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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 since replaced G-10 in most applications. 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 trait will still use G-10 non flame resistant.

Article Title : FR-4
Article Snippet :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
Article Title : Russell 1000 Index
Article Snippet :The Russell 1000 Index is a stock market index that tracks the highest-ranking 1,000 stocks in the Russell 3000 Index, which represent about 93% of the
Article Title : A Certain Magical Index
Article Snippet :A Certain Magical Index (Japanese: とある魔術の禁書目録(インデックス), Hepburn: Toaru Majutsu no Indekkusu) is a Japanese light novel series written by Kazuma Kamachi
Article Title : S&P/TSX Composite Index
Article Snippet :The S&P/TSX Composite Index is the benchmark Canadian index representing roughly 70% of the total market capitalization on the Toronto Stock Exchange
Article Title : Index Medicus
Article Snippet :articles. From 1879 to 2004, Index Medicus was a comprehensive bibliographic index of such articles in the form of a print index or (in later years) its onscreen
Article Title : Grégory Montel
Article Snippet :Digne-les-Bains, in the Alpes-de-Haute-Provence. In 2013, his role in L'air de rien [fr] as Michel Delpech earned him a Cesar Award long-list nomination for Most
Article Title : Human Poverty Index
Article Snippet :economics Happy Planet Index (HPI) Human Development Index (HDI) Human Poverty Index country ranking in 2000 [fr] ISEW (Index of sustainable economic
Article Title : Farbrausch
Article Snippet :became well known in the demoscene in December 2000 with a 64k intro called "fr-08: .the .product". The demo achieved its small size through the use of procedural
Article Title : .ovh
Article Snippet :open to all via OVH, the sole registrar of .ovh domains. "DNSSEC". Afnic.fr. Retrieved 2015-02-19. "ovh extension: get your .ovh domain". Nic.ovh. Retrieved
Article Title : Normalized difference water index
Article Snippet :Normalized Difference Water Index (NDWI) may refer to one of at least two remote sensing-derived indexes related to liquid water: One is used to monitor

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