No, WD-40 is not recommended for lubing mechanical keyboard switches. It's a water displacing solvent, not a true lubricant, and can damage switch components. Specialized switch lubricants like Krytox or TriboSys are better suited for this purpose.
Here's why WD-40 is not ideal:

Not a true lubricant:
WD-40 is primarily designed to displace water and clean, not to provide long-lasting lubrication.

Can damage plastic:
It can potentially degrade or damage plastic components within the switches.

Attracts dust and debris:
WD-40 can leave a sticky residue that attracts dust and dirt, potentially causing further issues.

Not designed for mechanical keyboards:
It's formulated for different applications and may not offer the desired lubrication properties for mechanical keyboards.

Instead, use lubricants specifically designed for mechanical keyboards, such as:

Krytox: A popular choice for linear switches, known for its smooth and durable lubrication.
TriboSys: Another good option, with different variants like 3204 and 3203 offering different viscosities.
Dielectric grease: Can be used for stabilizers to reduce rattle.

PFPE, or Perfluoropolyether, is a type of synthetic liquid lubricant known for its exceptional chemical inertness, high thermal stability, and wide operating temperature range. It's used in various demanding applications, including aerospace, vacuum technology, and automotive industries, where resistance to harsh chemicals and extreme temperatures is crucial.

Key Properties and Characteristics:

Chemical Inertness: PFPEs are highly resistant to a wide range of chemicals, including acids, bases, and solvents.
High Thermal Stability: They can withstand extremely high temperatures, often exceeding 300°C (572°F).
Wide Temperature Range: PFPEs can remain liquid and functional at very low temperatures, often down to -70°C (-94°F).
Low Toxicity: Generally considered non-toxic and safe for use in various applications.
Excellent Compatibility: PFPEs are compatible with many plastics and elastomers, making them versatile for different systems.
Low Evaporation Rate: This reduces the need for frequent re-lubrication in sealed systems.
Non-Flammable: PFPEs are non-flammable, enhancing safety in various environments.
Long-chain polymer structure: This structure provides the base for the exceptional properties of PFPEs.

Common Applications:

Aerospace Industry: Used in lubrication of components in extreme conditions.
Vacuum Technology: Ideal for vacuum pumps and other equipment requiring low outgassing and high vacuum performance.
Automotive Industry: Lubricating various components, including those in harsh chemical environments.
Dry Etching Systems: Used in the semiconductor industry for lubrication in these systems.
Magnetic Recording Media: Used in the lubrication of magnetic storage devices.
Nuclear Technology: Used in applications where radiation resistance is important.
Personal Fall Protection Equipment (PFPE): In some contexts, PFPE can refer to Personal Fall Protection Equipment.

PFPE Degradation:
While generally stable, PFPEs can degrade under specific conditions:

Lewis acid catalysis: PFPEs are susceptible to decomposition when exposed to Lewis acids.
Thermal decomposition: Excessive heat can break down the polymer chains.
Catalytic decomposition: Some catalysts can accelerate the degradation process.
Mechanical scission: Physical stress can also lead to breakdown.
Triboelectric decomposition: Friction can also be a factor in some cases.

Environmental Considerations:
PFPEs have been detected in the environment, and their transformation and degradation are still being studied. Research is ongoing to better understand the life cycle of PFPEs and their potential environmental impact.

In summary, PFPE is a highly specialized lubricant known for its extreme properties, making it suitable for a wide range of demanding applications, especially where conventional lubricants fail.