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20 mil RO4003C PCB
20 mil RO4003C PCB

IsoClad 917 High Frequency PCB: Advancing Rogers PCB Substrate Technology

  • November 21. 2023

Today, we will delve into the groundbreaking technology of Rogers IsoClad 917 laminates, which are revolutionizing the realm of Rogers printed circuit board substrates. These laminates feature a unique composition of non-woven fiberglass and PTFE composites in a low ratio, resulting in the lowest dielectric constant and dissipation factor within their class.

The incorporation of non-woven fiberglass reinforcement enables the use of IsoClad 917 laminates in applications requiring flexibility and shaping, such as conformal or wrap-around antennas. Notably, the longer random fibers and proprietary manufacturing process contribute to enhanced dimensional stability and uniformity of dielectric constant, surpassing competing laminates in the market.

Let us now explore the typical properties of IsoClad 917 laminates.

IsoClad 917 High Frequency PCB

IsoClad 917 Typical Properties

One of the notable features of IsoClad 917 is its dielectric constant, which ranges between 2.17 and 2.20 depending on the specific formulation.

Rogers IsoClad 917 Printed Circuit Board exhibits an exceptionally low dissipation factor of 0.0013 at 10 GHz, indicating minimal signal energy loss during transmission.

With a high volume resistivity of 1.5 x 10^10 MΩ-cm and surface resistivity of 1.0 x 10^9 MΩ, IsoClad 917 ensures excellent electrical insulation.

It boasts a long arc resistance of over 180 seconds and a high dielectric breakdown voltage exceeding 45 kV.

In terms of thermal properties, IsoClad 917 demonstrates a thermal coefficient of Er of -157 ppm/°C, implying a change in dielectric constant with temperature. However, achieving an even lower thermal coefficient could be desirable.

IsoClad 917 exhibits a low coefficient of thermal expansion, with values of 46 ppm/°C in the X-axis, 47 ppm/°C in the Y-axis, and 236 ppm/°C in the Z-axis.

The material's thermal conductivity at 100°C is relatively modest at 0.263 W/mK.

In terms of mechanical properties, IsoClad 917 displays good performance. It possesses a peel strength of 10 lbs. per inch after thermal testing, a tensile modulus of 133-120 kpsi, a tensile strength of 4.3-3.8 kpsi, a compressive modulus of 182 kpsi, and a flexural modulus of 213 kpsi.

With a density of 2.23 g/cm3 at 23°C, IsoClad 917 offers a relatively high weight-to-volume ratio, which can be advantageous in specific applications.

IsoClad 917 demonstrates a low water absorption rate of 0.04%, indicating minimal susceptibility to moisture in the environment.

Regarding outgassing properties, the material exhibits a minimal total mass loss of 0.02% and collected volatile condensable material of 0.00%, meeting stringent requirements in low-pressure conditions.

Rogers IsoClad 917 Printed Circuit Board complies with the UL94-V0 flammability standard.


IsoClad 917


Test Method

Dielectric Constant @ 10 GHz

2.17, 2.20


IPC TM-650

Dissipation Factor @ 10 GHz



IPC TM-650

Volume Resistivity (MΩ-cm)

1.5 x 1010


IPC TM-650

Surface Resistivity (MΩ)

1.0 x 109


IPC TM-650

Arc Resistance (seconds)



ASTM D-495

Dielectric Breakdown (kv)



ASTM D-149

Thermal Coefficient of Er (ppm/°C)


-10°C to +140°C

IPC TM-650

Coefficient of Thermal Expansion (ppm/°C)

0°C to 100°C

IPC TM-650 2.4.24 Mettler 3000 Thermomechanical Analyzer

X Axis


Y Axis


Z Axis


Thermal Conductivity (W/mK)



ASTM E-1225

Peel Strength  (lbs.per inch)


After Thermal

IPC TM-650 2.4.8

Tensile Modulus (kpsi)

133, 120

A, 23°C

ASTM D-638

Tensile Strength (kpsi)

4.3, 3.8

A, 23°C

ASTM D-882

Compressive Modulus (kpsi)


A, 23°C

ASTM D-695

Flexural Modulus (kpsi)


A, 23°C

ASTM D-790

Density (g/cm3)


A, 23°C

ASTM D-792 Method A

Water Absorption (%)


E1/105 + D24/23

MIL-S-13949H 3.7.7
IPC TM-650


Total Mass Loss (%)


125°C, ≤10-6 torr

Maximum 1.00%

Collected Volatile Condensable Material (%)


Maximum 0.10%

Water Vapor Regain (%)


Visible Condensate (±)



Meets requirements of

C48/23/50, E24/125

UL 94 Vertical Burn IPC TM-650 2.3.10

IsoClad 917 PCB Capability

We provide a range of PCB capabilities utilizing IsoClad 917 substrates:

Single-sided boards, double-sided boards, multi-layer boards, and hybrid designs are available.

Copper weights on tracks and pads include options for 1oz (35µm) and 2oz (70µm).

Dielectric thicknesses are offered at 20mil (0.508mm), 31mil (0.787mm), and 62mil (1.575mm).

The maximum board size is 400mm by 500mm, accommodating single large boards or multiple designs on a single sheet.

Various solder mask options in green, black, blue, yellow, and red are available to suit design requirements.

Surface finishes include immersion gold, HASL, immersion silver, immersion tin, ENEPIG, OSP, bare copper, and pure gold plating.

PCB Material:

Non-woven Fiberglass / PTFE Composites


IsoClad 917

Dielectric constant:

2.17 or 2.20  (10 GHz)

Dissipation factor

0.0013 (10 GHz)

Layer count:

Single Sided, Double Sided, Multi-layer PCB, Hybrid PCB

Copper weight:

1oz (35µm), 2oz (70µm)

Dielectric thickness

20mil (0.508mm), 31mil (0.787mm),  62mil (1.575mm)

PCB size:

≤400mm X 500mm

Solder mask:

Green, Black, Blue, Yellow, Red etc.

Surface finish:

Immersion gold, HASL, Immersion silver, Immersion tin, ENEPIG, OSP, Bare copper, Pure gold plated etc..

A Sample of IsoClad 917 PCB

Displayedfollowing is a hybrid design Rogers IsoClad 917 PCB, showcasing the versatility of this material. It finds typical applications in conformal antennas, stripline and microstrip circuits, guidance systems, and radar systems, among others.

IsoClad 917 Printed Circuit Board


IsoClad 917 Rogers material can be seamlessly integrated into different manufacturing tooling systems. The choice of pin types, tooling formats, and punching methods will depend on the manufacturing facility's capabilities and registration requirements. Maintaining copper around tooling holes is recommended to improve layer registration, regardless of the chosen approach.

When applying adhesives between circuits and around the panel perimeter, a flow pattern compatible with the selected adhesive system can be employed. Maximizing the retention of copper improves layer registration in general.

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