Knowde Enhanced TDS
Identification & Functionality
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Features & Benefits
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Applications & Uses
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- Application Area
- Application Method
- Coating Type
- Application
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 HumiSeal® 1A33 with HumiSeal® 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 HumiSeal® 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
HumiSeal® 1A33 can be sprayed using conventional spraying equipment. Spraying should be done in an environment with adequate ventilation so that the vapor and mist are carried away from the operator. The addition of HumiSeal® Thinner 521 or 521EU 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. The recommended ratio of HumiSeal® 1A33 to HumiSeal® Thinner 521 or 521EU is 4:1 by volume; however the ratio may need to be adjusted to obtain a uniform coating.
Brushing
HumiSeal® 1A33 may be applied by brush. Uniformity of the film depends on component density and operator's technique.
Properties
- Typical Properties
| Value | Units | Test Method / Conditions | |
| Density | 0.95 ± 0.02 | g/cm³ | ASTM D1475 |
| Solids Content ( % by weight per Fed-Std-141, Meth. 4044) | 44 ± 2 | % | - |
| Viscosity (per Fed-Std-141, Meth 4287) | 180 ± 20 | centipoise | - |
| VOC | 531.0 | grams/litre | - |
| Recommended Coating Thickness | 25 - 75 | microns | - |
| Drying Time to Handle (per Fed-Std-141, Meth. 4061) | 15.0 | minutes | - |
| Optional Curing Conditions to Reach Optimum Properties (RT) | 30.0 | days | - |
| Optional Curing Conditions to Reach Optimum Properties (76°C) | 30.0 | hours | - |
| Optional Curing Conditions to Reach Optimum Properties (88°C) | 20.0 | hours | - |
| Recommended Thinner (dipping, brushing) | HumiSeal® Thinner 503 | - | - |
| Recommended Thinner (spraying) | HumiSeal® Thinner 521, 521EU, 600 | - | - |
| Recommended Stripper | HumiSeal® Stripper 1063 | - | - |
| Thermal Shock ( 50 cycles per MIL-I-46058C) | -65 - 125 | °C | - |
| Coefficient of Thermal Expansion - TMA | 193.0 | ppm/°C | - |
| Glass Transition Temperature - DSC | 26.0 | °C | - |
| Modulus - DMA | 27.2 | MPa | - |
| Dielectric Withstand Voltage ( MIL-I-46058C) | min. 1500 | volts | - |
| Dielectric Breakdown Voltage | 7500.0 | volts | ASTM D149 |
| Dielectric Constant ( 1MHz and 25°C ) | 3.6 | - | ASTM D150-98 |
| Dissipation Factor ( 1MHz and 25°C ) | 0.03 | ASTM D150-98 | - |
| Insulation Resistance (per MIL-I-46058C ) | 2.0 x 1014 (200TΩ) | ohms | - |
| Moisture Insulation Resistance, per MIL-I-46058C | 1.6 x 1010 (16GΩ) | ohms | - |
| CTI, PLC per UL746E ( 600 volts) | 0.0 | - | - |
| Fungus Resistance | Passes | ASTM G21 | - |
Regulatory & Compliance
- Certifications & Compliance
Safety & Health
- Caution
Application of HumiSeal Conformal Coatings should be carried out in accordance with local and National Health and Safety regulations.
The solvents in HumiSeal® 1A33 are flammable. Material should not be used in presence of open flame or sparks. Use only in well-ventilated areas to avoid inhalation of vapors or spray. Avoid contact with skin and eyes.
Storage & Handling
- Storage
HumiSeal® 1A33 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.
- Shelf Life at Room Temperature, DOM
24 months