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LMM6904 Black for Raw and Anodized Aluminum

 

Recommended use:
LMM6904, a CerMark™ product, is a product for creating black marks on anodized aluminum. LMM6904 has been specially designed to create consistent marks on anodized surfaces despite the known variation in the quality of the anodization. In general, however, TherMark recommends LMM6018.LF tape for marking on anodized aluminum, as it creates a darker and more uniform mark than LMM6904.

ILMM6904 does not mark raw aluminum. We recommend LMM14 for marking raw aluminum.

LMM6904’s process window is quite narrow and it is a challenging product to use, we only recommend LMM6904 for existing users who do not wish to upgrade to LMM6018.LF or LMM14.


Recommended substrates:
LMM6904 can be used on anodized aluminum.


Anodized Aluminum

Lasers that work:
LMM6904 works well with CO2 and solid state lasers.

Dilution:
Liquid LMM6904 will need to be diluted differently depending on how you plan to apply it.

  • Air brush application: Ratio of 1:1 (1 part in volume of LMM6904, 1 part in volume of denatured alcohol) is recommended. Please refer to your air brush manual for information about material thickness for your model type.

  • Foam brush (hand) application: Ratio of 2:1 (2 parts in volume of LMM6904, 1 part in volume of denatured alcohol) is recommended.

For more information on dilution, click here.

Application methods:
Please make sure that the surface to be marked is free and clear of oils, cleaning agent films, dust, and lacquer coating.

  • Air brush application: When applying LMM6904 from an air brush, the resulting coating should be about 1.25 mil thick (~32 μm). Spray uniformly at a 10” distance from the surface and move the nozzle from one side to the other covering the whole substrate area. Start spraying away from the area to be marked and move towards the opposite side and past the target area. Over-spraying before and after the target area allows constant velocity of movement and will help provide an even coating on the substrate. Make sure the bare metal is not visible underneath. If necessary spray one or two more times. In general 1-2 strokes are enough to generate the desired coating. Good marks are produced with this product if the surface is covered with a medium heavy coat of LMM6904, especially on anodized surfaces.

  • Foam brush (hand) application: When hand applying LMM6904 the resulting coating of LMM6904 should be about 1.5 mils thick. Use about a 1” wide foam brush and soak less than ¼” of the brush with LMM6904. There is no need to soak more than that, otherwise the ink may splash and result in an uneven coat thickness. Apply with smooth, even strokes.

    Note: Air brush application is preferred over foam brush application. It can be challenging to achieve the smooth, even coating of laser marking material necessary for optimal marks when using a foam brush. We only recommend foam brush application if you do not have an air brush or are coating a small surface area.

For more information on application, click here.

Drying time & methods:
If left to air dry, LMM6904 is normally fully dry in just over a minute. If air drying takes too long, however, a hair drier or forced air heater may be used to speed up the process. LMM6904 can be fully dried with an average household hair dryer in less than 5 sec.

 

Laser settings:
Power and speed are the two most important variables to control when using TherMark laser marking materials with any laser, but there are other relevant variables depending on which laser you are using, such as length of lens, PPI, DPI, frequency, or hatch spacing. To read more detailed information on laser settings please click here, or follow the link below to download a recommended settings chart of
LMM6904 on various substrates.


LMM6904 Laser Settings Chart


Product Appearance:
LMM6904 is a black liquid with a viscosity of skim milk. It can settle upon standing and should be stirred prior to use.

Once applied to the substrate and dry, LMM6904 will be a black coating. It will be resistant to touching or accidental rubbing. However, it is water soluble and any contact with wet objects will smear the coating.

Shipping options:
LMM6904 products are not regulated for shipment by the by the US Department of Transportation (DOT). These products may be shipped via ground or air.

Product storage:
All LMM6904 products should be stored between 40ºF (5ºC) and 95ºF (35ºC) in a dark, dry place.

Disposal:
LMM6904 is a water-based material. After laser bonding, any excess, un-bonded material can be washed off the substrate and down the drain into your normal water/sewer waste area.



Downloads:
LMM6904 Data Sheet
LMM6904 Laser Settings Chart