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Chemically Resistant adhesives

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Epoxy Technology EPO-TEK® H20F Electrically Conductive, Flexible Epoxy
Categories: Polymer; Adhesive; Thermoset; Epoxy; Epoxy, Electrically Conductive

Material Notes: Product Description: EPO-TEK® H20F is a two component, flexible silver epoxy. It was designed for flexible type circuitry, such as switching circuits in a flexible panel system, as well as large die-attach or substrate attach.

Advantages & Application Notes:

  • Flexible alternative to EPO-TEK® H20E, designed to offer lower stress, less cracking, and more flexibility.
  • Rheology provides a very soft, smooth, thixotropic paste. No solvents are present.
  • A film suitable for Kapton or Mylar can be flexed 180 degrees and creased without de-lamination or loss of conductivity; can be used instead of conductive silicone RTVs.
  • Can be applied by screen printing, stamping, roller coating techniques; or hand applied.
  • Recommended for fiber-optic packaging. Also suggested for bonding SAW devices, as a low stress adhesive.
  • Applications or end-use could be speaker or microphone circuit related.
  • Hybrid level die attach epoxy capable of resisting wire bonding operations. Also, lid sealing operations will not affect bonded chips in the package.
  • Suggested as a low stress conductive adhesive for large die sizes, as well as oversized components or substrates.

Information Provided by Epoxy Technology

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Physical PropertiesOriginal ValueComments
Specific Gravity 2.51 g/ccPart A
 3.56 g/ccPart B
Particle Size <= 45 µm
Viscosity 1500 - 3000 cP
@Temperature 23.0 °C
100 rpm
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 46
Tensile Modulus 21153 psiStorage
Shear Strength >= 680 psiDie
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity <= 0.00010 ohm-cm
 
Thermal PropertiesOriginal ValueComments
CTE, linear 10.0 µm/m-°CBelow Tg
Thermal Conductivity 4.10 W/m-K
Maximum Service Temperature, Air 175 °CContinuous
 275 °CIntermittent
Minimum Service Temperature, Air -55.0 °CContinuous
 -55.0 °CIntermittent
Glass Transition Temp, Tg >= 20.0 °CDynamic Cure 20—200°C /ISO 25 Min; Ramp -10—200°C @ 20°C/Min
Decomposition Temperature 384 °CDegradation Temperature
 
Processing PropertiesOriginal ValueComments
Cure Time 10.0 min
@Temperature 150 °C
Minimum Bond Line
 20.0 min
@Temperature 120 °C
Minimum Bond Line
Pot Life 2160 min
Shelf Life 12.0 Month
@Temperature 25.0 °C
 
Descriptive Properties
ColorSilverPart A
 SilverPart B
ConsistencySmooth thixotropic paste
Mix Ratio by Weight1:1
Number of ComponentsTwo
Thixotropic Index4
Weight Loss0.51%200°C
 0.78%250°C
 1.79%300°C

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PPOXYT036 / 141075

Chemically Resistant adhesives

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