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MG Chemicals 843WB - Electromagnetic Shielding Paint

843WB is a 1-part, water-based conductive paint, pigmented with highly conductive silvercoated copper flake. It is easy to use, with no let-down and no heat cure necessary. It adheres strongly to most injection-molded plastics, such as ABS, PBT and PVA. It also bonds well to drywall and can be painted over with common architectural paints. 843WB is designed to reduce EMI/RFI interferences in architectural and electronic applications.

Product Type: 1K (1 component) Coating, Conductive Coating, Waterborne Coating

Features: Bondability, Electromagnetic Interference Shielding, Fast Drying, Low VOC, Radio Frequency Shielding (RFI)

Compatible Substrates & Surfaces: Plastics

Application Method: Brush, Roller, Spray

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Knowde Enhanced TDS

Identification & Functionality

Features & Benefits

Key Attributes
  • Provides excellent EMI/RFI shielding over a broad range of frequencies
  • Non-flammable and no noxious odors
  • Ships as a non-DG by air
  • Low VOC content

Applications & Uses

Application Method
Compatible Substrates & Surfaces
Recommended Preparation
  • Plastic - Clean the substrate with Isopropyl Alcohol, MG #824, so the surface is free of oils, dust, and other residues.
  • Drywall - For new drywall, apply directly on top of the drywall primer, after the primer has properly cured.

When applying on top of existing paint, first wash the wall with a solution of T.S.P. diluted with water at a 1:10 ratio, to ensure good adhesion.

Paint Roller

This product may be applied with a standard paint roller. Thinning is not required.

Manual Spray Guns

Use a standard fluid nozzle gun to spray the paint. The settings listed below are recommendations; however, performance will vary with different brands:

LVMP HVLP
Nozzle tip diameter 1.8 mm 1.8 mm
Inlet pressure 5–15 psi 5–15 psi
Air flow 10–15 SCFM 8.3 SCFM
Air cap 5–10 psi 5–10 psi

When using a pressure pot and agitator, keep the agitator at low mixing speed with air pressure of 20–50 psi. Use the lowest pressure necessary to keep the particles suspended.

Selective Coating

For higher volume applications, paint can be applied via selective coating equipment. Use a system with constant fluid recirculation to keep the particles from settling in the lines. The fluid nozzle must be 1.8 mm in diameter and 5 - 10 psi fluid pressure is recommended.

Clean-up

Clean the spray system and equipment with tap water after use.

Properties

Physical Properties
ValueUnitsTest Method / Conditions
Density1.32g/mL
Typical Properties
ValueUnitsTest Method / Conditions
Viscosity (at 25 ˚C)660cP
Calculated VOC37g/L
Cured Properties
ValueUnitsTest Method / Conditions
Resistivity5.3 x 10⁻⁴Ω·cm
Surface Resistance (at 50 μm)0.02Ω/sq
Service Temperature Range-40 to 120˚C
Uncured Properties
ValueUnitsTest Method / Conditions
Percent Solids42%

Regulatory & Compliance

Quality Standards

Technical Details & Test Data

Shielding Attenuation

MG Chemicals 843WB - Electromagnetic Shielding Paint - Shielding Attenuation

Test performed with a two-coat thickness.

Surface Resistance by Paint Thickness

MG Chemicals 843WB - Electromagnetic Shielding Paint - Surface Resistance By Paint Thickness

Cure Instructions

Allow to dry at room temperature for 24 hours, or after letting sit for 20 minutes, cure the paint in an oven for 2.5 hours @ 65 ˚C.

Usage Parameters
Recoat Time (plastic) 20 min
Recoat Time (drywall) 5 min
Cure Times 24 h @ 22 ˚C
2.5 h @ 65 ˚C
Recommended Film Thickness 50 μm
Minimum Film Thickness 30 μm
Theoretical Coverage @ 2 mil (based on 100% transfer efficiency) 47040 cm2/L

Packaging & Availability

Packaging Type
Packaging and Supporting Products
Cat. No. Packaging Net Volume Net Weight
843WB-15ML Jar 12 mL 15.8 g
843WB-150ML Bottle 150 mL 198 g
843WB-850ML Can 850 mL 1.12 kg
843WB-3.78L Can 3.60 L 4.76 kg

Storage & Handling

Shelf Life
2.5 Years
Storage

Store between -20 and 27 ˚C in a dry area, away from sunlight (see SDS). If exposed to freezing temperatures during storage or transport, keep product at room temperature for at least two days and ensure it is fully homogeneous prior to use.