Customize - Urban Dictionary Store

Pro Customization

Create unique products with your own words and definitions

Preview

Personalize Your Design

Your Word

Your Definition

FR-4 (or FR4) is a NEMA grade designation for glass-reinforced epoxy laminate material. FR-4 is a composite material composed of woven fiberglass cloth with an epoxy resin binder that is flame resistant (self-extinguishing).

"FR" stands for "flame retardant", and does not denote that the material complies with the standard UL94V-0 unless testing is performed to UL 94, Vertical Flame testing in Section 8 at a compliant lab. The designation FR-4 was created by NEMA in 1968.

FR-4 glass epoxy is a popular and versatile high-pressure thermoset plastic laminate grade with good strength to weight ratios. With near zero water absorption, FR-4 is most commonly used as an [electrical] insulator possessing [considerable] mechanical strength. The material is known to retain its high mechanical values and electrical insulating qualities in both dry and humid conditions. These attributes, along with good fabrication [characteristics], lend utility to this grade for a wide variety of electrical and mechanical applications.

Grade designations for glass epoxy laminates are: G-10, G-11, FR-4, FR-5 and FR-6. Of these, FR-4 is the grade most widely in [use] today. G-10, the predecessor to FR-4, lacks FR-4's self-extinguishing flammability [characteristics]. Hence, FR-4 has sincewhen? replaced G-10 in most applications.

Text fits

Menu

Pro Customization

Preview

Personalize Your Design

Shopping Assistant