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 |
0.92g/cm³ |
| 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.
Spraying
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.
Brushing
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.
Storage
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.
Caution
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.
