Conformal Coating

Overview

Conformal coating is a protective chemical layer or polymer film that is applied to electronic circuits to act as protection against moisture, dust, chemicals, and temperature extremes that, if uncoated (non-protected), could result in damage or failure of the electronics to function. The conformal coating ‘conforms’ to the circuit board topology and is electrically insulating maintaining long-term surface insulation resistance (SIR) levels and thus ensures the operational integrity of the assembly. Conformal coating also provides a barrier to air-borne contaminants from the operating environment, such as salt-spray, thus preventing corrosion.

Tri-M provides three options for conformal coating:

HumiSeal® 1B73 is a single component, fast drying, acrylic conformal coating intended for use on printed circuit assemblies. HumiSeal® 1B73 demonstrates excellent flexibility and electrical properties, fluoresces under UV light for ease of inspection and is easily repaired. HumiSeal® 1B73 coating is MIL-I-46058C qualified, IPC-CC-830 and RoHS Directive 2002/95/EC compliant, and recognized under UL File Number E105698.

Urethane conformal coating offers superior toughness and abrasion resistance and excellent protection from humidity and organic solvents.  The base resin conforms to MIL-I-46058C

Silicone conformal coating is ideal for high temperature environments.  Silicon conformal coating (422B) is a flexible funish product that provides a protective coating for printed circuit boards against moisture, corrosion and thermal shock.  It protects and insulates electrical and electronic components and assemblies, including generators, motors, transformers, relays and solenoid coils

Silicone

• Stable over wide temperature range (in general, -40C to 200C)[-40F to 392F]
• Flexible, provides dampening and impact protection
• Good moisture resistance
• High dielectric strength
• Low surface energy for better wetting

Urethane

• Good dielectric properties
• Good moisture resistance
• Solvent resistance
• Less reversion potential
• Abrasion resistance

Acrylic