Henkel Loctite® ECCOBOND UF 3820 Epoxy

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Henkel Loctite® ECCOBOND UF 3820 Epoxy
Categories:	Polymer; Thermoset; Epoxy
Material Notes:	Appearance: Black liquid Cure: Heat cure Product Benefits: High Tg Easy rework Halogen free One component Fast cure at moderate temperatures Room temperature flow capability High fracture toughness Excellent thermal cycle performance Compatible with most Pb-free solders Stable electrical performance under thermal/humidity bias Application: Underfill Typical Package Application: CSP, WLCSP and BGA LOCTITE ECCOBOND UF 3820 reworkable underfill is specially designed for CSP, WLCSP and BGA applications. It is formulated to cure quickly at moderate temperatures to minimize stress to other components. This material's high glass transition temperature and high fracture toughness enables excellent protection of solder joints during thermal cycling. Information provided by Loctite®
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Physical Properties	Original Value	Comments

Specific Gravity	1.24 g/cc
Brookfield Viscosity	340 cP @Shear Rate 1000 1/s	CP50-1

Mechanical Properties	Original Value	Comments
Tensile Modulus	25.0 MPa @Temperature 200 °C	Storage, Cured, DMA
	50.0 MPa @Temperature 150 °C	Storage, Cured, DMA
	2070 MPa @Temperature 100 °C	Storage, Cured, DMA
	2560 MPa @Temperature 25.0 °C	Storage, Cured, DMA
Fracture Toughness	1.50 MPa-m½	Instron
Shear Strength	10.9 MPa	PCB to PCB

Electrical Properties	Original Value	Comments
Dielectric Constant	2.93 @Frequency 5.00e+9 Hz
	2.94 @Frequency 8.50e+8 Hz
	2.96 @Frequency 2.50e+9 Hz
	3.02 @Frequency 1.575e+9 Hz
Dissipation Factor	0.047 @Frequency 2.50e+9 Hz
	0.048 @Frequency 8.50e+8 Hz
	0.052 @Frequency 1.575e+9 Hz
	0.052 @Frequency 5.00e+9 Hz

Thermal Properties	Original Value	Comments
CTE, linear	51.0 µm/m-°C	Cured, Below Tg
	172 µm/m-°C	Cured, Above Tg
Glass Transition Temp, Tg	133 °C	Cured, by TMA

Processing Properties	Original Value	Comments
Cure Time	3.00 min @Temperature 160 °C	Alternate Cure Schedule
	5.00 min @Temperature 150 °C	Alternate Cure Schedule
	10.0 min @Temperature 130 °C
Working Life	24.0 hour	Worklife, 25% change in viscosity
Shelf Life	6.00 Month @Temperature -40.0 °C

Descriptive Properties
Thixotropic Index	1.1	Uncured

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PLOCT5096 / 255307

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