2K550 Two Part Conformal Coating

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2K550 is a flame-retardant, solvent-free two-part polyurethane conformal coating. It has been carefully formulated to combine the protection and properties of an encapsulation resin, while keeping the ease of application of a conformal coating. 2K550 is formulated for application using specially designed applicators from both PVA (VPX-2KS) and Nordson Asymtek (Latest in the AM Range) selective coating machines. 2K550 is applied more thickly than the average coating (150-350μm) providing excellent coverage over component leads and packages, while its extreme flexibility prevents cracking during thermal shock testing.

As with 2K500, 2K550 offers additional abrasion resistance compared to the other 2K range.


Approvals RoHS Compliant (2015/863/EU): Yes
REACH Compliant: Yes
IPC-CC-830 Rev. C: Meets Requirements
UL746 Meets UL94 V-0
Liquid Properties Appearance: Opaque Black Liquid
Density @ 20°C (g/ml): 1.46 (mixed)
Flash Point: >100⁰C
Min. Solids Content (1hr @80˚C): >99%
Mix Ratio: 2:1 v/v
Mixed System Viscosity @ 25˚C: Sprayable
Useable Life @ 20°C: 180 Minutes
Touch Dry Time at 20°C: 240 Minutes
Recommended Drying Time: 10 Minutes @ 80°C
Dry Film Coating Colour: Opaque Black
Recommended Coating Thickness: 100-300µm
Temperature Range: -40 to +130⁰C
Thermal Shock Range: -65 to +125⁰C*
Thermal Shock (1000 cycles): No cracking, blistering or delamination*
Shore Hardness: A95
Dielectric Strength: 90 kV/mm
Surface Insulation Resistance: 1 x 1015 Ω
Moisture Resistance (IPC-CC-830): 9.24 x 109 Ω
Flammability: Meets UL94 V-0

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