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Technical Data Sheet 

For Reference Only

Electrically Conductive, Silver Epoxy 

Number of Components:  Two Frozen Syringe Minimum Bond Line Cure Schedule*:   
Mix Ratio By Weight:  1:1    175°C  45 Seconds 
Specific Gravity:    2.67 150°C  5 Minutes 
Part A  2.03   120°C  15 Minutes 
Part B 3.07   80°C  3 Hours 
Pot Life: 2.5 Days      
Shelf Life: One year at 23°C One year at -40°C     

Note:Container(s) should be kept closed when not in use. For filled systems, mix contents of each container (A & B) thoroughly before mixing the two together. *Please see Applications Note available on our website.

Product Description:
EPO-TEK® H20E is a two component, 100% solids silver-filled epoxy system designed specifically for chip bonding in microelectronic and optoelectronic applications. It is also used extensively for thermal management applications due to its high thermal conductivity. It has proven itself to be extremely reliable over many years of service and is still the conductive adhesive of choice for new applications. Also available in a single component frozen syringe.

EPO-TEK® H20E Advantages & Application Notes:
Especially recommended for use in high speed epoxy chip bonding systems where very fast cures are desired.
Suggested for JEDEC Level III and II for plastic IC packaging.
NASA approved and is NON TOXIC—complying with USP Class VI Biocompatibility Standards.
Capable of resisting TC wire bonding temperatures in the range of 300°C to 400°C.
Ease of use; apply by dispensing, screen printing, die-stamping, or by hand.
Especially suited for high power devices and high current flow. High power LEDs.
Opto-electronic packaging material: LED, LCDs, and fiber optic components.

Typical Properties:(To be used as a guide only, not as a specification. Data below is not guaranteed. Different batches, conditions and applications yield differing results; Cure condition: 150°C/1 hour; *denotes test on lot acceptance basis) 

Physical Properties:

*Color:Part A: Silver Part B: Silver Weight Loss:
*Consistency: Smooth, thixotropic paste @ 200°C: 0.59% 
*Viscosity (@ 100 RPM/23°C): 2,200 – 3,200 cPs @ 250°C: 1.09% 
Thixotropic Index:3.69  @ 300°C: 1.67% 
*Glass Transition Temp.(Tg): ≥ 80°C (Dynamic Cure  Operating Temp: 
20—200°C /ISO 25 Min; Ramp -10—200°C @ 20°C/Min)  Continuous: -55°C to 200°C 
Coefficient of Thermal Expansion (CTE):  Intermittent: -55°C to 300°C 
Below Tg: 31 x 10-6 in/in/°C  Storage Modulus @ 23°C: 808,700 psi 
Above Tg: 158 x 10-6 in/in/°C  Ions: Clˉ 73 ppm 
Shore D Hardness: 75  Na  2 ppm 
Lap Shear Strength @ 23°C: 1,475 psi  NH498 ppm 
Die Shear Strength @ 23°C: > 5 Kg / 1,700 psi  K 3 ppm 
Degradation Temp. (TGA): 425°C  *Particle Size: ≤ 45 Microns 

Electrical Properties: 

*Volume Resistivity @ 23°C: ≤ 0.0004 Ohm-cm

Thermal Properties: 

Thermal Conductivity: 29 W/mK  Thermal Resistance: (Junction to Case) 
Based on Thermal Resistance Data: R = L x K-1 x A-1 TO-18 package with nickel-gold metallized 20 x 20 mil  chips and bonded with EPO-TEK® H20E (2 mils thick)
  EPO-TEK® H20E: 6.7 to 7.0°C/W 
  Solder: 4.0 to 5.0°C/W

Epoxies and Adhesives for Demanding Applications™ 

This information is based on data and tests believed to be accurate. Epoxy Technology, Inc. makes no warranties (expressed or implied) as to its accuracy and assumes no liability in connection with any use of this product. 


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