Carbon graphite mechanical seals are drop-in OEM-interchangeable Alfa Laval pump mechanical seal replacements for LKH, SolidC and MR series water pumps. Featuring FDA-grade self-lubricating carbon graphite faces, this Alfa Laval mechanical seal resists thermal shock from CIP/SIP cycles, allows dry-run tolerance during tank emptying, and uses an open hygienic geometry for tool-free cleaning—supplied direct from our ISO 9001 factory at competitive cost.
Key Features
• Alfa Laval Standard: A direct replacement for the standard carbon graphite mechanical seals used in Alfa Laval centrifugal pumps (e.g., LKH, SolidC) handling water, beer, or non-abrasive fluids.
• FDA Carbon Grade: Uses high-purity, food-grade Carbon Graphite faces that meet FDA 21 CFR 177 standards for direct contact with food products.
• Self-Lubricating: The carbon face provides excellent self-lubrication, protecting the carbon graphite mechanical seal during momentary dry runs often encountered in tank emptying cycles.
• Thermal Shock Resistance: Carbon graphite handles rapid temperature changes (e.g., cold water to hot CIP) better than ceramic, preventing face cracking.
• Hygienic Design: The alfa laval pump mechanical seal geometry is open and smooth, allowing for effective cleaning during CIP (Clean-In-Place) cycles without disassembly.
Product Specifications
Graphite chemical property | ||||||||
Category | Model | Density (g/cm) | Fractural Strength (MPa) | Compressive Strength (MPa) | Shaw Hardness (HS) | Porosit y(%) | Temperature (℃) | |
Carbon-graphite | Impregnated Epoxy Resin (H) | M106H | 1.75 | 65 | 200 | 85 | <1 | 250 |
M120H | 1.7 | 60 | 180 | 80 | <1 | 250 | ||
Impregnated Furan Resin (K) | M106K | 1.75 | 67 | 200 | 90 | <1 | 250 | |
M120K | 1.7 | 62 | 180 | 85 | <1 | 250 | ||
Impregnated Phenol Aldehyde Resin (F) | M106F | 1.75 | 60 | 200 | 85 | <1 | 250 | |
M120F | 1.7 | 55 | 180 | 80 | <1 | 250 | ||
Antimony Carbon (D) | M106D | 2.3 | 65 | 220 | 90 | <1.5 | 400 | |
M120D | 2.3 | 60 | 220 | 90 | <1.5 | 400 | ||
M254D | 2.3 | 55 | 210 | 65 | <1.5 | 450 | ||
Operating Limits | Units | M106D |
Imperegnated material | Slibium-allay | |
Shaw Hardness | HS | ≥90 |
Indicated Parosity | % | ≤2.0 |
Volume Density | g/m³ | ≥2.20 |
Compressive Strength | Mpa | ≥240 |
Flexural Strength | Mpa | ≥70 |
Coefficient Of Heat Expansion | 10-6·1/℃ | 7.2 |
Using Temperature | ℃ | ≤400 |
Workshop
This workshop is equipped with professional processing equipment and integrated with standardized material warehousing management, enabling a one-stop production process from precision machining to finished product delivery. It ensures part machining accuracy and production efficiency, meeting various high-specification manufacturing requirements.
Product Research, Development and Testing
Our Product R&D and Testing focuses on optimizing seal performance through advanced simulation and material analysis. All alfa laval pump mechanical seals undergo rigorous trials, including thermal cycling and pressure tests, to ensure durability, minimal leakage, and long service life in demanding industrial environments.
Industry Solutions
Case Study
Brewery Transfer: A brewery was using expensive SiC seals on water and wort pumps. We switched them to these Carbon/Graphite seals. The carbon handled the clean fluids perfectly, reducing seal costs by 40% while maintaining hygiene standards.
Testimonials
A cost-effective alternative for our LKH water pumps. The carbon quality is excellent and we've had zero contamination issues.
—Maintenance Supervisor, Brewery
FAQs
Q: Is this seal suitable for abrasive fluids?
A: No, Carbon is relatively soft. If you are pumping fluids with yeast, grains, or sugar crystals, you should upgrade to Silicon Carbide (SiC) faces to prevent premature wear. Carbon is best for clean liquids.
Q: Are carbon graphite mechanical seals a direct drop-in replacement for Alfa Laval LKH, SolidC and MR series water pumps?
A: Yes. Our carbon graphite Alfa Laval pump mechanical seal follows the original OEM envelope, gland bolt pattern and 12 mm shaft size—no pump modification needed. It is 100% dimensionally interchangeable for LKH-5 through LKH-60, SolidC and MR series clean-water service.
Q: Why choose carbon graphite faces instead of ceramic or SiC for Alfa Laval water pumps?
A: Resin-impregnated FDA-grade carbon graphite is self-lubricating and tolerates brief dry-run during tank emptying. It also absorbs thermal shock from cold-water-to-hot-CIP swings better than ceramic, while costing less than SiC/SiC pairs.
Q: Can this Alfa Laval pump mechanical seal handle CIP/SIP cleaning and food-contact hygiene?
A: Absolutely. The open hygienic geometry allows tool-free CIP cleaning without disassembly, the carbon face is non-porous FDA 21 CFR 177-compliant.
Our company is specialized in the production of sealing materials, mechanical seals , cartridge seals.
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