Talk:FR-4 - Wikipedia
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`https://en.wikipedia.org/wiki/Talk:FR-4
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`Talk:FR-4
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`Specifications of FR-4 vary from manufacturer to manufacturer and from batch to batch. Perhaps some information should
`be added regarding the frequency-dependant behaviour of FR-4 material?
`
`This data is highly subjective and is hardly a complete listing of the properties of FR-4
`
`Even if the data is incomplete, I disagree that this article reads as an advertisement. FR-4 is a family of materials, not a
`brand. 49giantsharks (talk) 17:28, 18 January 2010 (UTC)
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`I agree. This is not an advertisement. FR4 is widely used. This page and the subjective specifications are moderately
`useful. This would be a great resource if FR4 was fully specified with typical ranges. —Preceding unsigned comment added
`by 75.144.158.121 (talk) 12:46, 1 February 2010 (UTC) I have removed a space before "I agree." to make text wrap at right margin.
`--220.101.28.25 (talk) 07:35, 14 April 2010 (UTC)
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`I agree FR-4 is a material. I also agree that this is not an advertisement. However, I disagree that "typical property values"
`are subjective since they represent "typical" test results. NEMA, the National Electrical Manufacturing Association publishes
`only the "minimum property values" in their standards. Minimum property values are therefore less accurate & less useful
`than "typical properties" based on real test values. — Preceding unsigned comment added by Micangchr (talk • contribs) 12:59, 25 May
`2011 (UTC)
`
`Contents
`Table of specifications
`Thermal conductivity
`Units in FR4 specs
`Origin of name FR-4
`Copper
`
`Table of specifications
`
`Most of the specifications of the table are not cited. Specs do vary considerably from manufacturer to manufacturer, and for
`the subtype of FR-4. There should be a paragraph on the subtypes. Perhaps a table of typical values from a single
`manufacturer should be provided, augmented with more specific or complete data where available (as I have inserted for
`thermal conductivity data).--Paul K Clifford (talk) 01:03, 14 August 2013 (UTC)
`
`The typical specifications definitely need updating. The 3 inch upper limit for typical thickness must me a typo, I have never
`seen a PCB thicker than 0.2 inch. Even those thicknesses are usually pressed from thinner laminates. Copper thicknesses of
`half ounce is much more common than 2 or 3 ounce, due to multilayer and fine pitch this seems to be the dominant
`thickness today. PCBs with 2+ layers usually have 1/2 ounce copper on the outside onto which more copper is deposited
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`Talk:FR-4 - Wikipedia
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`https://en.wikipedia.org/wiki/Talk:FR-4
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`when manufacturing the through hole vias. --Bonf (talk) 08:14, 16 December 2013 (UTC)
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`Thermal conductivity
`
`Manufacturers do not specify the thermal conductivity in their datasheets, owing to the difficulty in measuring it. It is
`nevertheless an important value for understanding heat dissipation on PCBs. Most papers/discussions on thermal
`management of PCBs use a thermal conductivity value of 0.25 W/(m-K), but do not cite their source. I added thermal
`conductivity values to the table from actual measurements that are often cited by other papers about precise thermal
`management. I included two values, for in-plane and through-plane directions as the thermal conductivity is highly
`anisotropic. For each value I included two sources, showing the variation from one manufacturer's FR-4 board to another.--
`Paul K Clifford (talk) 01:03, 14 August 2013 (UTC)
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`Units in FR4 specs
`
`Regarding the thermal conductivity of FR4, listed in the specification table, note that the units of measure should be
`W/(m*K) and NOT w/(m/K) — Preceding unsigned comment added by 70.164.104.130 (talk) 15:20, 11 July 2013 (UTC)
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`I have changed the units for thermal conductivity to the correct MKS units of W/(m-K).--Paul K Clifford (talk) 00:55, 14
`August 2013 (UTC)
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`Origin of name FR-4
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`The french and dutch pages both say that FR-4 stands for "Flame Resistant". If this is correct, it should be part of the page.
`79.224.69.174 (talk) 21:07, 3 October 2013 (UTC)
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`Copper
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`There should be information, that copper on FR4 could be rolled or electrodeposited. — Preceding unsigned comment added by
`77.91.169.186 (talk) 15:12, 19 October 2016 (UTC)
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`Retrieved from "https://en.wikipedia.org/w/index.php?title=Talk:FR-4&oldid=907281568"
`
`This page was last edited on 21 July 2019, at 20:26 (UTC).
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`2 of 2
`
`2/28/2022, 9:44 PM
`
`CX-0850
`
`Page 2 of 2
`
`MASIMO 2065
`Apple v. Masimo
`IPR2022-01299
`
`