Application Guidelines for Loctite Underfill Encapsulants
Table of Contents
Subject Page
Scope 3
Introduction to Underfill Encapsulants 3
Background 3
Underfill Classifications 4
Capillary Underfill 4
Fluxing (No-Flow) Underfill 4
Removable Underfill 4
Nature of Capillary Underfill 5
Designing Packages for Underfill Processability 7
Product Labeling 7
Product Code 7
Lot Number 8
Storage Conditions 8
Expiration Date 8
Product Documentation 9
Material Safety Data Sheet 9
Data Sheet 9
Certificate of Analysis 9
Handling Underfill 9
Receiving Frozen Shipments 9
Spoiled Shipment 9
Properly Unpacking a Frozen Shipment 9
Preparing Frozen Underfill for Inspection 10
Thawing Underfill 10
Refreezing Underfill 10
Shelf Life / Expiration Date 10
Repackaging in Cartridges or Syringes 11
Preparing Assemblies for Underfill 11
Effect of Flux Residues 11
Removing Flux Residues (Cleaning) 12
Removing Absorbed Moisture 12
Dispense Equipment 13
Dispensers 13
Pump Technology 14
Dispensing 15
Controlling Underfill Flow 15
Needles 15
Pump Flow Rate 15
Substrate Heating 16
Syringe Temperature Control 16
Dispense Patterns 16
Dispense Volume 18
Pot Life 18
Table of Contents (continued)
Subject Page
Curing 19
Post-dispense Exposure Limit 19
Cure Process 19
Rework of Cured Underfill 20
Safety 20
References 21
Table and Figures 22
Trouble-Shooting Guide 27
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