Antimony-impregnated graphite is produced by high-pressure impregnation of carbon graphite with molten antimony metal, forming a metallic network in the micropores to raise density to about 2.2 g/cm³ (third-party tested: 2.20 g/cm³ density, 2% porosity, 190 MPa compressive strength, 92 HS). Huahao Sealing's M106D grade is rated 500°C with anti-oxidation treatment, offering high hardness and excellent wear resistance for high-temperature oil pumps, compressors and petrochemical equipment.
| Density | 2.15 – 2.25 g/cm³ (tested 2.20) |
| Temperature | -200°C ~ 500°C |
| Compressive Strength | 180 – 200 MPa (tested 190) |
| Shore Hardness | 85 – 105 HS |
| Porosity (after impregnation) | ≤ 2% (tested 2%) |
| Friction Coefficient | 0.05 – 0.12 |
| Anti-Oxidation Treatment | Yes (proprietary) |
| Impregnant | Antimony (Sb) metal |
High temperature 500°C — antimony metallic network offers excellent heat resistance, with anti-oxidation treatment for stable 450-500°C continuous operation
High hardness and wear resistance — impregnation raises hardness to 85-105 HS, wear resistance 60-80% better than standard graphite
Low porosity — post-impregnation porosity below 1.5%, suitable for high-pressure sealing applications
Excellent thermal conductivity — antimony metal's high thermal conductivity dissipates heat rapidly, preventing seal face hot spots and thermal cracking
Chemical stability — remains stable in sour crude and mild acids/alkalis, with no galvanic corrosion
High-temperature oil pumps — FCC unit and vacuum tower bottom pumps
Compressor seals — natural gas compressor piston rod sealing
Petrochemical equipment — sour crude transport pumps, reactor agitator shafts
Power plant equipment — circulating water pumps and heat supply pump bearings
Metallurgical equipment — hot rolling mill lubrication system seals
| Grade Code | Temperature | Notes |
|---|---|---|
| M106D | 500°C | Antimony + anti-oxidation, general high-temp grade |
| M120H | 500°C | High-density antimony, higher pressure rating |
Antimony impregnation (M106D) fills graphite micropores with molten antimony metal, rated 500°C, with high hardness and good thermal conductivity. Carbonization (M191T) is a high-temperature graphitization treatment, rated 600°C, with higher chemical inertness but slightly lower hardness. Below 500°C choose antimony; for 500-600°C choose carbonized.
No. Antimony-impregnated grades remain chemically inert in sour crude and sour water. Sulfur ions do not attack the antimony metal or graphite matrix, with no swelling or pitting over long-term operation. It is widely used in FCC oil pumps and sour crude transport pumps.
No. Antimony is a heavy metal unsuitable for food contact. Food-grade applications should use resin-impregnated grade (M106K) that meets FDA standards. Antimony-impregnated grades are designed for industrial high-temperature, high-pressure and heavy-duty service.
Submit your duty parameters (temperature, pressure, media, speed) — engineers reply with grade selection and quotation within 24 hours.
