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The Rotax MMH (for 912 etc) specifies Loctite (copper-based) anti-seize compounds for coating the exhaust system couplings, flanges, and mounting bolts etc.  But it seems nickel-based compounds are kinder to stainless steel at elevated temperatures.  I am interested in any experiences and/or opinions on this.  In particular the appropriate compound for coating the exhaust manifold pipe where it enters into the aluminium cylinder block.

The following link is interesting:
Copper vs Nickel Anti-Seize: An Overview - MFG Shop

and makes the following point:

Metal Compatibility

  • Copper Anti-Seize: Generally compatible with most metals but may cause intercrystalline corrosion on stainless steel.
  • Nickel Anti-Seize: Safe for use with stainless steel and high-alloy metals, preventing galvanic corrosion.
  • Re: Nickel vs Copper based anti-seize

    by » 3 weeks ago


    I have stopped to use a coper based on. I wanted to buy something Al or Ni based, but I was not able to buy anything in reasonable time.

    Therefore now I use a non-metallic one: "Wurth HSP 1400". For couple of years (literally 2 :) ) with good results, as for now.  Not very cheap but was available in a shop I use locally.

    I do not know its availability in non-EU regions, but I have found the following e-shop with English product description:

    https://shop.wurth.ca/lubricants-greases/lubricants/hsp1400-high-temperature-lubricating-paste/HIGH-TEMPERATURE-LUBRICATING-PASTE-HSP-1400-300-mL/893.123/

    Does anybody think it may have some disadvantages in longer term? Any thoughts?

    Stefan.


  • Re: Nickel vs Copper based anti-seize

    by » 3 weeks ago


    I use nickel on stainless steel.

    Nickel Anti-Seize and Lubricating Compound is a nickel-based formulation that is free of copper, lead, sulfides and chlorides. This premium high temperature lubricant protects metal-to-metal applications from seizing and galling caused by high temperatures, heavy loads, vibration, chemicals and corrosion. Chemically inert nickel formulation is safe for use with most chemicals that are unstable with copper. This product has extremely high temperature capabilities and excellent chemical resistance. Regular use of Nickel Anti-Seize will increase performance and prolong equipment life.
    II. Applications
    Recommended to lubricate metal-to-metal applications where a clean, chemically inert, copper-free formulation is necessary. Will not poison catalyst beds, reaction chambers, or special alloy fittings. May be used on fittings,
    bushings, flanges, headers, nuts, screws, studs, threaded surfaces, pipes, plugs, and manifolds to prevent seizing and galling of surfaces.
    III. Features & Benefits
    • Copper-Free Formulation. For use where a clean, chemically inert and stable lubricant is required.
    • Extremely High Temperature Resistance. Protects parts up to 2400° F.
    • Electrically Conductive. Does not insulate and interrupt current flow.
    • Good Choice for Use on Soft Metal Applications. Does not compromise integrity of soft metals.
    • Safe For Use on Both Ferrous and Non-Ferrous Metals.
    • Will Not Harden. Heat aging won’t affect lubricity of product.
    • Resistant to Mild Detergents & Alkaline Wash. Protects against rust and corrosion.
    • Facilitates Fast & Easy Disassembly. Saves time in taking apart components

     

    Copper Anti-Seize and Lubricating Compound is a general purpose anti-seize lubricant that prevents seizing and galling caused by high temperatures, heavy loads, vibration and corrosion. This unique formula has a smooth texture, fine particle sizing and familiar copper color, making it an excellent choice for closely fitted parts that need extreme lubrication. Regular use of Copper Anti-Seize will increase performance and prolong equipment life.
    II. Applications
    Recommended to lubricate fittings, bushings, flanges, headers, nuts, screws, studs, threaded surfaces, pipes, plugs, and
    manifolds to prevent seizing and galling of surfaces.
    III. Features & Benefits
    • Copper-Based. Safe for use on both ferrous and non-ferrous metals.
    • High Temperature Resistance. Protects parts up to 1800° F.
    • Electrically Conductive. Does not insulate and interrupt current flow.
    • Good Choice for Use on Soft Metal Applications. Does not compromise integrity of soft metals.
    • Will Not Harden. Heat aging won’t affect lubricity of product.
    • Facilitates Fast & Easy Disassembly. Saves time in taking apart components.


    Roger Lee
    LSRM-A & Rotax Instructor & Rotax IRC
    Tucson, AZ Ryan Airfield (KRYN)
    520-349-7056 Cell


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