Knowde Enhanced TDS
Identification & Functionality
- Chemical Family
- Technologies
- Product Families
Features & Benefits
- Labeling Claims
- Ready-to-Use Product Features
- Key Attributes
- Certified IPC-CC-830C
- 2:1 mix ratio
- Ready to spray
- Excellent corrosion and chemical resistance
- HAPS Free
- Fluoresces under UV-A light
- Suitable for use with selective coating equipment
Applications & Uses
- Application Method
- Application Instructions
Recommended Preparation
Clean the substrate with Isopropyl Alcohol, MG #824, so the surface is free of oils, dust, and other residues.
Mixing
Stir contents of the part A and part B container thoroughly. Measure 2 parts of A and 1 part of B by volume. Pour both parts into a mixing container while stirring. Ensure all contents are transferred. Thoroughly mix parts A and B together.
Brush
4225 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.
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 - Stir the mixed 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 15 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 2).
- Let dry 7 hours at room temperature before applying heat cure.
- Close the part A and B containers tightly between uses to prevent skinning.
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 mixed 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 15 min before applying additional coats or 7 hours before heat cure.
Selective Coating
For higher volume applications, coating can be applied via selective coating equipment. A fluid nozzle ranging from 0.5 mm to 1.0 mm diameter and 5–10 psi fluid pressure is recommended depending on nozzle size. Thin the coating to adjust viscosity to the level appropriate for the valve being used.
Cure Instructions
The product will cure at room temperature after 48 hours. After letting sit for 7 hours, cure the coating in an oven at one of these time/temperature options:
Temperature 65 °C 80 °C 100 °C Time 4 hours 2 hours 40 minutes Clean-up
Discard unused mixed epoxy and clean spray system and equipment with MEK or MG #434 Acetone.
Properties
- Physical Properties
- Typical Properties
- Cured Properties
- Uncured Properties
| Value | Units | Test Method / Conditions | |
| Density | 0.95 | g/mL | — |
| Value | Units | Test Method / Conditions | |
| Viscosity (at 25 ˚C) | 20 | cP | — |
| Calculated VOC | 698 | g/L | — |
| Value | Units | Test Method / Conditions | |
| Resistivity | 1.8 x 10¹² | Ω·cm | — |
| Dielectric Strength | 566 | V/mil | — |
| Dielectric Withstand Voltage | min. 1500 | V | — |
| Insulation Resistance | 1 x 10¹² | Ω | — |
| Moisture Insulation Resistance | 1 x 10¹² | Ω | — |
| Glass Transition Temperature (Tg) | 42 | ˚C | — |
| CTE Prior Tg | 210 | ppm/˚C | — |
| CTE After Tg | 245 | ppm/˚C | — |
| Service Temperature Range | -40 to 140 | ˚C | — |
| Value | Units | Test Method / Conditions | |
| Percent Solids | 41 | % | — |
Regulatory & Compliance
- Certifications & Compliance
- Chemical Inventories
Technical Details & Test Data
- Usage Parameters
Working Life (22 °C) 4 h Dry Time To Handle (1 coat) 7 h Minimum Recoat Time 15 min Recommended Film Thickness 25–50 μm Theoretical Coverage (25 μm) 162 440 cm2/L
Packaging & Availability
- Packaging Type
- Packaging and Supporting Products
Cat. No. Packaging Net Volume Net Weight 4225-1.35L 2 Can Kit 1.35 L 1.27 kg 4225-2.7L 3 Can Kit 2.70 L 2.54 kg 4225-10.8L 3 Can Kit 10.80 L 10.20 kg
Storage & Handling
- Shelf Life
- 2 Years
- Temperature Ranges
Store between -5 and 40 ˚C in a in a dry area, away from sunlight .