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Metal adhesives

Master Bond EP125 High Temperature Resistant, Toughened Epoxy System
Categories: Polymer; Adhesive; Thermoset; Epoxy; Epoxy Adhesive; Epoxy Encapsulant, Unreinforced; Epoxy, High Temperature

Material Notes: Key Features:
  • High glass transition temperature, +240°C
  • Outstanding toughness
  • Exceptional chemical resistance
  • First rate dimensional stability
Product Description: Master Bond EP125 is a very special two part epoxy that excels in high temperature applications up to +600°F. It has an impressive glass transition temperature of around +240°C. EP125 has slightly different handling properties when compared to other epoxies, but ultimately, is easily processable. Part A is a moderate viscosity liquid and Part B is a powder. First, Part A is heated to 150-160°F, and then appropriate amount of Part B, based on a forgiving 100 to 50 mix ratio by weight, is added and stirred. The mixed system is a malleable paste, with an exceedingly long open time, that can be easily applied to the substrates. The curing is straightforward; 3-4 hours at 300°F or 2-3 hours at 350°F. For optimum properties, post curing for 12-24 hours at 400-450°F is recommended. EP125 bonds well to a wide variety of substrates, including metals, composites, glass, ceramics, rubbers and many plastics. Additionally, it is formulated as a toughened system allowing it to withstand rigorous thermal cycling. EP125 is an elite electrical insulator, especially as it retains compelling insulative properties at very high temperatures. Furthermore, it has superb chemical resistance to water, oils, acids, bases and many solvents. There are a few other notable properties, including remarkably high compressive strength, wonderful dimensional stability and low shrinkage upon curing. EP125 is an excellent candidate for challenging aerospace, electronic, optical, specialty OEM and related applications where these formidable attributes are desirable.

Product Advantages:

  • Excellent long-term thermal stability
  • Superior electrical insulation properties
  • 100% reactive—no solvents or other volatiles
  • High adhesion to metallic and non-metallic substrates
  • Robust physical strength profile especially in the compressive mode

Information provided by Master Bond Inc.

Vendors: Master Bond is a leading manufacturer of adhesives, sealants, coatings and potting compounds. Master Bond’s vast product line consists of over 3,000 epoxy, polyurethane, silicone, cyanoacrylate and latex adhesives that vary in viscosity, cure speed, strength, chemical resistance, electrical properties, etc. Our custom adhesives offer design flexibility and provide excellent bonding performance. Visit www.masterbond.com.

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Physical PropertiesMetricEnglishComments
Specific Gravity 1.49 g/cc1.49 g/cc
Viscosity 200000 - 400000 cP200000 - 400000 cPPart A
 250000 - 500000 cP250000 - 500000 cPmixed
 
Mechanical PropertiesMetricEnglishComments
Tensile Strength 24.1 - 27.6 MPa3500 - 4000 psi
Tensile Modulus  1.38 - 1.72 GPa
@Temperature 260 °C
200 - 250 ksi
@Temperature 500 °F
 3.10 - 3.45 GPa
@Temperature 23.9 °C
450 - 500 ksi
@Temperature 75.0 °F
Flexural Strength  17.2 - 20.7 MPa
@Temperature 260 °C
2500 - 3000 psi
@Temperature 500 °F
 55.2 - 62.1 MPa
@Temperature 23.9 °C
8000 - 9000 psi
@Temperature 75.0 °F
Compressive Strength 221 - 234 MPa32000 - 34000 psi
Adhesive Bond Strength  7.24 - 7.58 MPa
@Temperature 260 °C
1050 - 1100 psi
@Temperature 500 °F
after 1,000 hours at 500°F
 8.27 - 8.96 MPa
@Temperature 260 °C
1200 - 1300 psi
@Temperature 500 °F
aluminum to aluminum
 >= 17.2 MPa
@Temperature 23.9 °C
>= 2500 psi
@Temperature 75.0 °F
aluminum to aluminum
 
Electrical PropertiesMetricEnglishComments
Volume Resistivity  >= 1.00e+12 ohm-cm
@Temperature 260 °C
>= 1.00e+12 ohm-cm
@Temperature 500 °F
 >= 1.00e+14 ohm-cm
@Temperature 23.9 °C
>= 1.00e+14 ohm-cm
@Temperature 75.0 °F
Dielectric Constant  3.5
@Frequency 60 Hz,
Temperature 23.9 °C
3.5
@Frequency 60 Hz,
Temperature 75.0 °F
 3.8
@Frequency 60 Hz,
Temperature 260 °C
3.8
@Frequency 60 Hz,
Temperature 500 °F
Dissipation Factor  0.0060
@Frequency 60 Hz,
Temperature 23.9 °C
0.0060
@Frequency 60 Hz,
Temperature 75.0 °F
 0.013
@Frequency 60 Hz,
Temperature 260 °C
0.013
@Frequency 60 Hz,
Temperature 500 °F
 
Thermal PropertiesMetricEnglishComments
Maximum Service Temperature, Air 316 °C600 °F
Minimum Service Temperature, Air -62.2 °C-80.0 °F
Glass Transition Temp, Tg 240 °C464 °F
 
Processing PropertiesMetricEnglishComments
Cure Time  120 - 180 min
@Temperature 177 °C
2.00 - 3.00 hour
@Temperature 350 °F
 180 - 240 min
@Temperature 149 °C
3.00 - 4.00 hour
@Temperature 300 °F
 720 - 1440 min
@Temperature 204 - 232 °C
12.0 - 24.0 hour
@Temperature 400 - 450 °F
past cure
Working Life >= 7200 min>= 7200 minAfter mixing, 100 g batch
Shelf Life 12.0 Month
@Temperature <=23.9 °C
12.0 Month
@Temperature <=75.0 °F
in original, unopened containers
 
Descriptive Properties
Mixing Ratio100:50 by weightParts A to B
ViscositypowderPart B

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PMASTM913 / 185506

Metal adhesives

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