Knowde Enhanced TDS
Identification & Functionality
- Product Type
- Technologies
- Product Families
Features & Benefits
- Ready-to-Use Product Features
- Features & Benefits
- Maximum service temperature of 200 °C
- Fluoresces under UV-A light
- Suitable for use with selective coating equipment
- Excellent corrosion resistance
- Clean-up
- Clean spray system and equipment with MEK or acetone, MG #434.
- Recommended Preparation
- Clean the substrate with Isopropyl Alcohol, MG #824, so the surface is free of oils, dust, and other residues.
- Recommended Thinner
- When thinning is required, use MG #435 Thinner.
Applications & Uses
- Markets
- Applications
- Application Method
- Manual Spray Guns
Use a standard fluid nozzle gun with a minimum tip diameter of 0.8–1.0 mm. The settings listed below are recommendations; however, performance will vary with different brands:
Inlet Air flow Air cap 20–40 psi 10–15 SCFM 8–10 psi - Dilute 1-part coating to 1-part thinner (MG #4352 Thinner 2). Adjust ratio if required.
- Stir the coating gently, but thoroughly.
- Spray a test pattern to ensure good flow quality.
- Tilt the board at 45° and spray a thin even coat from a distance of 20–25 cm (8–10 in). Use spray-andrelease strokes with an even motion to avoid paint buildup in one spot. Start and end each stroke off the surface.
- Wait 3 min between coats to avoid trapping solvent.
- Rotate the board 90° and spray again to ensure good coverage.
- Apply additional coats until desired thickness is achieved (go to step 3).
- Let dry for 10 min at room temperature before applying heat cure.
- Dip Coat
Use a Ford or Zahn cup to monitor the viscosity of the coating, as the solvent will evaporate over time.
- Hang the PCB on a dipping arm.
- Slowly lower the PCB into a tank and leave immersed in the coating for 2 min to allow penetration.
- Slowly withdraw the PCB from the tank at a rate of approximately 6" per minute.
- Let dry for 3 min before applying additional coats or 10 min before heat cure.
- Brush
- 419D can be applied by brush for rework or touch-ups. Thinning is not required for most brush applications. Desired coating thickness can be achieved in a single application. Applied coating can be cured immediately.
- Selective Coating
For higher volume applications, coating can be applied via selective coating equipment. The settings listed below are recommendations and performance will vary with different brands.
Settings PVA Nordson Asymtek Platform PVA 650 SL 940E Valve FCS100 SC 280N Dilution None None Air Pressure N/Av 80 psi Fluid Pressure 17 psi 23 psi Dispense Height 10 mm 12.7 mm Pass Width 8 mm N/Av Coating Speed 400 mm/sec 381 mm/sec
Properties
- Physical Form
- Typical Properties
- Cured Properties
- Uncured Properties
- Cure Instructions
- Allow to dry at room temperature for 48 hours, or after letting sit for 8 minutes, cure the coating in an oven for 20 min @ 65 ˚C.
| Value | Units | Test Method / Conditions | |
| Dry Time To Handle (1 coat) | 8 | minute | — |
| Dry Time to Handle (2 coats) | 15 | minute | — |
| Minimum Recoat Time | 3 | minute | — |
| Recommended Film Thickness | 25-75 | μm | — |
| Theoretical Coverage (at 25 μm) | 70000 | cm2/L | — |
| Value | Units | Test Method / Conditions | |
| CTE (After Tg) | 275 | ppm/˚C | — |
| Dielectric Strength | 1056 | V/mil | — |
| Dielectric Withstand Voltage | min. 1500 | V | — |
| Dissipation Factor (at 1 MHz) | 0.012 | — | — |
| Dielectric Constant (at 1 MHz) | 1.99 | — | — |
| Glass Transition Temperature (Tg) | 29 | ˚C | — |
| Resistivity | 1.2 x 10¹⁵ | Ω·cm | — |
| Service Temperature Range | -40 to 200 | ˚C | — |
| Value | Units | Test Method / Conditions | |
| Calculated VOC | 289 | g/L | — |
| Density | 0.9 | g/mL | — |
| Solid Content | 28 | % | — |
| Viscosity (at 25 ˚C) | 10 | cP | — |
Regulatory & Compliance
- Chemical Inventories
- Certified
UL 94 V-0 (File# E203094)
Packaging & Availability
- Available Packaging
Cat. No. Packaging Net Vol. Net Wt. 422B-1L Can 945 mL 849 g 422B-4L Can 3.78 L 3.39 kg 422B-20L Pail 18.9 L 16.9 kg
Storage & Handling
- Shelf Life
- 5 Years
- Storage and Handling
- Store between -5 and 40 ˚C in a in a dry area, away from sunlight (see SDS).