Urethane Conformal Coating - High Viscosity Adaptability With Humiseal Thinners | Unmatched Uniform Film Application, Moisture And Contaminant Resistance

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Cleanliness of the substrate is of extreme importance for the successful application of a conformal coating. Surfaces must be free of moisture, dirt, wax, grease, flux residues and all other contaminants. Contamination under the coating could cause problems that may lead to assembly failures.
Dipping:

Depending on the complexity, density and configuration of components on the assembly, it may be necessary to reduce the viscosity of HumiSealAR 1A33 with HumiSealAR Thinner 503 in order to obtain a uniform film. Once optimum viscosity is determined, a controlled rate of immersion and withdrawal (5-15 cm/min) will further ensure even deposition of the coating and ultimately a uniform film. During the application, evaporation of solvent causes an increase in viscosity that should be adjusted by adding small amounts of HumiSealAR Thinner 503. Viscosity in the dip tank should be checked regularly, using a simple measuring device such as a Zahn or Ford viscosity cup.
Spraying:

HumiSealAR 1A33 can be sprayed using conventional spraying equipment. Spraying should be done in an environment with adequate ventilation so that the vapour and mist are carried away from the operator. The addition of HumiSealAR Thinner 521 or 521EU is necessary to ensure a uniform spray pattern resulting in pin hole free film.