E761.pdf

Page 1 of 5 Rev. 3_11

Park Advanced Composite Materials

Product Overview

E-761 Epoxy Prepregs

Park’s E‐761 is a versatile self‐adhesive epoxy matrix for use in aerospace and commercial application where ease of processing and cost are key considerations.

Key Features & Benefits ‐ Controlled flow for ease of processing

‐ Self adhesive for honeycomb or foam sandwich laminates without the use of film adhesive

‐ Flexible cure temperature 180°F to 250°F

‐ Good electrical properties

‐ Flame and fire retardant per FAR 25.853

‐ Wet service temperatures up to 160°F

Product Forms ‐ Available on a wide variety of reinforcements, including fiberglass, quartz (including Astroquartz), graphite and aramid (including Kevlar®)

‐ Solution coated fabrics up to 60 inches wide

‐ Also available on aluminized fiberglass (TEF‐7)

‐ Compatible with Autoclave, Vacuum Bag/Oven or Press

Cure processes

Applications / Qualifications

‐ Radomes

‐ Aircraft Interiors

‐ Secondary Aircraft Structures

‐ Sandwich Panels

‐ MRI Resonators

‐ Widely specified on commercial and military aircraft programs

‐ Tested in accordance with BMS‐8‐79 upon request

Global Availability

For Information about Park’s materials:

North America

Waterbury, CT +1.203.755.1344

Newton, KS +1.316.281.6231

Asia Pacific +656.861.7117

Europe +33‐562‐985290 info@parkelectro.com www.parkelectro.com

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Technical Datasheet

Prepreg and Laminate Physical Properties - Glass Reinforced

Reinforcement

E-Glass

E-Glass

S2-Glass

Quartz Fabric Area Weight (Oz/SqYd) 8.95 3.16 8.97 8.5 Prepreg Resin Content (%) 39 45 32 38 Resin Flow (275°F, 50 psi) (%) 14 14 14 18 Volatiles (275°F, 8 min) (%) 1.5 1.5 1.5 1.5 Gel Time (sec) 240 350 240 350 Per Ply Thickness (inches) .009 .004 .010 .010 Tg (dry, by DMA) 115°C / 240°F

Prepreg and Laminate Physical Properties – Non-Glass Reinforcements

Reinforcement

3K PW

Carbon

3K 8HS

Carbon

Kevlar®

Spectra®

951 - PT

Fabric Area Weight (Oz/SqYd) 5.69 10.91 5.0 2.9 Prepreg Resin Content (%) 42 42 53 50 Resin Flow (275°F, 50 psi) (%) 10 12 20 6 Volatiles (275°F, 8 min) (%) 2% 2% 2.0 1.0 Gel Time (sec) 360 375 350 490 Per Ply Thickness (inches) .007 .014 .009 .010 Tg (dry, by DMA) 115°C / 240°F

Selected Laminate Electrical Properties

Frequency Dielectric Constant (Dk) Loss Tangent (Df)

9.375 GHz 4.20 0.013 E-761 w/ E-Glass

18 GHz 4.20 0.013

9.375 GHz 3.30 0.009 E-761 w/ Quartz

18 GHz 3.15 0.008

E-761 w/ Spectra® 951 5 – 18 GHz 2.6 – 2.8 0.010

Sandwich Properties (7781 reinforcement)

Mold Surface Bag Surface

Climbing Drum Peel (in-lb/3 in) ASTM-D-1781, room temp 14.7 14.8

Flatwise Tensile Strength (psi) 840 693 / 549 Long Beam Flexure Strength (lbs) 205 157 / 130 Long Beam Flexure (P/Y lb/in) 201 152 / 124

All test data provided are typical values and not intended to be specification values. For review of critical specification tolerances, please contact a Park representative directly. Park reserves the right to change these typical values as a natural process of refining our testing equipment and techniques.

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E-761 Epoxy Prepregs Laminate Mechanical Properties - Glass Reinforced

Reinforcement

E-Glass

E-Glass

S2-Glass

Quartz Tensile Strength, 0° (Ksi) ASTM-D-638

-65°F Dry 70°F Dry 160°F Dry 200°F Dry 70°F Wet 160°F Wet

Tensile Modulus (Msi) ASTM-D-638 -65°F Dry 70°F Dry 160°F Dry 200°F Dry

3.5 3.7 3.7 3.9 3.4 3.3

3.1 3.0 3.2 3.2 3.2 2.9

3.6 2.9

2.9

Compressive Strength (Ksi) ASTM-D-695 -65°F Dry 70°F Dry 160°F Dry 200°F Dry

Compressive Modulus (Msi) ASTM-D-695 -65°F Dry 70°F Dry 160°F Dry 200°F Dry

3.7

3.5 3.5

3.5

3.1 2.9

3.1

2.9 3.1

3.0 Flexural Strength (Ksi) ASTM-D-790

-65°F Dry 70°F Dry 160°F Dry 200°F Dry

Flexural Modulus (Msi) ASTM-D-790 -65°F Dry 70°F Dry 160°F Dry 200°F Dry

2.9 2.8

2.7

2.8 2.8 2.7 2.5

2.5

2.4

2.2 Short Beam Shear (Ksi) ASTM-D-2344

-65°F Dry 70°F Dry 160°F Dry 200°F Dry

11.5 9.0 6.5 5.2 8.0 6.0

11.6

6.3 5.4 7.0 5.2

8.6

7.0 5.3 2.2

All test data provided are typical values and not intended to be specification values. For review of critical specification tolerances, please contact a Park representative directly. Park reserves the right to change these typical values as a natural process of refining our testing

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E-761 Epoxy Prepregs Laminate Mechanical Properties - Non-Glass Reinforced

Reinforcement

3K PW

Carbon

3K 8HS

Carbon

Kevlar®

Spectra®

951 - PT

Tensile Strength, 0° (Ksi) ASTM-D-638 70°F Dry 160°F Dry 200°F Dry

Tensile Modulus (Msi) ASTM-D-638 70°F Dry 160°F Dry 200°F Dry

8.8 8.7 8.7 8.7 8.4

5.0

4.3

Compressive Strength (Ksi) ASTM-D-695 70°F Dry 160°F Dry 200°F Dry

Compressive Modulus (Msi) ASTM-D-695 70°F Dry 160°F Dry 200°F Dry

9.8 8.6 8.4 8.6

7.7

4.1

3.8

3.9

Flexural Strength (Ksi) ASTM-D-790 -65°F Dry 70°F Dry 160°F Dry 200°F Dry

6.2

Flexural Modulus (Msi) ASTM-D-790 -65°F Dry 70°F Dry 160°F Dry 200°F Dry

7.2 6.8 6.9 6.9 6.8

7.9

3.6 3.4 3.9

Short Beam Shear (Ksi) ASTM-D-2344 -65°F Dry 70°F Dry 160°F Dry 200°F Dry

7.4 5.5 4.7 6.5 4.4

7.9

5.6 6.0 4.9

5.4 4.2

All test data provided are typical values and not intended to be specification values. For review of critical specification tolerances, please contact a Park representative directly. Park reserves the right to change these typical values as a natural process of refining our testing

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Processing Guidelines

Prepreg Storage Life Tack Life: 14 days @ 75°F

Out Life: 30 days @ 75°F

Shelf Life: 6 months @ 0°F

Autoclave Cure Cycle ‐ Apply 24”Hg vacuum (minimum) and 40 ‐100 psi pressure

‐ Vent Vacuum when autoclave pressure reaches 15 – 20 psi

‐ Increase from room temperature to 250 – 260 °F at a rate of 2‐5°F/min (maximum)

Reduce cure temperature to 230°F (maximum) for Spectra® prepregs

‐ Hold cure temperature for 90 – 120 minutes

‐ Cool to 150°F at 8°F/min prior to releasing autoclave pressure

Vacuum Bag / Oven Cure Cycle ‐ Apply 24”Hg vacuum (minimum) and maintain throughout cure cycle

‐ Increase from room temperature to 250 – 260 °F at a rate of 2‐5°F/min (maximum)

Reduce cure temperature to 230°F (maximum) for Spectra® prepregs

‐Hold temperature and vacuum for 90 – 120 minutes

‐ Cool to 150°F at 8°F/min prior to releasing vacuum

All test data provided are typical values and not intended to be specification values. For review of critical specification tolerances, please contact a company representative directly. The above processing guides are recommendations only and intended for general review purposes. Process adjustments may be required to achieve optimum results in your specific manufacturing environment.

Park Electrochemical Corp. reserves the right to make changes without notice to any products described herein. Park does not assume any liability arising out of the application or use of any product descried herein; and it does not grant any license under its patent or other rights or any such rights of others. Park also disclaims all warranties whether expressed, implied or statutory, including implied warranties of merchantability or fitness for a particular purpose.

Aeroglide™, CoreFix®, Easycure™, Nelco®, Nelcote®, Nova™, PeelCote™ and Powerbond™ are trademarks of Park Electrochemical Corp.

Note: The following guidelines are provided to assist Park material users with general recommendations for successful processing. The recommendations are for general review purposes only and process adjustments may be required to achieve optimum results in your specific manufacturing environment.