Huahao Sealing · Carbon Graphite Components
Decades of industry experience solving sealing challenges in the world’s most demanding industrial sectors.
Our seals are widely used in centrifugal pumps, chemical pumps, water pumps, and oil pumps for rotating shaft sealing. Carbon graphite's self-lubricating properties make it ideal for high-speed rotating equipment, significantly improving pump operating stability and extending overhaul cycles.
Marine environments require exceptional corrosion resistance. Our specially impregnated carbon graphite seals and bearings withstand long-term seawater corrosion while maintaining dimensional stability under variable loads and impact conditions.
Chemical reactors, agitators, and process pumps require seals that resist aggressive media. Our impregnated carbon graphite grades offer excellent chemical inertness, resisting strong acids, bases, and organic solvents.
Power plant circulating water pumps, nuclear auxiliary pumps, and turbine oil pumps all rely on reliable sealing and bearing components. Carbon graphite's high-temperature resistance (up to 600°C) ensures dimensional stability in high-temperature steam and thermal media conditions.
Food and pharmaceutical machinery requires strict hygiene and safety standards. Our food-grade resin-impregnated carbon graphite runs completely oil-free with zero contamination risk, complying with FDA and EU food contact material standards.
Heavy-duty equipment like slurry pumps, mill lubrication systems, and dust fans demand exceptional wear resistance. Carbon graphite's self-lubricating and thermal shock resistance properties deliver long service life in harsh environments with solid particles and high dust.
Oil pumps, natural gas compressor bearings, and LNG pump seals require materials that remain stable under extreme conditions. Carbonized and specially impregnated carbon graphite grades maintain chemical inertness and dimensional accuracy in oil and gas media, meeting API standards.
Valve stem seals, compressor seals, agitator seals, and custom industrial equipment sealing solutions. Carbon graphite's flexible machinability and wide grade selection make it adaptable to complex installation spaces and operating conditions.
Huahao Sealing supplies carbon graphite seal rings, bushings and bearings for petroleum refining. Antimony-impregnated grades handle 500°C, carbonized grades reach 600°C for FCC pumps, vacuum bottom pumps and sour crude service, meeting API 682 requirements.
Huahao Sealing provides carbon graphite seal rings and bearings for ammonia, urea and phosphate fertilizer plants. Resin-impregnated grades handle 220°C with resistance to ammonia, urea liquor, phosphoric acid and caustic; carbonized grades reach 600°C for high-pressure carbamate pumps and ammonia service.
Huahao Sealing provides carbon graphite seal rings, bushings and thrust discs for the pulp & paper industry — black liquor pumps, white liquor pumps, dryer condensate pumps and press roll bearings. Antimony grades handle 500°C, resist caustic corrosion and abrasive fiber/filler wear, extending overhaul cycles beyond 12 months.
Huahao Sealing provides ultra-high-purity carbon graphite seal rings and bearings for semiconductor dry vacuum pumps, mechanical vacuum pumps and plasma etch chamber rotary seals. Zero metal-ion leaching, zero grease contamination, SEMI-compliant, rated for 10⁻⁹ Torr ultra-high vacuum and corrosive process gases (CF₄, SF₆).
Huahao Sealing provides purpose-built carbon graphite seal rings for textile dyeing — high-temp dyeing machines, dye liquor circulation pumps and stenter guide roll bearings. Resistant to high-temp dye liquor (130-180°C) and chemicals (acids, alkalis, reducers), self-lubricating to prevent oil stain on fabric, extending seal life beyond 18 months.
Huahao Sealing provides carbon graphite stern shaft seals, seawater cooling pump bearings and rudder bearings for marine and offshore. Special seawater-corrosion-resistant impregnation, chemically inert against chloride attack, dimensionally stable in wet/dry cycling, DNV-certified for commercial vessels, naval ships and offshore platforms.
Huahao Sealing provides FDA food-grade resin-impregnated carbon graphite seals for the food and pharmaceutical industry. Completely oil-free self-lubricating operation with zero metal-ion leaching and grease contamination risk, compliant with FDA and EU food contact material standards and HACCP requirements, suited for mixers, fillers, transfer pumps and CIP equipment.
Huahao Sealing provides carbon graphite seal rings, bearings and thrust discs for power generation — circulating water pumps, turbine lube oil pumps, nuclear auxiliary pumps and CHP heat supply pumps. High-temp steam service (≤600°C), self-lubrication for dry running during oil pump failure, large-size bearings for 120mm+ shaft pumps, extending overhaul cycles beyond 15 months.
Huahao Sealing provides carbon graphite seal rings, vanes and bearings for vacuum pumps — dry mechanical vacuum pumps, rotary vane pumps and Roots pumps. Carbon graphite self-lubrication avoids oil contamination of vacuum systems; high-purity grades with low outgassing suit 10⁻⁶ Torr high vacuum; 350°C rating suits bake-out degassing processes.
Huahao Sealing supplies carbon graphite piston rings, packing seal rings and bearings for compressors — reciprocating, screw and centrifugal types. Carbon graphite self-lubrication enables oil-free operation for process gas, air, natural gas, hydrogen and CO₂ dry sealing service; rated 25 MPa pressure and 350°C temperature, paired with SiC mating face for high-speed wear resistance.
Carbon graphite seals perform reliably across a wide range of operating conditions. Below are typical parameters for common industrial applications.
| Industry / Application | Temperature Range | Pressure | Speed | Medium | pH Range |
|---|---|---|---|---|---|
| Centrifugal & Process Pumps | -50°C ~ 260°C | ≤ 20 MPa | ≤ 25 m/s | Water, oil, chemicals, slurries, hydrocarbons | 0–14 (varies by grade) |
| Marine Stern Shaft & Seawater Pumps | -20°C ~ 150°C | ≤ 10 MPa | ≤ 15 m/s | Seawater, brine, marine lubricants | 6–10 |
| Chemical Reactors & Agitators | -50°C ~ 350°C | ≤ 25 MPa | ≤ 10 m/s | Strong acids, alkalis, organic solvents, corrosive chemicals | 0–14 (corrosion-resistant grade) |
| Power Plant Circulating & Heat Supply Pumps | 0°C ~ 250°C | ≤ 16 MPa | ≤ 20 m/s | Cooling water, hot water, steam, thermal oil | 6–10 |
| Food & Pharmaceutical Machinery | -20°C ~ 150°C | ≤ 10 MPa | ≤ 10 m/s | Food slurries, chocolate, pharmaceuticals, CIP fluids | 3–11 (food-grade) |
| Mining Slurry & Metallurgical Equipment | -20°C ~ 200°C | ≤ 15 MPa | ≤ 12 m/s | Ore slurry, mud, solid-containing media | 4–12 |
| Oil & Gas Transport | -50°C ~ 300°C | ≤ 25 MPa | ≤ 20 m/s | Crude oil, natural gas, LNG, oilfield chemicals | 4–12 (oil-resistant grade) |
| General Industrial Equipment | -30°C ~ 280°C | ≤ 15 MPa | ≤ 20 m/s | Compressed air, steam, gases, lubricating oil | 4–12 |
| Submersible & Wastewater Pumps | 0°C ~ 80°C (short-term 120°C) | ≤ 5 MPa | ≤ 10 m/s | Clean water, wastewater, sludge, particle-containing media | 5–10 |
| Air Compressors & Pneumatic Equipment | -20°C ~ 200°C | ≤ 2.5 MPa | ≤ 25 m/s | Compressed air, nitrogen, inert gases, oil-laden gases | 6–8 |
| Hydraulic Equipment & Valves | -30°C ~ 150°C | ≤ 35 MPa | ≤ 5 m/s | Hydraulic oil, lubricating oil, emulsions | 6–9 |
Tell us your operating conditions and our engineers will recommend the best sealing solution.
