19 Aug 2022

Protecting PCBs used in critical applications

Farnell expands range of solutions for PCB protection

Farnell, an Avnet Company and global distributor of electronic components, products and solutions has announced an expansion of its
range of protective solutions for Printed Circuit Boards (PCBs) to provide engineers with optimal solutions for every application.

The range of new products added to Farnell’s portfolio includes solutions from some of the
world’s leading manufacturers, such as DOW, Ambersil, Robnor Resinlab, MG Chemicals,
Electrolube CHT and Farnell’s private label brand Multicomp Pro. The in-stock range features
flexible silicone and rugged epoxy resin through to conformal coating options which provide all-
round protection for PCBs.

Electronic components and subassemblies are susceptible to damage from impact, vibration,
corrosion, extreme temperatures, moisture and dust, to name just a few. These factors can
damage a PCB and ultimately the entire system. Engineers use plotting compounds and
conformal coatings to protect PCBs, however it is critically important to select the right type of
protection for high performance applications. Some of the most common problems impacting
PCBs include:

Operation in extreme temperatures;
Increased risk of oxidisation from moisture and humidity;
Proximity of high voltage components which can cause a short circuit;
Corrosive salt water in marine environments;
Reliability in critical environments such as aerospace and military equipment.

Farnell’s in-stock range of solutions for PCB protection include:

832HD Potting Compound from MG Chemicals: Solvent free and featuring a low mixed
viscosity, the 832HD plotting compound can easily penetrate small gaps and cavities
while providing excellent electrical insulation. It protects components from static
discharge, vibration, abrasion, thermal shock, environmental humidity, salt water, fungus,
and many other harsh chemicals. Offering a very wide service temperature range of -40
to 150 °C, it is simple to mix and has extremely high compressive and tensile strength
with excellent adhesion properties.

UR5041RP250G Polyurethane Resin from Electrolube: A two-part, high performance
resin system which provides excellent resistance to sea water and low water absorption,
making it ideal for marine environments. It offers good physical protection with strong tear
and oxidation resistance, as well as low temperature performance down to -60°C.

SYLGARD 170 Silicone Elastomer from DOW: An easy-to-use two-part, 1:1 mix,
general purpose encapsulant with good flowability, long working time and flame
resistance. Featuring low viscosity, the SYLGARD 170 Silicone Elastomer can be cured
at room temperature or heat accelerated. With moderate thermal conductivity it has a
long life and offers enhanced flow and fill in narrow spaces around complex geometries. It
can also be used as stress relief in applications where hard, rigid encapsulants can cause
damage during thermal cycling. Potential applications include power supplies, connectors, sensors, industrial controls, transformers, amplifiers, high voltage resistor packs and relays.
James McGregor, global head of test and tools at Farnell, said: “For products required in
rugged environments and a growing number of outdoor applications, high quality PCB protection
is vital to protect products from mechanical and environmental damage and ensure critical
systems are always available. Expanding our range of solutions for PCB protection is part of our
continuing commitment to grow our Test and Tools portfolio and ensure our customers can
access the latest solutions to meet all of their needs from a single source.”
Farnell offers a full range of market-leading test, tools and production supplies from stock to
support electronic design and test, with no minimum order value and an educational discount
programme. Customers have free access to online resources, data sheets, applications notes,
videos and webinars with excellent customer and technical support available 24/5 in local
Customers can now search the expanded PCB protection range from Farnell in EMEA and
element14 in APAC.

Company info: Premier Farnell Ltd