ThunderClad 4R

Extreme Low Loss and High Thermal Reliability Laminate and Prepreg
Core: TU-943R; Prepreg: TU-943P R

ThunderClad 4R ( TU-943R ) is an advanced material designed with advanced low Dk glass Fabric for high speed computing, telecommunications, radio frequency super low loss filed applications. ThunderClad 4R electrical performance is competitive with PTFE-based, hydrocarbon-based very low loss materials, but capable for high layer count circuit board design with excellent thermal reliability.
ThunderClad 4R laminates also exhibit excellent moisture resistance, improved CTE, superior chemical resistance, thermal stability, CAF resistance, and also compatible with modified FR-4 processes.

Main Applications
Radio frequency
Backplane, High performance computing
Line cards, Storage
Servers, Telecom, Base station
Super Core Router and Switchers
Key Features
Excellent electrical and thermal properties
Dielectric constant is 3.22 @ 10GHz
Dissipation factor is 0.0015 @ 10GHz
Stable and flat Dk/Df performance over frequency and temperature variance.
Anti-CAF capability
Improved z-axis thermal expansion
Superior dimensional stability, thickness uniformity and flatness
Excellent moisture resistance and Lead Free reflow process compatible
Compatible with modified FR-4 processes
Property Typical Values
Tg (DMA) 230°C
Tg (TMA) 190°C
Td (TGA) 400°C
CTE z-axis  2.2%
T-260/ T288/ T300 > 60 min/ > 60 min/ > 60 min
Permittivity (RC 64%) @10GHz 3.22
Loss Tangent (RC 64%) @10GHz 0.0015
Industry Approvals
IPC-4101E Specification Number : /102
UL File Number: E189572
Flammability Rating: 94V-0
Maximum Operating Temperature: 140°C
Standard Availability
Thickness: 0.002” [0.05mm] to 0.062” [1.58mm], available in sheet or panel form
Copper Foil Cladding: 1/3 to 5 oz for built-up & double sides
Prepregs: Available in roll or panel form
Glass Styles: 1035, 1078, 2116 and others advanced low Dk fabric grades are available upon request.