Condursal Stop Off Paints for the heat treating industry
33

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Condursal Stop Off Paints for the heat treating industry

CONDURON 33 Instructions For Use:

Application:
Prior to painting, the surfaces of the components to be protected must be cleaned thoroughly by either a vapor degreaser or a detergent washer, so that the parts are free of oil and grease. Also they must be free of rust and oxide layers. CONDURON 33 should be applied at normal room temperature. At temperatures +10°C it would thicken to an extent that it would not be paintable anymore. Before applying, stir the contents of the CONDURON 33 thoroughly. As received, CONDURON 33 is suitable for application by painting with a fine hair flat brush.

Two coatings of CONDURON 33 are required for optimum protection.
Apply a first coat of CONDURON 33 as evenly as possible to a thickness of approx. 0.2mm (.008"). The coating should be allowed to air dry thoroughly. After that, a second coating is applied in the same manner which must again be thoroughly dry before the parts are put into the furnace.

Total drying time which strongly depends on coating thickness, ambient and part temperature, atmospheric humidity etc. can range from approx. 3 to 8 hours. For effective protection it is important to have the coating thoroughly dried as mentioned above before heat treatment is started. This can be checked by "fingernail test". During use, with the can open, CONDURON 33 has a tendency to thicken due to evaporation of the liquid vehicle in the paint. Normal consistency can be restored by adding small amounts of "Special Thinner for CONDURON 33". Please note that overthinning would impair the effectiveness of the paint.

Removal of Residues after Heat Treatment:
After Carburizing and subsequent quenching, residues of CONDURON 33 can be removed by shotblasting or steelbrushing. They are not soluble in water or in solvents.

Cleaning of Equipment
As mentioned above, CONDURON 33 cannot be resolved or washed off after drying. So immediately after use, CONDURON 33 cans should be tightly resealed and the brushes cleaned with water. If painting is interrupted for any length of time, the brushes should be set in water to prevent drying of the bristles.

Storage
CONDURON 33 tins shall be stored in a dry cool place. Prevent from freezing.

CONDURON 33 Trouble Shooting:

 TROUBLE
  POSSIBLE REASONS
  HOW TO AVOID
Paint runs off during applying
 1. Workpieces have not been degreased thoroughly prior to coating
 Clean parts thoroughly by vapour degreasing or alkaline washing prior to applying the paint
2. Paint has not been stirred or has been thinned excessively
 Use paint as delivered but stir thoroughly prior to use; add small amounts of “Special Thinner� only if thickening has occurred due to evaporation of the liquid vehicle in the paint.
3. Paint has been applied in coatings of excessive thickness
 Apply paint in two coatings of uniform thickness; have the first one dried completely before applying the second one (fingernail test!)

Paint pops off after drying.
 1. Surfaces of workpieces have been wet, greasy or dusty when paint was applied
 Clean parts thoroughly by vapour degreasing or alkaline washing and make sure that they are dry prior to coating; remove dust after shotblasting
2. Surfaces were too smooth after fine turning or grinding
 Provide "rougher" surface

Paint pops off in the carburising furnace
 Paint has been applied in a too thick layer
 Apply the paint in 2 coatings of uniform thickness and let it dry thoroughly (fingernail test!) before the parts are put into the furnace

Protection against carbon pickup has been found to be non-uniform or non-satisfactory
 Total thickness of coating(s) applied has been not enough or non-uniform
 Apply the paint in two thin coatings of uniform thickness

Protection against carbon pickup has been found to be non-uniform or non-satisfactory
 Total thickness of coating(s) applied has been not enough or non-uniform
 Apply the paint in two thin coatings of uniform thickness

Pinhole-like carburising has occurred in the coated areas
 Only one coating has been applied
 Always apply two coatings of CONDURON 33

Insulation has occurred on non-coated areas
 Parts have been put too close together within the batch
 Avoid contact or too close settling of coated and non-coated parts within the batch

Poor carburising has been found on noncoated areas
 Furnace atmosphere has been affected by water vapor released during heating up of the coating
 Limit coated surface area to approx. 30% of the total surface of the batch (depending on the surface to weight ratio of the workpieces)

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