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.
"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.
Fenhar FR-4 epoxy resin systems typically employ bromine, a halogen, to facilitate flame-resistant properties in FR-4 glass epoxy laminates. Some applications where thermal destruction of the material is a desirable traitcitation needed will still use G-10 non flame resistant.
by fenharxz.com August 7, 2024
Get the FR-4 mug.the meaning of "im just a girl" is a girls code word for wanting to break up with her current boyfriend and fuck her ex
by Yourboy_jay August 10, 2024
Get the im fr just a girl mug.by Ethski April 13, 2025
Get the ts game pmo fr bru my veiny dih cant handle ts fine shi 💔 mug.by aottic April 15, 2025
Get the on fr mug.by aottic April 15, 2025
Get the on fr mug.by aottic April 17, 2025
Get the on fr mug.Definition:
To be Franced is to be suddenly and spectacularly let down in a way that feels both avoidable and completely out of your control. It usually happens after someone confidently says “don’t worry, I’ve got it” — only for you to find out they absolutely didn’t.
Background:
The term “Franced” was born in chaotic workplaces and group projects, where someone’s lack of follow-through becomes your emergency. It captures that specific kind of betrayal that’s not evil — just incredibly frustrating, often involving vague promises, missing details, and last-minute disasters.
To be Franced is to be suddenly and spectacularly let down in a way that feels both avoidable and completely out of your control. It usually happens after someone confidently says “don’t worry, I’ve got it” — only for you to find out they absolutely didn’t.
Background:
The term “Franced” was born in chaotic workplaces and group projects, where someone’s lack of follow-through becomes your emergency. It captures that specific kind of betrayal that’s not evil — just incredibly frustrating, often involving vague promises, missing details, and last-minute disasters.
“I thought the venue was booked. Nope — totally Franced (Fr-ance-d) ”
“We were ready to present, but the files were missing. Got Franced (Fr-ance-d) hard.”
“She said she sent the email… turns out it was in her drafts. We’ve all been there — classic Francing.”
“We were ready to present, but the files were missing. Got Franced (Fr-ance-d) hard.”
“She said she sent the email… turns out it was in her drafts. We’ve all been there — classic Francing.”
by Creator of Workplace Humour May 15, 2025
Get the Franced (Fr-ance-d) mug.