Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Technologies
- Product Families
Features & Benefits
- Ready-to-Use Product Features
- Key Features
Color Pale yellow Rheology Liquid
Applications & Uses
- Applications
- Application Area
- Application Method
- Cure Method
- Application Technique
Application
The bulk product may be sprayed or brushed onto the circuit. Spraying or brushing will give a film thickness of 100 to 1000 microns. The product contains an UV trace to allow inspection of the board after coating to ensure complete and even coverage. Boards should be thoroughly cleaned before coating for best adhesion / performance. Coating over no clean fluxes is possible so long as other surface contaminants are not present.
Cleaning
The boards should be thoroughly cleaned before coating. This is required to ensure that satisfactory adhesion to the substrate is possible. Some flux residues must be removed, as they become corrosive if left on the PCB. ACC manufacture a range of 100% Ozone Friendly cleaning products - both solvent and water based, all clean to military standards (please contact ACC for further information).
Dip coating
This is not recommended for large scale production, small baths of < 5 litres are suitable but the ACC17 must not be exposed to the atmosphere for >4 minutes during any coating campaign and must be returned to the original container and sealed. Please note that continual use of ACC17 by this method will reduce the life of the product and may result in poor coating quality.
Spraying
Dispensing platforms include:
Nordson SL940
- Applicator SC300 swirl coat 0.61mm low cavity. 60 – 100 mm/second and 25 psi.
- Without dilution a coating thickness of 300 – 400 microns can be achieved which is touch dry in 4 minutes at 25°C and 55% humidity.
- Using applicator SC300 swirl coat, 0.61mm low cavity, 200 – 300 mm/second, 30 – 55 psi
- At the maximum recommended dilution of:
- 20 parts ACC17
- 80 parts ACC34 or ACC34UV
- a coating thickness of 200 - 300 microns can be achieved which is touch dry in 5 minutes at 25°C and 55% humidity.
PVA Delta 6
- Applicator FCS300 ES
- Without dilution a coating thickness of 140 – 180 microns can be achieved which is touch dry in 4 minutes at 25°C and 55% humidity.
- At the maximum recommended dilution of:
- 20 parts ACC17
- 80 parts ACC34 or ACC34UV
- a coating thickness of 50 – 80 microns can be achieved which is touch dry after 5 minutes at 25°C and 55% humidity.
Temperature, °C Time 16 48 hours 45 24 hours 60 1.5 hours 125 0.5 hours Brushing
The coating should be used at room temperature (above 16°C) using a good quality brush apply the product gently such as to achieve a good coating and not to disturb wiring. The board should be left to cure at 16 to 45°C with a relative humidity of >40%.
Drying time / curing conditions
For brushing and manual spraying the film will be touch dry after 4 minutes at 25°C / 55% humidity) and the full properties of the coating will be obtained after 16 minutes at room temperature.
Double coating
Whilst this should not normally be required, a second coating may be applied after the first coating is cured to ensure the two coats bond together.
Properties
- Color
- Flame Rating
- Physical Form
- Cured Elastomer Properties
- Electrical Properties
- Uncured Properties
- Relation Between Coating Thicknees and Cure Time
Thickness,
micronsCure Time,
minutes120 6 200 9 230 12 300 16 - Note
- Uncured Properties tested at 25°C, 55 (+/- 5%) Humidity
- Cured Elastomer properties tested after 7 days at 25°C, 55 (+/- 5%) Humidity on a 3 mm thick test sheet
- Uncured Product Property
Colour Pale yellow Rheology Liquid
| Value | Units | Test Method / Conditions | |
| CTE (Volumetric) | 310.0 | ppm/°C | — |
| CTE (Linear) | 930.0 | ppm/°C | — |
| Volatile Content | max. 500 | ppm | — |
| Hardness Shore A | 25.0 | — | ASTM D 2240-95 |
| Density (at 25°C) | 1.01 | g/ml | ASTM D70 |
| Flash Point | min. 150 | °C | ASTM D93 |
| Pensky Martin (CC) Solids | 100.0 | % | — |
| Working Temperature | -50 - 200 | °C | — |
| Value | Units | Test Method / Conditions | |
| Volume Resistance | 3.44 x 10¹⁴ | Ω.cm | ASTM D-257 |
| Surface Resistivity | 3.01 x 10¹⁴ | Ω | ASTM D-257 |
| Dielectric Strength | 18.5 | kV/mm | ASTM D-149 |
| Dielectric Constant (at 1kHZ) | 2.66 | — | ASTM D-150 |
| Value | Units | Test Method / Conditions | |
| Viscosity | 400.0 | mPas | Brookfield |
| Tack Free Time | 4.0 | Minutes | AMB001 |
| Cure to 300 μm | 16.0 | Minutes | — |
Regulatory & Compliance
- Certifications & Compliance
Storage & Handling
- Shelf Life
- 12 Months
- Storage and Shelf Life
When stored in original containers at 5 to 40°C the shelf life is expected to be 12 months. Once opened, refrigerated storage at <10°C is recommended.