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Ron55
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Join Date: Mar 2008
Posts: 17

Solvent Resistant Coatings for Nylon Part

12/08/2020 3:36 PM

I have a 3D printed part in Nylon 12 to be used in hot 90C solvent e.g. Xylene

It softens with long term exposure i.e. 12 hours and can readily snap when bent by hand.

Can anyone recommend a paint or coating I can apply that will afford long term protection of the part in this environment.
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Pathfinder Tags: coatings Solvent resistance
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HiTekRedNek
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#1

Re: Solvent Resistant Coatings for Nylon Part

12/08/2020 5:54 PM

Not much can resist Xylene,esp at elevated temps.

Here is a list that may help you decide:https://omnexus.specialchem.com/polymer-properties/chemical-resistance/xylene-20-c

You may want to choose a different raw stock for printing.

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SolarEagle
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#2

Re: Solvent Resistant Coatings for Nylon Part

12/08/2020 6:30 PM

https://versaflex.com/chemical-acid-solvent-resistant-coatings/

https://versaflex.com/products/chemical-resistant/lc-25-extreme-chemical-exposure-lock-coat/

https://www.calpaclab.com/viton-chemical-compatibility-chart/

I think I might try a metal coating...

https://www.satplating.com/plating-plastics/

https://www.sharrettsplating.com/blog/plating-engineering-grade-plastics/

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SolarEagle
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#6
In reply to #2

Re: Solvent Resistant Coatings for Nylon Part

12/10/2020 5:01 AM

Maybe go with nylon 66...

https://www.ptonline.com/products/two-high-temperature-resistant-grades-of-nylon-66-debut

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lyn
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#3

Re: Solvent Resistant Coatings for Nylon Part

12/08/2020 11:38 PM

You are doomed to fail with this thermoplastic. Heat degradation will cause the part to fail, and Xylene is the kiss of death. Please find a better material. Any coating will NOT help.

Standard Nylon 12

PropertyValue
Density1.01 g/cm³
Surface HardnessRR105
Tensile Strength7251.89 psi (50 MPa)
Flexural Modulus1.4 GPa
Notched Izod0.06 kJ/m
Elongation at Break200%
Strain at Yield6%
Maximum Operating Temp.

158°F (70°C)

Water Absorption0.25%
Oxygen Index21%
UL 94 Flammability RatingV2
Dielectric Strength60 MV/m
Heat Distortion Temperature @ 0.45 MPa302°F (150°C)
Heat Distortion Temperature @ 1.80 MPa131°F (55°C)
Material Drying2 hours @ 194°F (90°C)
Melting Temperature Range374°F - 410°F (190°C - 210°C)
Mold Shrinkage1.5%
Mold Temperature Range104°F - 140°F (40°C - 60°C)
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PWSlack
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#4

Re: Solvent Resistant Coatings for Nylon Part

12/09/2020 2:28 AM

<...hot 90C...Xylene...> is an effective paint stripper.

At those temperatures it is above its flash point. Please make sure all other CR4 readers are out of the building during this operation.

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Ron55
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#10
In reply to #4

Re: Solvent Resistant Coatings for Nylon Part

12/23/2020 11:17 AM

Thanks for your concern. The application is in a controlled vented fume hood laboratory environment. No personnel are exposed to Xylene vapour.
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mikey
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#11
In reply to #10

Re: Solvent Resistant Coatings for Nylon Part

12/23/2020 3:19 PM

Have you considered printing a part with a polymer that has excellent compatibility with xylene, such as PEEK (poly ether ester ketone)?

Compatibility chart from Cole-Parmer: https://www.coleparmer.com/chemical-resistance

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Nigh
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#5

Re: Solvent Resistant Coatings for Nylon Part

12/09/2020 10:31 AM

Parylene claims to resist Xylene up to 150°C.

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JE in Chicago
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#7

Re: Solvent Resistant Coatings for Nylon Part

12/10/2020 7:36 AM

You can have the part printed in metal for a price... of course

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Brave Sir Robin
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#8
In reply to #7

Re: Solvent Resistant Coatings for Nylon Part

12/10/2020 1:00 PM

If they only need a small quantity, it is probably much cheaper in the long run.
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JE in Chicago
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#9

Re: Solvent Resistant Coatings for Nylon Part

12/17/2020 7:56 AM

A Carbon 3D resin printer can also be hired to print a few in production grade materials. that may be compatible.

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Users who posted comments:

Brave Sir Robin (1); HiTekRedNek (1); JE in Chicago (2); lyn (1); mikey (1); Nigh (1); PWSlack (1); Ron55 (1); SolarEagle (2)

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