[Banned] Laser Material Approval Request: Krylon Colormaxx Flat Black Paint + Primer

[cory]

Hi! I want to cut/etch some painted wood. I found this previously approved “Flat Black Krylon Primer”:

Material approval request: flat black krylon primer for etching resist on copper

Hey, I have a colleague who is interested in using a laser to cut a design into a resist for copper etching. Something like this: https://www.youtube.com/watch?v=OTGZcY7WyYI only with FeCl, but that’s beside the point for this post. The MSDS for Krylon flat black primer https://www.krylon.com/document/SDS/en/US/724504016021 lists CO2, CO, and metal oxides as the decomposition products. The listed ingredients are all chlorine free. The metal oxides would be coming from the small amount of magne…

I went to a couple hardware stores but couldn’t find that exact product - the closest I found was this Krylon brand flat black paint + primer:

https://www.lowes.ca/product/spray-paint/krylon-colormaxx-flat-black-spray-paint-actual-net-contents-12-1689203

Since it’s not identical, I’d like to request the LCC have a look at this for approval. I found an SDS here: https://greggdistributors.ca/Paint-and-Paint-Supplies/all-paints/kry45546

Thanks, LCC!

[Majicj]

Hi Cory.

Thanks for submitting your request. The LCC will review it and get back to you.

A quick note that the above linked prior request was not approved as the application was for spraying copper sheets.

Another request that is similar and was approved is

Material Approval Request: Krylon Dual Superbond Paint + Primer Gloss Black (Laser etch on spray painted aluminum)

Hello y’all! I’m looking to get LCC approval to laser etch some sheet aluminum that has been spray painted with Krylon Dual Superbond Paint + Primer Gloss Black. Here is a link to the SDS for this particular product: Dual™ SUPERBOND™ Paint + Primer Gloss Black Many thanks! Mike.

[cory]

Thanks for looking into it! Much appreciated!

@Majicj

A quick note that the above linked prior request was not approved as the application was for spraying copper sheets.

I understood that thread to say that the paint itself was approved, but only for use on approved materials - i.e. not on copper. Apologies if that was a misreading. Either way, it’s a bit of a moot point since as far as I can tell that paint isn’t sold anywhere anymore!

[Majicj]

Hi Cory:

The LCC has reviewed your request and given our safety concerns we have decided that

Krylon Colormaxx Flat Black Paint + Primer is Banned for use in the VHS laser.

You should be able to find an alternate acrylic based spray paint that will work for your application.

Reasons for the ban are discussed below:

The Lowes site says that this paint is oil-based (i.e. not acrylic) and the MSDS states that this paint contains 19.02% Crystalline Silica, respirable powder by weight. This Crystalline Silica is known to be a human carcinogen.

The concern is that cutting and especially etching would release this Silica back into the laser cutter via smoke and also leave residue on the laser work piece.

A few comments from LCC

• ‘Crystalline silica is respirator territory’
• Silica dust is REALLY nasty stuff and is one of the causes of miners lung.