Site Menu



April 2021
S
M
T
W
T
F
S
    123
45678910
11121314151617
18192021222324
252627282930 
View Full Calendar


News, Weather & Search

News:
CNN
Google News
BBC News
CBC News

Weather:



Search:
Google






Home > Forum > General Information > Let's Talk About Jesus > PTFE Laminates Becoming A Secondary Choice

Forum


PTFE Laminates Becoming A Secondary Choice
Started January 9, 2021 @ 9:11am by xysoom
Post Message 
xysoom


Posts: 615
 
PTFE Laminates Becoming A Secondary ChoiceJanuary 9, 2021 @ 9:11am
PTFE Laminates Becoming A Secondary Choice

With high-frequency technologies in PCBs gaining speed, manufacturers turned to polytetrafluoroethylene (PTFE) as a suitable laminate. Although costing more than FR4, PTFE is a synthetic thermoplastic fluoropolymer that offers excellent dielectric properties when the application uses microwaves. It also provides better dielectric loss (Df).To get more news about BT PCB, you can visit pcbmake official website.

In the past, the two basic choices for laminates became FR4 and PTFE. While PTFE offered advantages over FR4 for high-frequency applications, a major hurdle that was experienced with this laminate was that it had a high coefficient of thermal expansion (CTE). The laminate would change properties and expand when experiencing changes in temperature.

To overcome this issue, reinforced woven glass became added to PTFE that could combat against the size changes of the laminate. Manufacturers also began experimenting with ceramic fillers and microfiber glass to increase the dielectric constant (Dk) values of PTFE and enhance the thermal coefficient of dielectric constant (TCDk), as well as to make it easier to use the laminate when fabricating PCBs. With the addition of ceramic fillers, PTFE would experience an increase of DK values from 2.1 (without fillers) to a possible 2.94 (with fillers).

Manufacturers will often use a base material of PTFE and enhance the formula to offer different material compositions. Teflon, while sounding like a separate laminate material, is another type of PTFE-based formula. When woven glass is introduced into Teflon, the laminate is easier to work with although only experienced manufacturers should handle this material because of its difficulties during the lamination process.
 

Post Message 



2003-2013, GNI. All Rights Reserved.

Processing Time: 1.72295 seconds.
 
Management Login

Powered By FlexCMS
Powered By FlexCMS