L-728
Woven Phenolic Prepreg
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Sandwich Properties*
Core: ¼” cell x 0.004” (6.35 mm cell x 0.10 mm) Aluminum Foil
Adhesive: 1 ply L-310FR each side
Facings: 2 plies L-728-285K each side
  • RT Flatwise Tensile Strength: 900 PSI (6.2 MPa)
  • RT Sandwich Peel Strength: 8 in lb/in (36 N/25 mm)
  • *Sandwich peel strength varies with the orientation of the fibers directly against the core and the test direction.
  • Fibers laid up parallel with the test direction produce minimum strengths.
  • Fibers laid up perpendicular to the test direction produce maximum strengths.
  • L-728-285K sandwich peel strength ranges from 5-10 in lb/in (22-44 N/25 mm).
Mechanical Data

 

LAMINATE PROPERTIES

PROPERTY

L-728-285K

L-728-220K

TEST METHOD

ULTIMATE TENSILE STRENGTH

 

 

 

Room Temperature (RT)

69 KSI (476 MPa)

60 KSI (414 MPa)

ASTM D638

160°F (71°C)

61 KSI (421 MPa)

51 KSI (352 MPa)

ASTM D638

RT(WET)

60 KSI (414 MPa)

51 KSI (352 MPa)

ASTM D638

TENSILE MODULUS

 

 

 

Room Temperature (RT)

9.6 MSI (66 GPa)

7.8 MSI (54 GPa)

ASTM D638

160°F (71°C)

9.1 MSI (63 GPa)

7.2 MSI (50 GPa)

ASTM D638

RT(WET)

8.2 MSI (57 GPa)

6.8 MSI (47 GPa)

ASTM D638

ULTIMATE COMPRESSION STRENGTH

 

 

 

Room Temperature (RT)

19 KSI (131 MPa)

16 KSI (110 MPa)

ASTM D695

160°F (71°C)

16 KSI (110 MPa)

15 KSI (103 MPa)

ASTM D695

RT(WET)

14 KSI (97 MPa)

14 KSI (97 MPa)

ASTM D695

COMPRESSION MODULUS

 

 

 

Room Temperature (RT)

10.6 MSI (73 GPa)

7.8 MSI (54 GPa)

ASTM D695

160°F (71°C)

7.9 MSI (54 GPa)

6.7 MSI (43 GPa)

ASTM D695

RT(WET)

6.8 MSI (47 GPa)

5.5 MSI (38 GPa)

ASTM D695

ULTIMATE FLEXURAL STRENGTH

 

 

 

Room Temperature (RT)

34 KSI (234 MPa)

25 KSI (172 MPa)

ASTM D790

160°F (71°C)

23 KSI (159 MPa)

14 KSI (97 MPa)

ASTM D790

FLEXURAL MODULUS

 

 

 

Room Temperature (RT)

3.1 MSI (21 GPa)

3.0 MSI (21 GPa)

ASTM D790

160°F (71°C)

2.7 MSI (19 GPa)

2.5 MSI (17 GPa)

ASTM D790

 
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NOTICE:Product data and parameters cited in this publication have been obtained in J.D. Lincoln, Inc. laboratories using the materials under carefully controlled conditions. The information, therefore, is believed to be accurate and correctly stated. Data of this type may be considered to be indicative of representative properties obtainable. J.D. Lincoln, Inc. cannot accept responsibility for the misapplication of these products, nor for their use under uncontrolled conditions. Numerical values resulting from the application of this material are dependant on processing details. It is recommended that the user develop his or her own application techniques and generate data consistent with his or her specific application and process.

 
       
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