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Neolube No.1 Lubricant, MIL-L-24131C



Neolube No. 1 is a dry film, conductive lubricant, used extensively at nuclear power generating plants and other nuclear facilities as an anti-seize compound, thread lubricant and for lubricating moving parts and rubbing surfaces.

The composition of this material is 99% pure furnace graphite particles, a thermoplastic resin and  isopropanol.

The material has excellent radiation resistance and high chemical purity. 

The thin, non-corrosive film of Neolube No. 1 prevents seizing, fretting, galling and resists abrasion. 

It is easy to apply by spray, dip or brush and has excellent adhesion after a fast air dry. 






Neolube No. 1 is a dry film, conductive lubricant, used extensively at nuclear power generating plants and other nuclear facilities as an anti-seize compound, thread lubricant and for lubricating moving parts and rubbing surfaces.


The composition of this material is 99% pure furnace graphite particles, a thermoplastic resin and  isopropanol.  The material has excellent radiation resistance and high chemical purity.  The thin, non-corrosive film of Neolube No. 1 prevents seizing, fretting, galling and resists abrasion.  It is easy to apply by spray, dip or brush and has excellent adhesion after a fast air dry.  The dry film of Neolube No. 1 will not migrate and it is non freezable.


Neolube No. 1 has satisfied the stringent requirements for lubricating the internal and auxiliary equipment mechanisms of commercial and naval nuclear reactor systems.  Neolube No. 1 allows easy assembly, trouble-free operation and non-destructive disassembly.  Neolube No. 1 provides non corrosive, dry adherent lubrication for metal parts with limited clearances in applications where control of impurities is required.


Neolube No. 1 is NOT RECOMMENDED FOR LUBRICATING THREADS IN THE REACTOR PRIMARY CONTAINMENT AREAS, where operating temperatures for the fittings are greater than 400°F.  Neolube No. 1260 is recommended for use in containment and/or secondary side in nuclear applications. 


A Certificate of Quality Conformance and Analysis is available for each lot upon request.


Neolube No. 1 has been used successfully in applications where it has withstood radiation levels of 1 x 109 rads.




         Physical and Chemical Requirements




Total Solids Content, weight percent

  Graphite Content, percent of total solids


3.3% +/- 0.50%

75% +/- 5%


Particle size, microns

Maximum dimensions of 90% of the particles

Maximum dimensions of any particle



  4 Microns

10 Microns


Ash, weight percent, maximum on total solids

Fluorine, parts per million, maximum on total solids

Chlorine, parts per million, maximum on totalsolids

Sulfur, parts per million, maximum on total solids

Lead, parts per million, maximum on total solids



20 PPM

200 PPM

200 PPM

150 PPM


Film Properties (regular & irregular surfaces):












The coated surface will be dry and will not become exposed when subjected to light abrasion.


Film continuity will not be broken, and metal surfaces will not be exposed.


Dry, non-oily.


Characteristic of isopropanol, no odor of halogenated solvents will be detected.


Mercury:    Instruments and equipment containing mercury or compounds of mercury were not used in the manufacture and packaging of the lubricant, nor in testing and inspection, unless samples were discarded after the test.  During the manufacturing processes, tests, and inspection, Neolube No. 1 did not come in contact with mercury or any of its compounds nor any mercury-containing devices employing a single boundary of containment.  Compounds containing boron were not used in cleaning,  processing equipment, or containers.


There is no intentional addition of low melting point metals such as lead, bismuth, zinc, mercury antimony, cadmium, tin, silicon, gallium, indium or arsenic to this product; nor of copper or silver. MeOH is not a component of Neolube No.1. This product is not approved by NSF for drinking water applications.



                                   Physical Properties:(As Supplied):


Lubricant Processed micro graphite   Service Temperature   400°F (204°C)
Binder Thermoplastic Resin    Intermittent Temperature  850°F (454°C)
Diluent Isopropanol   Color Black
Consistency Liquid   Solids Content  3.30% +/-  0.50%
Density  6.6 lb./gal (0.791 kg/l)   Flash Point 52°F (11°C
Shelf Life No limit in a closed container   Coefficient of Friction 0.15 (Static)





Neolube No. 1, is supplied in a ready-for-use form conforming to the requirements of MIL-L-24131C.  If further dilution is required by the application, add isopropanol while stirring thoroughly.




Substrates should be clean and dry before application.  A solvent wipe and air dry is usually sufficient.  For critical applications requiring maximum adhesion, the following pretreatment is recommended:


Steel             Degrease, sand or vapor blast and/or phosphate coat.

Aluminum          Degrease, sand or vapor blast, degrease, Meta Etch or anodize.

Stainless Steel         Degrease, sand or vapor blast and/or Granodine 16 (Amchem)

Copper Alloys           Degrease, sand or vapor blast, degrease, dilute nitric acid dip and water rinse.

Rubber                  Clean with appropriate solvent.

Plastic                 Sand lightly, wipe with appropriate solvent.






Shake or agitate well before using.  Apply with the brush in cap applicator or by conventional spray, brush or dip methods.


                                        Cure Time:


Material dries in approximately five minutes to the touch depending on temperature and humidity.  Full cure properties up to two hours depending on thickness, temperature and humidity.




Neolube No. 1 is packaged in 2 ounce and 8 ounce non-halogenated plastic bottles with a brush in cap applicator.


Employ the customary safeguards in storing, handling and applying flammable material of this type. Use with adequate local exhaust ventilation if product is sprayed. Avoid prolonged contact with eyes, skin and clothing.
(See the Material Safety Data Sheet for proper first aid instructions.)
Containers must be tightly resealed to prevent evaporation and contamination.



Qualification Approval: Approving organization is the Naval Ship Engineering Center, Hyattsville, Maryland 20782.  The date of the approval letter is 21 June 1974, Test Report Number (QPL) 10744.




The data contained herein are furnished for information only and are believed to be reliable.  We cannot assume responsibility for the results obtained by others over whose methods we have no control.  It is the user's responsibility to decide suitability for the user's purchase of any production methods mentioned herein and to adopt such precautions as may be advisable for the protection of property and of persons against any hazards that may be involved in the handling and use thereof.  Considering the above.  Huron Industries, Incorporated specifically disclaims all warranties of merchantability or fitness for a particular purpose arising from sale or use of Huron's products.  Huron Industries, Inc., specifically disclaims any liability for consequential or incidental damages of any kind, including lost profits.  The discussion herein of various processes or compositions is not being interpreted as representation that they are free from domination of patents owned by others or as a license under any Huron Industries's patents that may cover such processes or compositions.  We recommend that each prospective user test the proposed application to determine its suitability for the purposes intended before incorporating any product or application in its manufacturing process using this data as a guide.  This product may be covered by one or more United States or foreign patents or patent applications.  The recording of false, fictitious or fraudulent statements or entries on this document may be punished as a felony under Federal Statutes including Federal Law, Title 18, Chapter 47.

Printed in U.S.A.  Revised: 02/28/13    

©Copyright 2013 by Huron Industries, Inc.

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 Neolube® Products

Trademarks are the properties of their respective owner(s).

March 2022, October 2020, ... updated August 2014. April 2012, March 2012 CSS,

The descriptions, illustrations, specifications, dimensions, and part numbers are subject to change without notice.

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