Conformal Coatings

A conformal coating is used to protect electronic components from environmental factors. Adhesives used as conformal coatings are dual-curing: at their edges and visible surfaces they are cured with UV light; the shadowed areas – for example underneath components or chips – as well as deeper-lying regions are then post-cured by heat application.

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Smart Adhesive Solutions for PCBs brochure

To cover large surfaces with a conformal coating, we recommend low-viscosity adhesives. These adhesives are equally suited for spray coating, spin coating and dip coating.

Selective conformal coating can be realized with high-viscosity dam material: With a highly viscous adhesive, a frame or dam is formed, which is then filled with mobile adhesive. This process is also referred to as frame-and-fill.

UV-curing conformal coatings allow rapid curing resulting in the advantage of inline processing methods. Especially epoxy resin-based adhesives are silicone-free and ensure maximum media resistance.

The table below lists a selection of Hoenle adhesives suitable as conformal coating. Further products and custom solutions are available on request. To download the technical datasheets (TDS) please click on the adhesive name.

Adhesive	Application Areas	Viscosity [mPas]	Base	Curing *	Special Properties
Vitralit® 1671	Frame material for frame & fill applications	9,000-14,000 (Rheometer, 10s^-1)	epoxy	UV secondary heat cure	Stable frame compound high ion purity electronic grade adhesive high temperature conductivity low water absorption UL94 HB test passed
Vitralit® 2004 F	-	60-100 (LVT, 25 °C, Sp. 2/30 rpm)	epoxy	UV secondary heat cure	fluorescing flexible autoclavable dry surface after curing low ion content sprayable
Vitralit® 2007 F	-	150-350 (LVT, 25 °C, Sp. 2/30 rpm)	epoxy	UV secondary heat cure	fluorescing flexible autoclavable excellent chemical resistance low ion content
Vitralit® 2028	Conformal Coating, Encapsulation of electronic components	160-300	epoxy	UV secondary heat cure	Dry surface after UV-curing autoclavable excellent chemical resistance scratch resistant coating
Vitralit® 2009 F	-	100-200	epoxy	UV secondary heat cure	fluorescing flexible autoclavable high chemical resistance low ion content
Vitralit® 4451 MV F	-	2,000-3,000 (LVT, 25 °C, Sp. 4/30 rpm)	acrylate	UV, VIS	soft and elastic dry surface after curing protective coating fast curing fluorescing blue
Vitralit® UD 8050	Conformal Coatings Glob Top Encapsulants	8,000-11,000 (Rheometer, 25 °C, 5s-1)	acrylate	UV VIS secondary moisture cure	Isocyanacrylate; fast moisture post-curing in shadowed areas; easy to dispense with jet or dispenser e.a.; resistant to moisture; compatible with flux
Vitralit® UD 8055	Protective encapsulation of electronic components on PCBs Consumer electronics	5,000-8,000 (Rheometer, 25°C, 10s^-1)	acrylate	UV VIS moisture cure	High Tg Fast curing Compatible with flux Low ion content
Vitralit® UD 8056	Consumer Electronics Protective encapsulation of electronic components on PCBs	3,000-6,000 (Rheometer, 25°C, 10s^-1)	acrylate	UV / VIS / Moisture postcuring	High Tg, fast curing Compatible with flux Low ion content Passed UL94 HB test