MG Chemicals 842UR – Package Level Shielding

Chemical Family: Polyurethanes (PU)

Highly Conductive Silver Coating for EMI Shielding Semiconductor Packages 842UR is a 1-part, heat-cured, silver polyurethane coating. It is a smooth, flexible coating that provides excellent electrical conductivity at a low film thickness. It maintains flexibility at low temperatures, provides exceptional adhesion to a wide variety of substrates, and provides excellent environmental stability. 842UR is designed for large volume board-level or package-level EMI shielding applications. It can replace traditional metal lid, which reduces cost, board thickness, and mass.

Properties

Physical Form: Liquid

Product families

Applications

Electrical & Electronics — Packaging & Assembly

Electronics Coatings

Electrical & Electronics — Parts & Components

Semiconductor Manufacturing

Product Families

Ready-to-Use Products — Paints & Coatings

Protective Coatings

Other characteristics

Features: Corrosion Resistant, Durable, Electrically Conductive, Excellent Substrate Adhesion, Fast Cure, Flexible, Good Adhesion, Good Toughness, Low Temperature Flexibility
Product Type: 1K (1 component) Coating
Application Method: Brush, Spray
Markets: Electrical & Electronics
Shelf LIfe: 2 Years
Cure: Heat Cure; The product will not cure at room temperature. After letting sit for 3 minutes, cure the coating in an oven at one of these time/temperature options:
Technology: Ready-to-Use Products
Packaging Type: Cans
Manual Spray Guns: Use a standard HVLP (High Volume Low Pressure) fluid nozzle gun with a minimum tip diameter of 1.2–1.4 mm. The settings listed below are recommendations; however, performance will vary with different brands:. 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.
Application Methods: Brush
Spray
Benefits and Features: Provides superior EMI shielding; Excellent flexibility, toughness and adhesion; Stable under extreme environmental conditions (100 hours at 150 ˚C, 100 hours at 85 ˚C/85% R.H.); Withstands wave soldering; Designed for selective spray applications
Chemical Inventories: TSCA (USA)
Certifications and Compliance: RoHS Compliant; Waste Electrical & Electronic Equipment Directive (WEEE)
Ready to Use Product Features: Corrosion Resistant
Durable
Electrically Conductive
Excellent Substrate Adhesion
Fast Cure
Flexible
Good Adhesion
Good Toughness

Technical data

Table 1 of 3

6 rows

Characteristic	Value	Unit
Cure Times (at 125˚C)	30	minute
Cure Times (at 140˚C)	15	minute
Minimum Film Thickness	7	μm
Recoat Time	20	minute
Recommended Film Thickness	25	μm
Theoretical Coverage (at 2 mil, based on 100% transfer efficiency)	26 - 570	cm2/L

Table 2 of 3

4 rows

Characteristic	Value	Unit
Resistivity	1.5 x 10⁻⁴	Ω·cm
Salt Fog (at 35°C, 95°F, 96 h)	Excellent	—
Service Temperature Range	-40 to 125	˚C
Surface Resistance (at 25 μm)	0.008	Ω/sq

Table 3 of 3