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DRY Film Lubricants & Liquid Coatings

What are Dry Film Lubricants?

“Dry Film Lubricants”,(DFLs) also called solid film lubricants (SFLs), are:

  1. Materials with inherent lubricant properties.
  2. Firmly bonded to the surface of a substrate.
  3. Applied in the liquid state, generally by spray, tumble coater, or bath immersion.
Dry Film Lubricants

Unlike wet lubricants, i.e. oil, grease that stay ‘wet’ while on the part, dry film lubricants go on wet, but then dry on the part it has been applied to. Particles do not stick to dry lube. Dry lube does not require any maintenance like wet lube. DFLs can be powder or liquid coatings such as PTFE, Xylan®, Epoxy, Polyester or Urethane.

The range of coatings includes environmentally friendly and REACH compliant coatings, as well as air cured, high temperature and PTFE. Among the solid film lubricants coatings we offer are Everlube®, Microseal®, Lube-Lok®, Lubri-Bond®, Ecoalube®, Ever-Slik®, Esnalube™, Perma-Slik®, Electrobond®, Flurene® , Formkote® and Henco-Mask™.

Dry film lubricants are made up of a combination of resin binders and lubricating pigments. The resin holds the lubricating pigment in place so that a layer interposes between the rubbing surfaces. As the surfaces move, the coating prevents direct contact of the substrate materials.
DFLs create a “Slippery” Factor

Without SFL
Fretting and galling of the substrate


With SFL
Protective layer created between substrates

Dry Film Lubricants

Properties of Dry/Solid Film Lubricants

Solid film lubricants (SFLs) have varying properties, depending on their structure and composition. For example, SFLs excel in:

  • High load applications
  • Applications where a very low coefficient of friction is desired
  • High temperature environments.
  • Used to improve chemical resistance to attack, abrasion and corrosion.
  • Performance-enhancing benefits such as corrosion protection, wear resistance, electrical insulation, electromagnetic shielding and chemical agent resistance.

Benefits of Dry Film Lubricants

The key factors for PTFE coatings are:

    • They are highly flexible
    • Very chemically resistant
    • Have excellent non-stick characteristics
    • Are electrically resistant
    • And offer a very low coefficient of friction, especially in lower load carrying applications

How do Dry or Solid Film Lubricants Work?

There are two main categories of dry film lubricants: crystalline lattice (lamella) type structures, including Molybdenum Disulfide, Tungsten Disulfide, and Graphite and Fluorocarbons, such as PTFE.

For crystalline type structures, such as Molybdenum Disulfide (MoS2) and Tungsten Disulfide (WS2), the shear forces between the layers are weak which results in increased lubricity between the sliding surfaces.

PTFE is a white, opaque synthetic fluoropolymer that provides lubrication in continuous use up to 260oC (500oF). The fluorocarbon molecule is structured such that the fluorine atoms surrounding the carbon atoms prevent any other atoms from getting near the carbon, preventing any further reaction. For this reason, PTFE is very unreactive which causes it to have a very low coefficient of friction and allows things to slide across its surface very easily.

Selecting the Correct Dry Film Lubricant

What properties are desiredWhat is the environment
Load carrying capacity Temperature
Low coefficient of friction High vacuum
Corrosion resistance Moisture / Humidity
Electrical properties Presence of oxygen
Radiation

Types of Dry Film Lubricants

propertiesMolybdenum DisulfideGraphitePTFE
Load carrying capacity >250 ksi <50 ksi <20 ksi
Coefficient of friction 0.04-0.08 0.04-0.10 0.02-0.04
Affect of moisture Negative Positive None
Electrical conductivity Not conductive Conductive Not conductive
Max operating temp in air 750F 1200F 500F
Operation in fluids /lubes Break-in only Break-in only Yes
Key strength High loads, operates in vacuum and cryogenic environments Moderate loads, high operating temp., electrically conductive Does not lubricate sacrificially, clean environments, coatings can be decorative

Where are Dry Film Lubricants Used?

Typical Applications

Fasteners: Torque/tension control, anti-galling, corrosion resistance
Couplings: Lubrication, anti-seize, chemical & corrosion resistance
Valves: Chemical & abrasion resistance, anti-seize
Pumps: Break-in lubrication, wear-life extension, chemical resistance
Gears: Close tolerance, precision gear lubrication, break-in lubrication
Bearings – Operation in vacuum or dirty environment, temperature extremes
Turbines: Turbine blade root sections and disk slots to aid in assembly, disassembly and reduces fretting and galling.
Firearms: Wear resistance, protection against corrosion, durability, lubricity, and decreased friction.

Typical Environments

Chemical and corrosion Delays or prevents corrosion
Abrasion resistance / reduced wear Withstands loads in excess of 250 ksi
Friction Reduces coefficient of friction
Lubrication Does not attract containments like “wet lubes”
No maintenance required
Water Based Coatings Lower VOCs, easy to apply
Temperature From -395ºF (-237ºC) to over 2000ºF (1093ºC)

Other Liquid Coatings

EMI/RFI Shielding

Smaller electronic components are particularly susceptible to damage or failure due to electrostatic discharge. To ensure the operational integrity of new, high-performance products, Evershield® is applied as a conductive coating and electroless plating processes for EMI/RFI shielding and semiconductive coating processes for electrostatic dissipation. EMI/RFI shielding blocks unwanted external and/or internal electromagnetic waves from emitting and interfering with other circuits or devices.

Benefits of Evershield EMI/RFI Shielding

  • Surface resistivity of 1 x 105 to 1 x 1012
  • Outstanding corrosion protection
  • Good lubricity on high-friction surfaces
  • Excellent wear resistance
  • High temperature and cryogenic stability

Typical Applications

  • Computers and Peripherals
  • Video Display Terminals
  • Medical Electronics
  • Telecommunication Devices
  • Automotive Electronics

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