Description
LC-E521 is a single or two side coated, 250°F (121°C) flame retardant epoxy aramid prepreg designed for a multitude of sandwich panel construction(s) as well as multiple ply laminates. This system can be used in a low tack version (press applications) or high tack and drape for complex contours and shapes.
Advantages
LC-E521 can be layed up using various core materials e.g. phenolic, aluminum, PVC foam without the use of additional film adhesives. Excellent impact and toughness allow for LC-E521 to perform well in a variety of finished part shapes and sizes. Low volatiles have also proven ideal for low void, multiple ply lay ups. A wide variety of cure cycles, cure temperatures and pressure also allow for LC-E521 to be very user friendly throughout processing.
Physical Properties
Density: 1.31 G/cm3 per ASTM D792
Gel Time @ 275°F (135°C): 4 -5 minutes
Glass Transition Temperature (Tg): 218°F (103°C)
Standard Resin Content: 50%
Cure Ply Thickness: .010"
Color: Cream
Tack: Low-Medium
Shelf Life / Out Life
Out Life @ 70°F (21°C): 7 days
Shelf Life @ 40°F (4°C): 6 months
Processing Recommendations
LC-E521 can be processed at temperatures from 235°F. (113°C.) for 90 minutes to 290°F. (143°C.) for 40 minutes, using low, medium or high pressure. A 250°F (121°C) cure for 60 minutes is optimal in most cases using press, vacuum bag or autoclave processing with 25 psi pressure.
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Mechanical Properties |
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Property |
Tested per Specification |
R.T. (75°F) |
R.T. Wet |
160°F |
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Ultimate Tensile Strength (psi)
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FTMS 406
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61,120
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56,250
|
56,420
|
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Tensile Modulus
PSI x 10E6 |
FTMS 406
|
3.5
|
N/A
|
3.2
|
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Ultimate Compression Strength (psi)
|
FTMS 406
|
22,640
|
17,620
|
16,500
|
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Compression Modulus
PSI x 10E6 |
FTMS 406
|
3.1
|
N/A
|
3.0
|
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Ultimate Flexural Strength (psi)
|
FTMS 406
|
54,650
|
N/A
|
41,600
|
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Flexural Modulus
PSI x 10E6 |
FTMS 406
|
3.2
|
N/A
|
N/A
|
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Interlaminar Shear (psi)
|
FTMS 406
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2,120
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N/A
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N/A
|
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Sandwich Peel Strength (in lbs/in)
|
FTMS 406
|
8
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N/A
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N/A
|
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Flatwise Tensile Strength (psi)
|
FTMS 406
|
840
|
N/A
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N/A
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*Tests performed using LC-E521-7781 @ 40% RC, press cured @ at 250° F, 25 psi pressure using ½” thick, 1/8” cell, 3# Nomex® Honeycomb Core.
**Additional fabric styles available upon request
Seller cannot anticipate all conditions under which seller’s products, or the products of other manufacturers in combination with seller’s products, may be used. Seller accepts no responsibility for results obtained by the application of seller’s products or the safety and suitability of seller’s products, either alone or in combination with other products. Users are advised to conduct their own tests to determine the safety and suitability of each such product or product combination for their own purposes. Unless otherwise agreed in writing, seller delivers the products without warranty of any nature, stated or implied, and buyers and users assume all responsibility and liability for loss or damage arising from the handling and use of said products, whether used alone or in combination with other products. Purchaser waives any claim against seller for direct, indirect, consequential or exemplary damages against seller, including without limitation, damage which may incur as a result of purchaser’s use or misuse of the product or the product’s failure to conform to any particular specification.