Materials
No Flow Underfill (P-Bond) No-N2 No-Clean Flux (P-Coat)


No-N2 No-Clean Flux (P-Coat)

APS P-Coat F0284 is a polymer flux which has the following advantages:
1.
Does not require N2 during reflow - Cost reduction!
2.
Does not require cleaning after reflow - Process step reduction!
3.
Increases shear strength by 20% - Better reliability and impact resistance!
4.
Available for flip chip & BGA applications
5.
Utilizes existing infrastructure
6.
Halide-free
7.
Lead-free compatible

Concept of P-Coat:
P-Coat’s unique composition, when activated during reflow, forms a protective film that prevents reoxidation while its fluxing properties removes even the toughest metal oxides. Upon completion of reflow, the thermosetting resin and hardener cross-links resulting in the inactivation of the fluxing reactive groups and subsequent curing of P-Coat. This forms a protective fillet which increases the shear strength and thus the reliability of the joints.
 

Flip Chip Application:
P-Coat can be used for flip chip attachments as seen on the right. The protective fillet around the bumps, highlighted by the arrows, increases the joint integrity.
The cross-section picture shows good solder wetting and joint formation.

BGA Application:
P-Coat can be also used for BGA ball attachments as seen on the left. The protective fillet of the BGA ball, highlighted by the arrows, increases the joint integrity.


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