STOP-OFF PAINT FOR:
NITRIDING

  • Properties

    Precisely limited insulation areas are easily achieved with CONDURSAL N623p by painting. If applied properly, the CONDURSAL N623p coating does not creep or run off and there is no interference or “radiation” to non-coated work pieces.

    Drying time for CONDURSAL N623p normally ranges between 1 and three hours, depending on temperature and atmosphere humidity. Thinning of the paint, which can be necessary if it has become slightly thicker in the course of time due to evaporation, can be achieved using small amounts of water. Avoid over thinning; it would impair adhesiveness as well as the protective effect of CONDURSAL N623p. To prevent thickening of the paint, the tins should be closed hermetically after use.

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  • Condursal N623p

    CONDURSAL N623p is a newly developed water base stop-off paint providing excellent protection against pick-up of nitrogen during gas Nitriding processes up to 90 hours at temperatures ranging normally between 900° F and 1100° F. CONDURSAL N623p is practically free of solvents, which is an important feature with respect to health and safety regulations.

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Instructions

CONDURSAL N623p Instructions For Use:
The areas to be coated with Condursal N623p must be clean, Le. free of dust, rust, oil and grease. This is normally achieved by either washing with alkaline, by vapor degreasing with chlorinated solvents or by shot blasting.

Before applying Condursal N623p paint, stir the contents of the tin thoroughly which is also recommended from time to time during use because some of its ingredients, being of high specific weight, tend to settle at the bottom of the tin. To apply the paste by painting, use flat clean brushes with soft bristles and make sure to get a coating of uniform thickness (.008-.012").

Normally one coating is sufficient for effective insulation. Only in the case of critically shaped areas as threads, edges or sharp radii, a second coating transverse to the edges is recommended. For optimum insulation it is necessary to make sure the coating has been drying thoroughly before the parts are put into the furnace.

Drying time for Condursal N623p normally ranges between 1 and three hours, depending on temperature and atmosphere humidity. Thinning of the paint, which can be necessary if it has become slightly thicker in the course of time due to evaporation, can be achieved using small amounts of water. Avoid over thinning; it would impair adhesiveness as well as the protective effect of Condursal N623p. To prevent thickening ofthe paint, the tins should be closed hermetically after use.

Special Notes:
Coated areas of the work pieces should not exceed 30% of the total surface of the batch to be nitrided because otherwise the Nitriding atmosphere might be affected.
Residues of Condursal N623p are of a powdery appearance after the nitriding process. So, because of the gas turbulence in the furnace, some of them occasionally are getting off from the surface of the components and are left as a deposit in the retoJ,i. Since this might lead to soft spots on the non-coated areas of nitrided work pieces later on, it is recommended to remove the powder (which is easy to detect because of it's green color) from the retort after every mtriding cycle using a vacuum cleaner.

Removal of Residues:
After Nitriding, the residues of Condursal N623p can be removed using a steel brush or by sandblasting.

Cleaning of brushes and other equipment:
To clean brushes or other equipment, which have come into contact with the paint, tap water can be used, provided the paint residues are still wet. Other wise solvents such as Trichlorethylene are necessary to soften and remove the paint.

Storage:
Condursal N623p should be stored in a dry cool place.

SDS