HumiSeal® 1A33 LOF is a single component, polyurethane conformal coating, suitable for general printed circuit board applications. The formula of 1A33 LOF contains curing accelerants which significantly reduce curing times compared with other polyurethane coatings. High levels of chemical resistance and physical hardness can be achieved after 4 hours at 85˚C. HumiSeal® 1A33 LOF is specially formulated using reduced odour and low toxicity solvent, making it ideal for use in many situations. Similar to other Humiseal Polyurethane coatings, 1A33 LOF provides high levels of physical and chemical protection and is supplied in a convenient 1 part solvent system, which can be cured easily. After complete cure, the properties of HumiSeal® 1A33 LOF and other HumiSeal® 1A33 products are comparable.
| Product Specification | |
| Density, per ASTM D1475 | 0.90 ± 0.04 g/cm³ |
| Solids Content, % by weight per Fed-Std-141, Meth. 4044 | 44.5 ± 2.5 % |
| Viscosity, per Fed-Std-141, Meth. 4287 | 195 ± 65 centipoise |
| VOC | 488 grams/litre |
| Recommended Coating Thickness | 25 – 75 microns |
| Drying Time to Handle per Fed-Std-141, Meth. 4061 | 45 minutes at 25˚C |
| Recommended Thinner | Thinner 904, 600 |
| Recommended Stripper | HumiSeal® Stripper 1063 |
| Shelf Life at Room Temperature, DOM | 12 Months |
| Thermal Shock, 50 cycles per MIL-I-46058C | -65°C to125°C |
| Coefficient of Thermal Expansion – TMA | 193 ppm/°C |
| Glass Transition Temperature – DSC | 26°C |
| Modulus – DMA | 27.2 MPa |
| Flash point | 22.5˚C *estimated |
| Dielectric Withstand Voltage, per MIL-I-46058C | >1500 volts |
| Dielectric Breakdown Voltage, per ASTM D149 | 7500 volts |
