UV Curable (Type AR/UR) > UV40-250
HumiSeal® UV40-250 is a single component, high solids, UV curable, acrylated polyurethane conformal coating that possesses excellent chemical resistance, surface hardness, flexibility and moisture resistance. The material is tack-free after exposure to UV light. A secondary moisture cure mechanism will cure unexposed areas of the coating within 2-3 days at ambient conditions. The coating fluoresces under UV light to allow for coating inspection and can be applied by all selective coating equipment. HumiSeal® UV40-250 is IPC-CC-830 and RoHS Directive 2002/95/EC compliant.
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.
Spraying
HumiSeal® UV40-250 can be applied via standard selective coating. The source air used for spraying must be dry (a dry inert gas is highly recommended) to prevent premature curing by the secondary cure mechanism. The spraying should be done with adequate ventilation so that the vapour and mist are carried away from the operator.
Clean Up
To flush equipment and clean uncured HumiSeal® UV40-250, non-alcohol based solvents should be used. HumiSeal® Thinner 600 is recommended.
Rework
HumiSeal® UV40-250 is a highly cross linked UV cured coating. The cured film has a high degree of environmental and chemical resistance and will be more difficult to remove than traditional conformal coatings. Thermal displacement and mechanical abrasion are suitable options for rework of HumiSeal® UV40-250.
Product Specification
| Product Specification | |
| Density | 1.06 g/cm3 |
| Minimum Solids Content | 95 % |
| Viscosity, per Fed-Std-141, Meth. 4287 | 300 ± 50 centipoise |
| Recommended Coating Thickness | 25 - 125 microns |
| Recommended UV Dose* | 1-5 J/cm2 |
| Shelf Life at Room Temperature, DOM | 6 months |
| Thermal Shock, 500 cycles per MIL-I-46058C | -65°C to 125°C |
| Glass Transition Temperature - DSC | 26°C |
| Coefficient of Thermal Expansion | 112 ppm/°C Below Tg 283 ppm/°C Above Tg |
| Modulus - DMA | 1060 MPa -60°C |
| Flammability, per UL-94 | V-0 |
| Dielectric Withstand Voltage, per MIL-I-46058C | >1500 volts |
| Dielectric Constant, at 1MHz and 25°C per ASTM D150-98 | 2.41 |
| Dissipation Factor, at 1MHz and 25°C per ASTM D150-98 | 0.01 |
| Insulation Resistance, per MIL-I-46058C | 8.0 x 1014 ohms (800TΩ) |
| Moisture Insulation Resistance, per MIL-I-46058C | 4.7 x 1010 ohms (47GΩ) |
| Fungus Resistance, per ASTM G21 | Pass |
| Resistance to Chemicals | Excellent |
*Fusion “H” style bulb recommended
Downloads
Datasheets
UV40-250 TDS (.pdf)
UV40-250 TDS - Portuguese (Brazilian) (.pdf)
UV40-250 TDS - Spanish (.pdf)
MSDS
UV40-250 MSDS - English (.pdf)
UV40-250 MSDS - French (.pdf)
UV40-250 MSDS - German (.pdf)
UV40-250 MSDS - Italian (.pdf)
UV40-250 MSDS - USA (.pdf)
REACH
REACH Statement (.pdf)
RoHS
RoHS - UV Curable (.pdf)
Conformal Coating Standards
Disclaimer
All values contained herein are typical values.
Please consult the Technical Data Sheet for the specific product to obtain complete information and detailed specification ranges and physical properties
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