Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Product Type
- Technologies
- Product Families
Features & Benefits
- Ready-to-Use Product Features
Applications & Uses
- Markets
- 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, 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
Although its formulation allows HumiSeal® 1A20R to be applied using a wide variety of methods, care should be taken to ensure that it is only applied in an environment where the ambient relative humidity is at 60% or less. Application of the coating when the RH is higher than 60% can cause acceleration of the cure reaction, resulting in bubbles in the dried film.
Dipping
Depending on the complexity, density and configuration of components on the assembly, it may be necessary to reduce the viscosity of HumiSeal® 1A20R with HumiSeal® Thinner 521 or 521EU 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 521 or 521EU. Viscosity in the dip tank should be checked regularly, using a simple measuring device such as a Zahn or Ford viscosity cup.
Spraying
HumiSeal® 1A20R 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 pinholefree 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® 1A20R to HumiSeal® Thinner 521 or 521 EU is 5:2 by volume; however the ratio may need to be adjusted to obtain a uniform coating.Brushing
HumiSeal® 1A20R may be brushed with a small addition of HumiSeal® Thinner 521 or 521EU. Uniformity of the film depends on component density and operator's technique.
Properties
- Typical Properties
| Value | Units | Test Method / Conditions | |
| Density | 1.02 ± 0.02 | g/cm³ | ASTM D1475 |
| Solids Content ( % by weight per Fed-Std-141, Meth. 4044) | 50 ± 3 | % | - |
| Viscosity (per Fed-Std-141, Meth 4287) | 100 ± 30 | centipoise | - |
| VOC | 511.0 | grams/litre | - |
| Recommended Coating Thickness | 25 - 75 | microns | - |
| Drying Time to Handle (per Fed-Std-141, Meth. 4061) | 60.0 | minutes | - |
| Recommended Curing Conditions | 24 hrs @ RT or 3 hrs @ 76°C | - | - |
| Time Required to Reach Optimum Properties | 7.0 | days | - |
| Thinner, if needed (dipping, brushing, spraying) | HumiSeal® Thinner 521, 521EU | - | - |
| Recommended Stripper | HumiSeal® Stripper 1072 | - | - |
| Thermal Shock, per MIL-I-46058C | -65 - 125 | °C | - |
| Coefficient of Thermal Expansion - TMA | 515.0 | ppm/°C | - |
| Glass Transition Temperature - DSC | 71.0 | °C | - |
| Modulus - DMA | 89.6 | MPa | - |
| Dielectric Withstand Voltage ( MIL-I-46058C) | min. 1500 | volts | - |
| Dielectric Constant ( 1MHz and 25°C ) | 3.5 | - | ASTM D150-98 |
| Dissipation Factor ( 1MHz and 25°C ) | 0.028 | ASTM D150-98 | - |
| Insulation Resistance (per MIL-I-46058C ) | 3.0 x 1014 (300TΩ) | ohms | - |
| Moisture Insulation Resistance, per MIL-I-46058C | 4.8 x 1010 (48GΩ) | ohms | - |
| Fungus Resistance | Passes | ASTM G21 | - |
| Resistance to Chemicals | Excellent | - | - |
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® 1A20R 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® products may be stored at temperatures of 0 to 35°C. HumiSeal® 1A20R should be stored away from sunlight and excessive heat, in tightly closed containers. If coatings are partially used, the container should be purged with dry nitrogen prior to resealing. 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
12 months