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What is G10?

g10 natural phenolic sheet half inch

G10 is surprisingly an electrical specification. It is a very dense woven fiberglass and epoxy panel that was originally used in the electrical industry due to it’s excellent insulation properties. FR4 is a fire retardant standard and G10 with FR4 designation has had bromine added for fire resistance. So what does that have to do with fins? Well it just so happens it is a widely available material that has high flexural, impact, and bond strength and is easy to machine and sand.