370HR

Industry Leading Epoxy Laminate and Prepreg

370HR is the industry’s “best in class” lead-free compatible product for high-reliability applications across a wide range of markets.

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Thermal Performance

Tg: 180°C
Td: 340°C

Electrical Performance

Dk: 4.04
Df: 0.021

Industry Approvals

IPC-4101 /98 /99 /101 /126
UL - File E41625 Grade PCL-FR-370HR

370HR laminates and prepregs, deigned by Polyclad, are made using a patented high performance 180°C Tg FR-4 multifunctional epoxy resin system that is designed for multilayer Printed Wiring Board (PWB) applications where maximum thermal performance and reliability are required. We manufacture 370HR laminates and prepregs with high quality E-glass glass fabric for superior Conductive Anodic Filament (CAF) resistance. 370HR provides superior thermal performance with low Coefficient of Thermal Expansion (CTE) and the mechanical, chemical and moisture resistance properties that equal or exceed the performance of traditional FR-4 materials.

370HR is used in thousands of PWB designs and has proven to be best in class for thermal reliability, CAF performance, ease of processing and proven performance on sequential lamination designs.

Attributes

HighThermalReliability High Density Interconnect

Markets

ComputingStoragePeripherals ConsumerElectronics NetworkingCommunications AerospaceDefense MedicalIndustrialInstrumentation AutomotiveTransportation

Product Features

  • Industry Recognition
    • UL File Number: E41625
    • Polyclad®Grade PCL-FR-370HR
    • Qualified to UL’s MCIL Program
    • RoHS Compliant
  • Performance Attributes
    • CAF resistant
  • Processing Advantages
    • FR-4 process compatible
    • UV blocking and AOI fluorescence
    • Multiple reflow capable
    • HDI technology compatible

Production & Manufacturing

Currently manufactured in Asia, North America, Europe

Product Availability

  • Standard Material Offering: Laminate
    • 2 to 125 mil (0.05 to 3.2 mm)
  • Copper Foil Type
    • HTE Grade 3
    • RTF (Reverse Treat Foil)
    • Embedded resistor foil
  • Copper Weight
    • ½, 1 and 2 oz (18, 35 and 70 µm) available
    • Heavier copper foil available
    • Thinner copper foil available
  • Standard Material Offering: Prepreg
    • Tooling of prepreg panels
  • Glass Fabric Availability
    • E-glass
    • Square weave glass
    • Mechanically spread glass
Property Typical Value Units Test Method
Metric (English) IPC-TM-650 (or as noted)
Glass Transition Temperature (Tg) by DSC 180 °C 2.4.25C
Decomposition Temperature (Td) by TGA @ 5% weight loss 340 °C 2.4.24.6
Time to Delaminate by TMA (Copper removed)
A. T260
B. T288
60
30
 Minutes 2.4.24.1
Z-Axis CTE
A. Pre-Tg
B. Post-Tg
C. 50 to 260°C, (Total Expansion)
45
230
2.8
ppm/°C
ppm/°C
%
 2.4.24C
X/Y-Axis CTE Pre-Tg 13/14 ppm/°C 2.4.24C
Thermal Conductivity 0.4 W/m·K ASTM E1952
Thermal Stress 10 sec @ 288ºC (550.4ºF)
A. Unetched
B. Etched
 Pass Pass Visual 2.4.13.1
Dk, Permittivity
A. @ 100 MHz
B. @ 1 GHz
C. @ 2 GHz
D. @ 5 GHz
E. @ 10 GHz
4.24
4.17
4.04
3.92
3.92
 —
2.5.5.3
2.5.5.9
Bereskin Stripline
Bereskin Stripline
Bereskin Stripline
Df, Loss Tangent
A. @ 100 MHz
B. @ 1 GHz
C. @ 2 GHz
D. @ 5 GHz
E. @ 10 GHz
0.0150
0.0161
0.0210
0.0250
0.0250
—
—
—
2.5.5.3
2.5.5.9
Bereskin Stripline
2.5.5.5
2.5.5.5
Volume Resistivity
A. After moisture resistance
B. At elevated temperature
3.0 x 108
7.0 x 108
 MΩ-cm 2.5.17.1
Surface Resistivity
A. After moisture resistance
B. At elevated temperature
3.0 x 106
2.0 x 108
 MΩ 2.5.17.1
Dielectric Breakdown >50 kV 2.5.6B
Arc Resistance 115 Seconds 2.5.1B
Electric Strength (Laminate & laminated prepreg) 54 (1350) kV/mm (V/mil) 2.5.6.2A
Comparative Tracking Index (CTI) 3 (175-249) Class (Volts) UL 746A
ASTM D3638
Peel Strength
A. Low profile copper foil and very low profile copper foil all copper foil >17 μm [0.669 mil]
B. Standard profile copper
    1. After thermal stress
    2. At 125ºC (257ºF)
    3. After process solutions

1.14 (6.5)

1.25 (7.0)
1.25 (7.0)
1.14 (6.5)
 N/mm (lb/inch)
2.4.8C

2.4.8.2A
2.4.8.3
2.4.8.3
Flexural Strength
A. Length direction
B. Cross direction
620 (90.0)
531 (77.0)
 MPa (kpsi) 2.4.4B
Tensile Strength
A. Length direction
B. Cross direction
385 (55.9)
245 (35.6)
 MPa (kpsi) ASTM D3039
Young's Modulus
A. Length direction
B. Cross direction
3744
3178
 ksi ASTM D790-15e2
Poisson's Ratio
A. Length direction
B. Cross direction
0.177
0.171
 — ASTM D3039
Moisture Absorption 0.15 % 2.6.2.1A
Flammability (Laminate & laminated prepreg) V-0 Rating UL 94
Relative Thermal Index (RTI) 130 °C UL 796
The data, while believed to be accurate and based on analytical methods considered to be reliable, is for information purposes only. Any sales of these products will be governed by the terms and conditions of the agreement under which they are sold.

NOTE

Visit our site http://www.isola-group.com for more details.
Revisions:
A: Initial release - 4/17
B: Corrected units for Flexural and Tensile Strength - 8/18
C: Change MOT to RTI 5/19
D: Changed VLP2 to HVLP to align with common industry terms 4/21
E: Corrected Lengthwise Flexural strength value typo from 6201 to 620 - 6/24

Download Dk/Df Tables PDF

Core Data

Constructions Resin Content % Offering Thickness (inch) Thickness (mm) Dielectric Constant (DK)/ Dissipation Factor (DF)
100 MHz 500 MHz 1 GHz 2 GHz 5 GHz 10 GHz
1x106 71.0% Standard 0.0020 0.051 3.89
0.0180		 3.84
0.0210		 3.81
0.0240		 3.77
0.0250		 3.63
0.0300		 3.63
0.0300
1x1067 65.0% Alternate 0.0020 0.051 3.99
0.0170		 3.94
0.0200		 3.91
0.0220		 3.88
0.0230		 3.74
0.0280		 3.74
0.0280
1x1080 58.0% Standard 0.0025 0.064 4.11
0.0160		 4.06
0.0180		 4.04
0.0210		 4.00
0.0220		 3.88
0.0260		 3.88
0.0260
1x1080 66.0% Standard 0.0030 0.076 4.09
0.0160		 4.04
0.0180		 4.02
0.0210		 3.99
0.0220		 3.86
0.0260		 3.86
0.0260
1x2113 46.0% Alternate 0.0030 0.076 4.34
0.0140		 4.30
0.0160		 4.28
0.0180		 4.25
0.0190		 4.14
0.0220		 4.14
0.0220
1x1086 60.0% Alternate 0.0030 0.076 4.07
0.0160		 4.02
0.0190		 4.00
0.0210		 3.97
0.0220		 3.84
0.0260		 3.84
0.0260
1x2113 54.0% Standard 0.0035 0.089 4.18
0.0160		 4.14
0.0170		 4.11
0.0200		 4.08
0.0210		 3.96
0.0240		 3.96
0.0240
1x3313 51.0% Alternate 0.0035 0.089 4.24
0.0150		 4.19
0.0170		 4.17
0.0190		 4.14
0.0200		 4.03
0.0230		 4.03
0.0230
2x106 68.0% Standard 0.0035 0.089 3.94
0.0180		 3.89
0.0200		 3.86
0.0230		 3.82
0.0240		 3.68
0.0290		 3.68
0.0290
1x2116 47.0% Standard 0.0040 0.102 4.32
0.0140		 4.27
0.0160		 4.26
0.0180		 4.23
0.0190		 4.17
0.0220		 4.17
0.0220
1x106/1x1080 60.0% Standard 0.0040 0.102 4.07
0.0160		 4.02
0.0190		 4.00
0.0210		 3.97
0.0220		 3.84
0.0260		 3.84
0.0260
1x106/1x1080 62.0% Alternate 0.0043 0.109 4.04
0.0170		 3.99
0.0190		 3.97
0.0220		 3.93
0.0230		 3.80
0.0270		 3.80
0.0270
1x2116 51.0% Standard 0.0045 0.114 4.24
0.0150		 4.19
0.0170		 4.17
0.0190		 4.14
0.0200		 4.03
0.0230		 4.03
0.0230
2x1080 55.0% Standard 0.0045 0.114 4.16
0.0160		 4.12
0.0180		 4.10
0.0200		 4.05
0.0210		 3.99
0.0240		 3.99
0.0250
1x2116 54.0% Standard 0.0050 0.127 4.18
0.0150		 4.14
0.0170		 4.11
0.0200		 4.08
0.0210		 3.96
0.0240		 3.96
0.0240
1x1652 43.0% Alternate 0.0050 0.127 4.40
0.0140		 4.36
0.0150		 4.34
0.0170		 4.32
0.0180		 4.21
0.0210		 4.21
0.0210
2x1080 58.0% Standard 0.0050 0.127 4.11
0.0160		 4.06
0.0180		 4.04
0.0210		 4.00
0.0220		 3.88
0.0260		 3.88
0.0260
1x106/1x2113 57.0% Alternate 0.0053 0.135 4.13
0.0160		 4.08
0.0180		 4.06
0.0210		 4.02
0.0210		 3.90
0.0250		 3.90
0.0250
1x1652 46.0% Alternate 0.0055 0.140 4.34
0.0140		 4.30
0.0160		 4.28
0.0180		 4.25
0.0190		 4.14
0.0220		 4.14
0.0220
2x1080 65.0% Standard 0.0060 0.152 4.09
0.0160		 4.04
0.0180		 4.02
0.0210		 3.99
0.0220		 3.86
0.0260		 3.86
0.0260
1x1652 51.0% Standard 0.0060 0.152 4.24
0.0150		 4.19
0.0170		 4.17
0.0190		 4.14
0.0200		 4.03
0.0230		 4.03
0.0230
2x1086 59.0% Alternate 0.0060 0.152 4.09
0.0160		 4.04
0.0180		 4.02
0.0210		 3.99
0.0220		 3.86
0.0260		 3.86
0.0260
1x7628 42.0% Standard 0.0070 0.178 4.42
0.0140		 4.38
0.0150		 4.36
0.0170		 4.34
0.0180		 4.24
0.0200		 4.24
0.0200
2x2113 54.0% Standard 0.0070 0.178 4.18
0.0160		 4.14
0.0170		 4.11
0.0200		 4.08
0.0210		 3.96
0.0240		 3.96
0.0240
2x3313 51.0% Alternate 0.0070 0.178 4.24
0.0150		 4.19
0.0170		 4.17
0.0190		 4.14
0.0200		 4.03
0.0230		 4.03
0.0230
1x7628 44.0% Alternate 0.0075 0.191 4.38
0.0140		 4.34
0.0150		 4.32
0.0170		 4.29
0.0180		 4.19
0.0210		 4.19
0.0210
2x2116 47.0% Standard 0.0080 0.203 4.32
0.0140		 4.27
0.0160		 4.26
0.0180		 4.23
0.0190		 4.17
0.0220		 4.17
0.0220
2x3313 55.0% Alternate 0.0080 0.203 4.16
0.0160		 4.12
0.0180		 4.10
0.0200		 4.05
0.0210		 3.99
0.0240		 3.99
0.0250
1x7628 46.0% Standard 0.0080 0.203 4.34
0.0140		 4.30
0.0160		 4.28
0.0180		 4.25
0.0190		 4.14
0.0220		 4.14
0.0220
2x2116 51.0% Alternate 0.0090 0.229 4.24
0.0150		 4.19
0.0170		 4.17
0.0190		 4.14
0.0200		 4.03
0.0230		 4.03
0.0230
2x2116 54.0% Standard 0.0100 0.254 4.18
0.0160		 4.14
0.0170		 4.11
0.0200		 4.08
0.0210		 3.96
0.0240		 3.96
0.0240
2x1652 43.0% Alternate 0.0100 0.254 4.40
0.0140		 4.36
0.0150		 4.34
0.0170		 4.32
0.0180		 4.21
0.0210		 4.21
0.0210
2x1652 51.0% Standard 0.0120 0.305 4.24
0.0150		 4.19
0.0170		 4.17
0.0190		 4.14
0.0200		 4.03
0.0230		 4.03
0.0230
2x1080/1x7628 48.0% Alternate 0.0120 0.305 4.30
0.0150		 4.25
0.0160		 4.24
0.0180		 4.21
0.0190		 4.09
0.0220		 4.09
0.0220
2x7628 42.0% Standard 0.0140 0.356 4.42
0.0140		 4.38
0.0150		 4.36
0.0170		 4.34
0.0180		 4.24
0.0200		 4.24
0.0200
2x7628 46.0% Standard 0.0160 0.406 4.34
0.0140		 4.30
0.0160		 4.28
0.0180		 4.25
0.0190		 4.14
0.0220		 4.14
0.0220
1x1080/2x7628 41.0% Alternate 0.0180 0.457 4.44
0.0130		 4.40
0.0140		 4.39
0.0170		 4.36
0.0170		 4.26
0.0200		 4.26
0.0200
2x7628/1x2116 45.0% Standard 0.0180 0.457 4.36
0.0140		 4.32
0.0160		 4.30
0.0180		 4.27
0.0190		 4.15
0.0210		 4.15
0.0210
3x7628 42.0% Standard 0.0210 0.533 4.42
0.0140		 4.38
0.0150		 4.36
0.0170		 4.34
0.0180		 4.24
0.0200		 4.24
0.0200
3x7628 46.0% Standard 0.0240 0.610 4.34
0.0140		 4.30
0.0160		 4.28
0.0180		 4.25
0.0190		 4.14
0.0220		 4.14
0.0220
4x7628 42.0% Standard 0.0280 0.711 4.42
0.0140		 4.38
0.0150		 4.36
0.0170		 4.34
0.0180		 4.24
0.0200		 4.24
0.0200
4x7628/1x1080 44.0% Standard 0.0310 0.787 4.38
0.0140		 4.34
0.0150		 4.32
0.0170		 4.30
0.0180		 4.19
0.0210		 4.19
0.0210
5x7628 42.0% Alternate 0.0350 0.889 4.42
0.0140		 4.38
0.0150		 4.36
0.0170		 4.34
0.0180		 4.24
0.0200		 4.24
0.0200
5x7628/1x2116 43.0% Alternate 0.0390 0.991 4.40
0.0140		 4.36
0.0150		 4.34
0.0170		 4.34
0.0180		 4.24
0.0200		 4.24
0.0200
6x7628 42.0% Alternate 0.0420 1.067 4.42
0.0140		 4.38
0.0150		 4.36
0.0170		 4.34
0.0180		 4.24
0.0200		 4.24
0.0200

Prepreg Data

Construction Resin Content % Offering Thickness (inch) Thickness (mm) Dielectric Constant (DK)/ Dissipation Factor (DF)
100 MHz 500 MHz 1 GHz 2 GHz 5 GHz 10 GHz
106 71.0% Alternate 0.0020 0.051 3.89
0.0160		 3.83
0.0180		 3.81
0.0200		 3.77
0.0210		 3.63
0.0240		 3.63
0.0250
1067 70.0% Alternate 0.0023 0.058 3.91
0.0180		 3.85
0.0200		 3.83
0.0240		 3.79
0.0250		 3.65
0.0290		 3.65
0.0290
106 76.0% Standard 0.0024 0.061 3.81
0.0190		 3.75
0.0220		 3.73
0.0250		 3.69
0.0260		 3.54
0.0310		 3.54
0.0310
1067 75.0% Alternate 0.0027 0.069 3.83
0.0190		 3.77
0.0210		 3.75
0.0250		 3.71
0.0260		 3.56
0.0310		 3.56
0.0310
1080 61.0% Alternate 0.0028 0.070 4.03
0.0160		 3.96
0.0180		 3.92
0.0200		 3.92
0.0210		 3.79
0.0250		 3.80
0.0250
1080 66.0% Standard 0.0030 0.076 3.97
0.0170		 3.92
0.0200		 3.90
0.0230		 3.86
0.0240		 3.72
0.0280		 3.72
0.0280
1086 63.0% Alternate 0.0031 0.079 4.02
0.0170		 3.95
0.0190		 3.91
0.0220		 3.91
0.0230		 3.78
0.0270		 3.78
0.0270
1080 68.0% Standard 0.0032 0.081 3.94
0.0180		 3.89
0.0200		 3.86
0.0230		 3.82
0.0240		 3.68
0.0290		 3.68
0.0290
1086 65.0% Alternate 0.0033 0.084 3.99
0.0170		 3.94
0.0200		 3.92
0.0220		 3.88
0.0230		 3.75
0.0280		 3.74
0.0280
1086 67.0% Alternate 0.0035 0.089 3.96
0.0180		 3.90
0.0200		 3.88
0.0230		 3.84
0.0240		 3.70
0.0280		 3.70
0.0280
1080 71.0% Standard 0.0036 0.091 3.89
0.0180		 3.83
0.0210		 3.81
0.0240		 3.77
0.0250		 3.63
0.0300		 3.63
0.0300
2113 55.0% Alternate 0.0039 0.098 4.16
0.0160		 4.12
0.0180		 4.10
0.0200		 4.06
0.0210		 3.95
0.0240		 3.95
0.0250
3313 55.0% Standard 0.0038 0.097 4.16
0.0160		 4.12
0.0180		 4.10
0.0200		 4.06
0.0210		 3.95
0.0240		 3.95
0.0250
2113 59.0% Standard 0.0040 0.102 4.09
0.0160		 4.04
0.0180		 4.02
0.0210		 3.99
0.0220		 3.86
0.0260		 3.86
0.0260
2116 52.0% Alternate 0.0047 0.119 4.22
0.0160		 4.17
0.0180		 4.15
0.0200		 4.12
0.0210		 4.01
0.0250		 4.01
0.0250
2116 56.0% Standard 0.0048 0.122 4.14
0.0160		 4.10
0.0180		 4.08
0.0200		 4.04
0.0210		 3.92
0.0240		 3.92
0.0250
1652 51.0% Standard 0.0057 0.145 4.24
0.0150		 4.19
0.0170		 4.17
0.0190		 4.14
0.0200		 4.03
0.0230		 4.03
0.0230
7628 45.0% Standard 0.0073 0.185 4.36
0.0140		 4.32
0.0160		 4.30
0.0180		 4.27
0.0180		 4.16
0.0210		 4.16
0.0210
7628 50.0% Standard 0.0082 0.208 4.26
0.0150		 4.21
0.0170		 4.19
0.0190		 4.16
0.0200		 4.05
0.0230		 4.05
0.0230

NOTE

Revisions:
A - Original - 4/17
B - Added Standard & Alternate construction, Corrected 106 76% RC and 1067 70% RC prepreg thickness values - 8/18
C - Corrected 18 mil construction and 5 Ghz typo in prepreg table - 1/20
D - Remove 1x2113 55% 4 mil - 7/20
E - Added 3313 59% RC prepreg, Removed weave type- 9/20
F - Corrected 2x1080 6 mil core RC% from 59% to 65% - 6/23

All 370HR glass is Spread Weave in both directions

Resources

Making Sense of Laminate Dielectric Properties

This paper highlights the critical selection factors that go beyond a typical product data sheet and explains how these factors must be considered when selecting materials for high speed applications.

Conductive Anodic Filament Growth Failure

This paper provides describes Isola's work in finding the right combination of process and design conditions for improved CAF resistant products.

Laminate & Prepreg Manufacturing

This presentation describes the process of laminate and prepreg manufacturing.

PCB Material Selection for High-speed Digital Designs

This presentation describes PCB factors that limit high-speed digital performance and the PCB material selection process and Isola product solutions.

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