logo
Welcome Guest! To enable all features please Login or Register.

Notification

Icon
Error

Login


Options
View
Go to last post Go to first unread
goon2019  
#1 Posted : Saturday, January 09, 2021 2:10:40 PM(UTC)
goon2019

Rank: Advanced Member

Groups: Registered
Joined: 5/8/2019(UTC)
Posts: 966
China
Location: beijing

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.
Users browsing this topic
Forum Jump  
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.