Urethane 1A67

HumiSeal® 1A67 Urethane Conformal Coating

HumiSeal® 1A67 is a single component, polyester urethane conformal coating intended for the protection of general printed circuit assemblies. HumiSeal® 1A67 is a toluene-free coating with low gas permeability. HumiSeal® 1A67 demonstrates excellent flexibility and long term electrical properties and is RoHS Directive 2002/95/EC compliant.

Properties of HumiSeal® 1A67


Density, per ASTM D1475


Solids Content, % by weight per Fed-Std-141, Meth. 4044 30 %
Viscosity, per Fed-Std-141, Meth. 4287 750 +/- 350 centipoise
VOC 644 grams/litre
Drying Time to Handle per Fed-Std-141, Meth. 4061  25 minutes
Recommended Coating Thickness 25 – 75 microns
Recommended Curing Conditions 20 hrs @ 80°C
Time Required to Reach Optimum Properties 7 days
Recommended Thinner HumiSeal® Thinner 600
Recommended Stripper HumiSeal® Stripper 1063
Glass Transition Temperature DSC 55°C
Shelf Life at Room Temperature, DOM 12 months
Dielectric Withstand Voltage, per MIL-I-46058C >1500 volts
Insulation Resistance, per MIL-I-46058C 6.93 x 1012 ohms (6.93 TΩ)
Moisture Insulation Resistance, per MIL-I-46058C 6.9 x 1010 ohms (69 GΩ)

Application of HumiSeal® 1A67

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, 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.


HumiSeal® 1A67 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 HumiSeal® Thinner 600 is necessary to ensure a uniform spray pattern resulting in pinhole-free film. The amount of thinner and spray pressure will depend on the specific type of spray equipment used and operator technique.


HumiSeal® 1A67 may be brushed with a small addition of HumiSeal® Thinner 600. Uniformity of the film depends on component density and operator’s technique.


HumiSeal® 1A67 should be stored away from excessive heat or cold, in tightly closed containers. HumiSeal® products may be stored at temperatures of 0 to 35°C. Prior to use, allow the product to equilibrate for 24 hours at a room temperature of 18 to 32°C.


Application of HumiSeal® Conformal Coatings should be carried out in accordance with local and National Health and Safety regulations.

The solvents in HumiSeal® Conformal Coatings are flammable. Material should not be used in presence of open flame or sparks. 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.

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