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Arlon Electronic Materials 45NK Woven Kevlar® Reinforced Laminate and Prepreg
Categories: Polymer; Thermoset; Epoxy; Epoxy/Carbon Fiber Composite

Material Notes: 45NK is a woven Kevlar® aramid fiber reinforced multifunctional epoxy laminate system engineered to provide in-plane CTE values as low as 6 ppm/°C for compatibility with leadless alumina ceramic chip carriers (LCCCs) and other low expansion SMT devices where control of laminate expansion is critical for solder joint reliability. 45NK exceeds the requirements of IPC-4101/50 (Type AFG).

  • High Tg (170°C) for improved reliability through process and in-use
  • Low Dielectric Constant 3.9
  • High modulus (19 Mpsi) p-aramid woven fiber reinforcement with CTE of -4 ppm/°C provides superior X-Y CTE of 5-7 ppm/°C
  • Process compatible with conventional high Tg multifunctional epoxy systems
  • 100% Organic resin/reinforcement system is suitable for laser drilling
  • RoHS/WEEE compliant

Typical Applications:

  • SMT Board Designs using LCCCs or other low expansion chip carriers
  • SMT Designs requiring both low in-plane CTE and laser drilling

    Information provided by ARLON Electronic Materials.

  • Vendors:
    Available Properties
    • Density, ASTM D792 Method A
    • Water Absorption, IPC TM-650
    • Modulus of Elasticity, IPC TM-650
    • Poissons Ratio, ASTM D3039
    • Peel Strength, IPC TM-650 2.4.8, To Copper (1 oz./35 micron); After Process Solutions
    • Peel Strength, IPC TM-650 2.4.8, To Copper (1 oz./35 micron); After Thermal Stress
    • Peel Strength, IPC TM-650, To Copper (1 oz./35 micron); At Elevated Temperatures
    • Volume Resistivity, IPC TM-650, C96/35/90
    • Surface Resistance, IPC TM-650, C96/35/90
    • Dielectric Constant, IPC TM-650, may vary with resin %
    • Dielectric Strength, IPC TM-650
    • Dissipation Factor, IPC TM-650
    • CTE, linear, IPC TM-650 2.4.41
    • CTE, linear, Transverse to Flow, IPC TM-650 2.4.24, z, below Tg
    • CTE, linear, Transverse to Flow, IPC TM-650 2.4.24, z, above Tg
    • Thermal Conductivity, ASTM E1461
    • Glass Transition Temp, Tg, IPC TM-650 2.4.25, DSC
    • Flammability, UL94
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