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Chemically Resistant adhesives

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Epoxy Technology EPO-TEK® T905BN-4 Thermally Conductive Epoxy
Categories: Polymer; Thermoset; Epoxy; Epoxy, Thermally Conductive

Material Notes: Product Description: EPO-TEK® T905BN-4 is a two component, room temperature cure, thermally conductive epoxy for general adhesive bonding, sealing, potting and encapsulation applications

Advantages & Application Notes:

  • A moderate viscosity resin with flowing properties enables potting of cavities, packages and housings.
  • Contains a coarse grade of filler, which needs to be taken into account in all bonding, sealing and potting applications.
  • Pure white color after cure allows for easy inspection by operators on common electronic packaging surfaces.
  • Versatility in cure: 23ºC and 100ºC ambient, box oven or tunnel oven processes.
  • Suggested Applications:
    • Hybrids: thermally conductive adhesive bonding ceramics and metals
    • Electronics:
      • General PCB level potting and adhesive applications. Bonding metal and composite heat sinks to PCBs or SMDs.
      • Transformers: potting of Cu coils, magnets, inductors and other SMDs into their respective casing.
    • Medical Devices
      • Heat sinking of x-ray and ultrasound circuits via adhesive and potting processes.

Information Provided by Epoxy Technology

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Physical PropertiesOriginal ValueComments
Specific Gravity 1.16 g/ccPart B
 1.63 g/ccPart A
Particle Size <= 300 µm
Viscosity 12000 - 18000 cP
@Temperature 23.0 °C
20 rpm
 
Mechanical PropertiesOriginal ValueComments
Hardness, Shore D 79
Tensile Modulus 1.152e+6 psiStorage
Shear Strength 1412 psiLap
 >= 1700 psiDie
 
Electrical PropertiesOriginal ValueComments
Volume Resistivity >= 4.00e+14 ohm-cm
Dielectric Constant 3.82
@Frequency 1000 Hz
Dissipation Factor 0.012
@Frequency 1000 Hz
 
Thermal PropertiesOriginal ValueComments
CTE, linear 24.0 µm/m-°CBelow Tg
 120 µm/m-°CAbove Tg
Thermal Conductivity 1.78 W/m-K
Maximum Service Temperature, Air 200 °CContinuous
 300 °CIntermittent
Minimum Service Temperature, Air -55.0 °CContinuous
 -55.0 °CIntermittent
Glass Transition Temp, Tg >= 50.0 °CDynamic Cure 20—200°C /ISO 25 Min; Ramp 40—200°C @ 20°C/Min
Decomposition Temperature 350 °CDegradation Temperature
 
Processing PropertiesOriginal ValueComments
Cure Time 1.00 hour
@Temperature 80.0 °C
Minimum Bond Line
 24.0 hour
@Temperature 23.0 °C
Minimum Bond Line
Pot Life 60 min
Shelf Life 12.0 Month
@Temperature 25.0 °C
 
Descriptive Properties
ColorLight MauvePart B
 WhitePart A
ConsistencyGranular paste
Mix Ratio by Weight100:25
Number of ComponentsTwo
Thixotropic Index2.58
Weight Loss0.18%200°C
 0.64%250°C
 1.44%300°C

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PPOXYT100 / 141139

Chemically Resistant adhesives

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