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MG Chemicals 422B-340G

422B is a 1-part, acrylic-silicone blend conformal coating that cures to a durable, flexible and smooth finish. It is easy to apply and can be handled in only 8 minutes. It may be removed with appropriate strippers or soldered through for repair or rework. 422B is designed for applications where both high service temperature and flexibility are required. It puts minimum stress on components during thermal cycling, making it ideal for applications that involve a wide temperature range. It provides strong protection against moisture, corrosion, fungus, dirt, dust, thermal shock, short circuits, high-voltage arcing, and static discharge.

Product Type: 1K (1 component) Adhesive, Conformal Coating

Features: Arc Resistant, Chemical Resistant, Corrosion Resistant, Durable, Excellent Dirt Pick-up Resistance, Excellent Moisture Resistance, Flexible, Fungus Resistant, Good Smoothness, High Dust Control, Prevents Short Circuits, Prevents Static Discharges, Thermal Shock Resistant

Application Method: Spray

Chemical Family: Blends & Combinations

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Knowde Enhanced TDS

Identification & Functionality

Chemical Family

Features & Benefits

Key Attributes
  • Certified UL 94 V-0 (File# E203094)
  • Maximum constant service temperature of 200 °C
  • Fluoresces under UV-A light
  • Excellent corrosion resistance

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.

Spray

  1. Shake the can vigorously.
  2. Spray a test pattern to ensure good flow quality.
  3. 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.
  4. Wait 3 min before applying another coat, to avoid trapping solvent.
  5. Rotate the board 90° and spray again to ensure good coverage.
  6. Apply additional coats until desired thickness is achieved (go to step 3).
  7. Let dry 10 min at room temperature before applying heat cure.
  8. After use, clear the nozzle by inverting the can and briefly spraying until clear propellant comes out.

Cure Instructions

Allow to dry at room temperature for 48 hours, or after letting sit for 10 minutes, cure the coating in an oven for 20 min @ 65 ˚C.

Properties

Physical Form
Physical Properties
ValueUnitsTest Method / Conditions
Density0.81g/mL
Typical Properties
ValueUnitsTest Method / Conditions
Viscosity (at 25 ˚C)6cP
Calculated VOC627g/L
Cured Properties
ValueUnitsTest Method / Conditions
Resistivity1.2 x 10¹⁵Ω·cm
Dielectric Strength1 056V/mil
Dielectric Withstand Voltagemin. 1500V
Dielectric Constant (at 1 MHz)1.99
Dissipation Factor (at 1 MHz)0.012
Glass Transition Temperature (Tg)29˚C
CTE Prior Tg275ppm/˚C
Service Temperature Range-40 to 200˚C
Uncured Properties
ValueUnitsTest Method / Conditions
Percent Solids8.6%

Regulatory & Compliance

Certifications & Compliance

Technical Details & Test Data

Usage Parameters
Dry Time To Handle (1 coat)
Dry Time To Handle (2 coats)
8 min
15 min
Minimum Recoat Time 3 min
Recommended Film Thickness 25–75 μm
Theoretical Coverage @ 25 μm 4200 cm2

Packaging & Availability

Available Packaging
Cat. No. Packaging Net Volume Net Weight
422B-340G Aerosol 425 mL 340 g
422B-340GCA Aerosol 425 mL 340 g

Storage & Handling

Shelf Life
5 Years
Storage

Store between -5 and 40 ˚C in a in a dry area, away from sunlight .