NanoProof® 8.4

NanoProof® 8.4 is a hydrophobic polyolefin encapsulant based in methylcyclohexane. NanoProof® 8.4 is designed for extreme level protection/barrier properties so read more to learn if this product is the solution for your waterproofing challenges!

NanoProof® 8.4 Features

Water Contact Angle: 115°

Conductivity: Push Through Connectivity® capability

Thickness: 50-100 µm thickness

PCB Immersion in Salt Water: >60 hours

Forgiving?: Yes, NanoProof® 8.4 is more forgiving during application.

IPX7: i.e. 30 minutes immersion at 1 meters: Pass

Includes UV Tracer?: Yes.

Cure Required?: No, NanoProof® does not require a cure.

ROHS & REACH compliant?: Yes.

Application Method: Film Coat or Dispense

Dry Time:  30 minutes at room temperature.

Tech Comparison: More effective barrier than NanoProof® 5.0 and 5.1; designed for applications requiring extreme levels of protection.

Economical price point.

Abrasion Resistance

While Aculon® NanoProof® PCB Water Protection Treatment can be handled after treatment during assembly, it is not meant for long term abrasion exposure and durability that would be experienced by a permanently exposed PCB.

Temperature Resistance

Aculon® NanoProof® PCB Water Protection Treatment is stable to 250C before the chemical structure is damaged and performance impacted. There is no known lower temperature threshold which damages the treatment.

Chemical Compatibility

Aqueous Solvents

NanoProof® 8.4 is confirmed compatible with Aqueous solvents of pH 6.5-8.5. More extreme acids and bases have not been tested to confirm impacts but it is not expected that aqueous solvents between PH of 2-10 should be problematic for the NanoProof® encapsulants.

Organic Solvents

NanoProof® 8.4 is not compatible with petroleum based solvents, as they will be dissolved and removed. As such, petroleum based solvents can be used to remove these specific NanoProof® for rework.

NanoProof® 8.4 is not compatible with fluorosolvents. As such, fluorosolvents can be used to remove these specific NanoProof® for rework.

How To Apply NanoProof® 8.4

Step 1: Clean

Parts must be sufficiently clean prior to treatment for proper bonding and effective application. See “Cleaning” tab for more detail.

Step 2: Treat

Jet Treat – preferred method for 8.4

Film Treat – preferred method for 8.4

Dispense – optional method for 8.4

Utilization of Multiple Options

Please note that many customers have found significant success utilizing two or more of the available NanoProof® technologies successfully. Often times, the most sensitive components benefit from the most robust NanoProof® technology (5.1, 7.0, or 8.4) while the remaining components can be coated with the less robust treatments to benefit from their electrical push through capability, flexible nature and lower costs!

Warning: Dip – not recommended for 8.4



All NanoProof® products contain a UV Tracer which is visible under 365nm wavelength UV light (Detectable by both the human eye and automated detection systems). Please note that soldermasks and other substrate materials containing a UV tracer may make accurate detection of NanoProof® difficult.


Removal Solvents for Rework

Aculon recommends the below solvents for removal of NanoProof® from your board should rework be necessary.
NanoProof® 8.4: Fluorosolvents (Aculon® FS-500)


Masking Tape Compatibility

Please refer to these general guidelines to determine if the NanoProof® product you are working with to determine masking tapes that are compatible.

NanoProof® 8.4: Compatible: Expect all masks to be compatible. Suggested masks:

A properly cleaned and prepared surface is imperative for Aculon® NanoProof® PCB Water Protection Treatment to properly bond with the surface and offer desired performance. The level of cleanliness can play a role in performance and durability/lifetime of the treatment. Cleaning Methods can be summarized into Good, Better, & Best Options. The below cleaning options assume that the part to be treated has been sufficiently degreased and cleaned of all visual contaminants first.


  • Blow the part clean with oil free compressed air
  • Rinse with IPA or other appropriate cleaning solvent


  • Use an appropriate Kyzen cleaner


  • clean room construction and a combination of the above


Have a high volume or complicated process and are not sure what level of cleaning your parts require? Contact Aculon® and we will work with you to determine the level of cleanliness needed for your application and to determine a cleaning method that fits your process.


Which application process is better?  Dispensing, manual spray, or dipping?
ANSWER: This depends on the process you use and the part you need coated. It comes down to testing and what you need in the areas that are going to cause the most problems on your specific part.  Keep in mind, 8.4 cannot be applied via spray due to its thick nature. 8.4 must be applied via dip or film coat.

Do connections or solderable surfaces need to be masked for the application of Nanoproof® 8.4?
ANSWER: No masking is typically required for application of NanoProof® 8.4. These materials are designed around having a Push Through Connectivity® at all the times. Even days or weeks later – you can still push through.

Can you dip coat unsealed switches?
ANSWER: With NanoProof® 8.4 – though it has not been tested, it most likely would not work due to its more rigid structure once it has set.

Do we have measured viscosities of the various treatments?
ANSWER: For NanoProof® 8.4, the viscosity is higher than 20 centipoise.

Does the applied thickness impact conductivity?
ANSWER: Our NanoProof® films themselves are not conductive. NanoProof® 1.0, 2.0, 3.5, 4 .0 & 8.4 will be able to push through (allowing electrical connections to be made) with no impact to conductivity.

Can a regular test tape be used to test for adhesion?
ANSWER: NanoProof® 8.4 cures into a hard treatment. So yes, once cured, a tape test can be utilized to test for adhesion.

How do you suggest I test if a waterproof encapsulant is needed for my part? Also, how do I determine which NanoProof® meets my performance needs?

ANSWER: From working with our customers, we see that there is a huge variety of testing: we have manufacturers of medical devices that are worried about splashing of liquid on their device, other who need IPX7 qualification or others who require even longer periods of submersion in a variety of solutions.

Determine the level of exposure and performance you want the part to pass– connect the device (board), turn the power on the unit and test against those conditions.

If you want full submersion of a running device over a long period of time NanoProof 7.0 OR 8.4 is likely most appropriate.