NanoProof® 5.1

NanoProof® 5.1 is a hydrophobic/oleophobic acrylate based in fluorosolvent that rivals conformal coating like barrier properties. Read more to see if NanoProof® 5.1 is the solution for your waterproofing challenges!

Hydrophobic Droplets 2

NanoProof® 5.1 Features

Water Contact Angle: 120°

Oil Contact Angle: 76°

Conductivity: Push Through Connectivity® capability while drying only

Thickness: 6-9 µm thickness

PCB Immersion in Salt Water: >60 hours

Forgiving?: Yes, NanoProof® 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: Spray or Dip Applied

Dry Time:  10 minutes at room temperature.

Tech Comparison: More effective barrier than NanoProof® 4.0; designed for more technically challenging applications requiring a barrier like encapsulant.

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® 5.1 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® 5.1 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.

How To Apply NanoProof® 5.1

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

Spray – preferred method for 5.1

Apply Aculon® NanoProof® PCB Water Protection Encapsulants via spray gun. Aculon® NanoProof® PCB Water Protection Treatment comes in 1L Bottles for spray applications. Spray application typically results in treatment thickness of 50 nm – 20 µm depending on process parameters and chemistry selected.

Recommended Equipment:


Dip – optional method for 5.1

Fully immerse the part in the Aculon® NanoProof® PCB Water Protection Treatment solution for 30 seconds. Withdraw the part at a steady rate to ensure even coverage. Allow to dry or cure depending on your substrate. Aculon® NanoProof® PCB Water Protection Treatments come in convenient 1L quantities for dipping applications.


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!



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® 5.1 : Fluorosolvents (Aculon® FS-500)


Plastic Part Compatibility

Please refer to these general guidelines to determine if the NanoProof® product you are working with is compatible with your plastic parts that will come into NanoProof® in your manual or automated systems(tubing, pumps, gaskets, etc). Please note these are general guidelines for compatibility and it is recommended you test to confirm prior to implementation as Aculon® can not guarantee compatibility with your specific part.

NanoProof® 5.0 & 5.1

  • Compatible: PTFE, PET, Viton


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® 5.0 & 5.1

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.


What is the typical oil contact angle for Nanoproof® 5.1?
ANSWER: About 78° – typically in the high 70°’s. As a point of reference: An untreated product, depending on the substrate, would fall somewhere in the 10°-20° degree range.

Which application process is better?  Dispensing, manual spray, or dipping?
ANSWER: In general, spray is often preferred for application of 5.0 & 5.1 but it comes down to testing and what you need in the areas that are going to cause the most problems on your specific part.

Do connections or solderable surfaces need to be masked for the application of Nanoproof® 5.0 or 5.1?
ANSWER: NanoProof® 5.0, 5.1, & 7.0 have a limited window for making electrical connections, generally around an hour or so after application. Once NanoProof® 5.0, 5.1, & 7.0 have set, it is possible to use a bit of fluorosolvent (available through Aculon® , please call 858-350-9474) around the specific area to allow for push through connectivity.

Can you dip coat unsealed switches?
ANSWER: Yes, with NanoProof® 1, 3.5, 4.0, there is no problem with this. With NanoProof® 5.0, 5.1, 7.0, & 8.4 – though it has not been tested, it most likely would not work due to its more rigid structure once it has set.

What are the Carrier Solvents?
ANSWER: For NanoProof® 5.0 & 5.1 the carrier is a fluorosolvent blend.

Do we have measured viscosities of the various treatments?
ANSWER: For NanoProof® 5.1 – it depends on the application formulation selected. It is fairly light in viscocity in the 1-10 centipoise range.

Are there disadvantages for a surface that has been over-applied or applied to be too thick?
ANSWER: No, only thing to be impacted would be the push-thru connectivity with a treatment that is too thick. For NanoProof® 5.1, two treatment layers may impede push-thru if you spray it, let it dry and spray again. This may prevent you from being able to do a push-pin connection.

Does teh applied thickness impact conductivity?
ANSWER: Our NanoProof® films themselves are not conductive. NanoProof® 5.0, 5.1, & 7.0 is a firmer barrier – you will need to peel off or use a fluorosolvent to re-wet the area if you want to go through it.

Do these products have low boiling points?
ANSWER: For NanoProof® 5.1, it would depend on which application you choose, dip, spray or dispense. The solvent range boiling point is 85 – 140°C.

Can a regular test tape be used to test for adhesion?
ANSWER: NanoProof® 5.0 & 5.1 cure 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 something very simple for humidity – go with something straightforward like NanoProof® 1.0. 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. NanoProof® 3.5, 4.0, 5.0, & 5.1 fit somewhere in the middle performance wise and are usually robust enough to meet most performance specs.