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Electronics => Beginners => Topic started by: lain.cai on March 12, 2014, 06:10:40 pm

Title: [Solved] What kind of PCB coating is this?
Post by: lain.cai on March 12, 2014, 06:10:40 pm

I've found these black coatings on iPhone and Misfit Shine PCB; what are they and what are they used for?

(http://s28.postimg.org/y9hqawnih/biometric_adafruit_shine_activity_monitor_teardo.jpg) (http://postimg.org/image/y9hqawnih/)

(http://s28.postimg.org/4iulp52ix/Fw_Yv2_XIv_VEFoh_EUD.jpg) (http://postimg.org/image/4iulp52ix/)

Title: Re: What kind of PCB coating is this?
Post by: free_electron on March 12, 2014, 06:18:14 pm

That is underfill. They use that to mechanically strengthen the BGA to board mounting.

Title: Re: What kind of PCB coating is this?
Post by: lain.cai on March 12, 2014, 06:21:12 pm

Quote from: free_electron on March 12, 2014, 06:18:14 pm

That is underfill. They use that to mechanically strengthen the BGA to board mounting.

I see! Thank you so much :)