HumiSeal® 1H2OAR3/D is a water-based acrylic conformal coating, suitable for most dip application methods. The coating contains a UV tracer for ease of inspection. HumiSeal® 1H2OAR3/D provides excellent moisture insulation resistance and can be chemically removed or soldered through for rework. HumiSeal® 1H2OAR3/D coating is RoHS Directive EU 2002/95/EC compliant.
Application
  Cleanliness of the substrate is extremely important to the successful application of a conformal coating. Surfaces should be free of moisture, dirt, wax, grease and all other contaminants. Otherwise, ionic or organic residues on the substrate could be trapped under the coating and cause problems with adhesion or electrical properties. The highest long term reliability for a coated printed circuit assembly will be when the conformal coating is applied over a clean, dry substrate.
  The application of conformal coatings over no clean flux is a common practice. The user should perform adequate testing to confirm compatibility between the conformal coating and their particular assembly materials and process conditions. Please contact HumiSeal for additional information.
  Waterborne coatings should not be placed directly on bare/untreated steel. Applying waterborne coatings when the Relative Humidity is > 80% will adversely affect coating uniformity and can cause poor adhesion.
  When HumiSeal® 1H2OAR3/D is first applied it has a milky white appearance. As the film dries, the white color fades until a clear, transparent film remains. The white color aids the operator’s coverage inspection and the color change serves as an indicator that the coating is dry to the touch. It is recommended that the coating be allowed to reach a tack-free condition before using heat to accelerate the cure process.
Dipping
  The material has been formulated for dip application as supplied and requires no thinning. Thinning will reduce the application performance and increase curing time substantially and is not recommended. Because it is a water based coating, evaporation of HumiSeal® 1H2OAR3/D from the dip tank is very low. However, over a long period of time, the addition of a small amount of fresh HumiSeal® 1H2OAR3/S is beneficial, to replace the low level of coalescing solvents that are lost along with some water. The coalescing solvents are essential to provide optimum film formation and the other physical and electrical properties of the resin.
  A slightly slower immersion speed is recommended to reduce the possibility of air entrapment under the components. The withdrawal speed depends on the complexity of the assembly being coated. Although the material has been formulated to lay down 1.5 mils in a single dip application, for densely populated assemblies, reducing the withdrawal speed or applying two successive thinner coatings will give better edge coverage and a better coating appearance.
Storage
  HumiSeal® 1H2OAR3/D should be stored in its original container in cool, dry conditions. Avoid freezing, since this will compromise performance of the product.
Caution
  Application of HumiSeal® Conformal Coatings should be carried out in accordance with local and National Health and Safety regulations.
  Use only in well-ventilated areas to avoid inhalation of vapours or spray. Avoid contact with skin and eyes.
  Consult MSDS/SDS prior to use.