conductivity carries friction heat away
Drop-in bearing sizes for ANSI, HG, IMC and FZB housings, custom-finished outer diameter, bore, length and debris grooves from your drawing, ground to micron tolerance so no rework is needed at assembly
| Temperature | -50°C ~ 600°C (grade dependent) |
| Media | Acids, alkalis, salts, organic solvents |
| pH Resistance | 0 – 14 |
| Radial Load | ≤ 20 MPa (GB series) |
| Grade | M106K (Resin) / M106D / M106H (Sb) / M191T (Carbonized) |
| Pump Types | ANSI / HG / IMC / FZB bearing housings |
No electrochemical corrosion occurs. Carbon graphite is non-metallic and its base is carbon, so it is chemically inert toward most acids, alkalis, salts and organic solvents and stable across pH 0-14. There is no pitting, dezincification or galvanic attack as on metal bearings, and no pit-initiated particle embedment. Only strongly oxidizing media need a separate assessment — see the next question.
Yes, provided it is fitted to the original bearing-housing dimensions. We stock common ANSI, HG, IMC and FZB sizes and build from drawings; four items must be confirmed — the outer diameter fit in the housing, the single-side radial clearance to the shaft (typically 0.10-0.15 mm), overall length and relief grooves, and the position of purge or debris grooves. Parts are ground to micron tolerance so no rework is needed at assembly. Carbon graphite is more brittle than bronze, so press it in with a guide sleeve under even load — never hammer it.
Strong oxidizers such as concentrated nitric acid, chromic acid, peroxides and hypochlorites attack the impregnation resin first and then slowly oxidize the carbon matrix. Avoid phenolic and epoxy impregnation in this duty, switch to carbonized or antimony-impregnated grades and keep the temperature down; a weight-loss immersion test at service temperature is recommended before series supply. Oxidation onset in air: roughly 420°C unimpregnated, 500-550°C resin-impregnated, 600-650°C antimony-impregnated — check hot oxidizing service against that boundary.
The controlling factor is whether the actual PV stays continuously below what the material allows. Resin-impregnated grades are recommended at 0.8-1.2 MPa·m/s for continuous duty, while a dry or broken-flow instant can drive PV to 2.1 MPa·m/s, so frequently started pumps should take furan or antimony impregnation with thermal margin. Antimony grades reach 85-105 HS and carry heavier loads better. Send us medium temperature, solids content and start-stop frequency and we will specify the grade and an expected life range.
Submit your duty parameters — our engineers reply with grade selection and quotation within 24 hours.
