370HR

High Performance Laminate and Prepreg

Download Data Sheet

Thermal PerformanceElectrical PerformanceIndustry Approvals
Tg
180°C
Td
340°C
Dk
4.04
Df
0.0210
IPC-4101 /101 /98 /99 /126
UL - File Number E41625
370HR is the industry’s “best in class” lead-free compatible product for high-reliability applications across a wide range of markets.

370HR laminates and prepregs are made using a patented high performance 180°C Tg FR-4 multi-functional epoxy resin system that is designed for multi-layer Printed Wiring Board (PWB) applications where maximum thermal performance, reliability  superior CAF resistance are required.  This system 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.

Product Features

  • Industry Recognition
    • UL File Number: E41625
    • Qualified to UL’s MCIL Program
    • RoHS Compliant
  • Performance Attributes
    • CAF resistant
    • Lead-free assembly compatible
  • Processing Advantages
    • FR-4 process compatible
    • UV blocking and AOI fluorescence

Product Availability

  • Standard Material Offering: Laminate
    • 2 to 125 mil (0.05 to 3.2 mm)
    • Available in full size sheet or panel form
  • Copper Foil Type
    • HTE Grade 3
    • RTF (Reverse Treat Foil)
  • Copper Weight
    • ½ to 2 oz (18 to 70 µm) available
    • Heavier copper available
    • Thinner copper foil available
  • Standard Material Offering: Prepreg
    • Roll or panel form
    • Tooling of prepreg panels
  • Glass Fabric Availability
    • E-glass
    • Square weave glass
    • Mechanically spread glass

Production & Manufacturing

  • Currently manufactured in Asia, North America, Europe
PropertyTypical ValueUnitsTest Method
Metric (English)IPC-TM-650 (or as noted)
Glass Transition Temperature (Tg) by DSC180°C2.4.25C
Decomposition Temperature (Td) by TGA @ 5% weight loss340°C2.4.24.6
Time to Delaminate by TMA (Copper removed)
A. T260
B. T288
60
30
Minutes2.4.24.1
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 CTEPre-Tg13/14ppm/°C2.4.24C
Thermal ConductivityW/mKASTM E1952
Thermal Stress 10 sec @ 288ºC (550.4ºF)
A. Unetched
B. Etched
PassPass Visual2.4.13.1
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-cm2.5.17.1
Surface Resistivity
A. After moisture resistance
B. At elevated temperature
3.0 x 106
2.0 x 108
2.5.17.1
Dielectric Breakdown>50kV2.5.6B
Arc Resistance115Seconds2.5.1B
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
90.0
77.0
ksi2.4.4B
Tensile Strength
A. Length direction
B. Cross direction
55.9
35.6
ksiASTM D3039
Young's Modulus
A. Length direction
B. Cross direction
3744
3178
ksiASTM D790-15e2
Poisson's Ratio
A. Length direction
B. Cross direction
0.177
0.171
ASTM D3039
Moisture Absorption0.15%2.6.2.1A
Flammability (Laminate & laminated prepreg)V-0RatingUL 94
Max Operating Temperature130°CUL 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 https://www.isola-group.com for more details.
Revision B: Corrected units for Flexural and Tensile Strength

Core Data

ConstructionsResin Content %Standard/AlternateThickness (inch)Thickness (mm)Dielectric Constant (DK) / Dissipation Factor (DF)
100 MHz500 MHz1 GHz2 GHz5 GHz10 GHz
1x10671.0%Standard0.0020.051
3.89
0.0181
3.84
0.021
3.81
0.024
3.77
0.025
3.63
0.03
3.63
0.03
1x106765.0%Alternate0.0020.051
3.99
0.0172
3.94
0.02
3.91
0.022
3.88
0.023
3.74
0.028
3.74
0.028
1x108058.0%Standard0.00250.064
4.11
0.0161
4.06
0.018
4.04
0.021
4.00
0.022
3.88
0.026
3.88
0.026
1x108059.0%Standard0.0030.076
4.09
0.0163
4.04
0.018
4.02
0.021
3.99
0.022
3.86
0.026
3.86
0.026
1x211346.0%Alternate0.0030.076
4.34
0.0142
4.30
0.016
4.28
0.018
4.25
0.019
4.14
0.022
4.14
0.022
1x108660.0%Alternate0.0030.076
4.07
0.0164
4.02
0.019
4.00
0.021
3.97
0.022
3.84
0.026
3.84
0.026
1x211354.0%Standard0.00350.089
4.18
0.0155
4.14
0.017
4.11
0.02
4.08
0.021
3.96
0.024
3.96
0.024
1x331351.0%Alternate0.00350.089
4.24
0.015
4.19
0.017
4.17
0.019
4.14
0.02
4.03
0.023
4.03
0.023
2x10668.0%Standard0.00350.089
3.94
0.0177
3.89
0.02
3.86
0.023
3.82
0.024
3.68
0.029
3.68
0.029
1x211647.0%Standard0.0040.102
4.32
0.0144
4.27
0.016
4.26
0.018
4.23
0.019
4.17
0.022
4.17
0.022
1x211355.0%Alternate0.0040.102
4.16
0.0156
4.12
0.018
4.10
0.02
4.05
0.021
3.99
0.244
3.99
0.025
1x106/1x108060.0%Standard0.0040.102
4.07
0.0164
4.02
0.019
4.00
0.021
3.97
0.022
3.84
0.026
3.84
0.026
1x106/1x108062.0%Alternate0.00430.109
4.04
0.0167
3.99
0.019
3.97
0.022
3.93
0.023
3.80
0.027
3.80
0.027
1x211651.0%Standard0.00450.114
4.24
0.015
4.19
0.017
4.17
0.019
4.14
0.02
4.03
0.023
4.03
0.023
2x108055.0%Standard0.00450.114
4.16
0.0156
4.12
0.018
4.10
0.02
4.05
0.021
3.99
0.244
3.99
0.025
1x211654.0%Standard0.0050.127
4.18
0.0154
4.14
0.017
4.11
0.02
4.08
0.021
3.96
0.024
3.96
0.024
1x165243.0%Alternate0.0050.127
4.40
0.0137
4.36
0.015
4.34
0.017
4.32
0.018
4.21
0.021
4.21
0.021
2x108058.0%Standard0.0050.127
4.11
0.0161
4.06
0.018
4.04
0.021
4.00
0.022
3.88
0.026
3.88
0.026
1x106/1x211357.0%Alternate0.00530.135
4.13
0.016
4.08
0.018
4.06
0.021
4.02
0.021
3.90
0.025
3.90
0.025
1x165246.0%Alternate0.00550.14
4.34
0.0142
4.30
0.016
4.28
0.018
4.25
0.019
4.14
0.022
4.14
0.022
2x108059.0%Standard0.0060.152
4.09
0.0163
4.04
0.018
4.02
0.021
3.99
0.022
3.86
0.026
3.86
0.026
1x165251.0%Standard0.0060.152
4.24
0.015
4.19
0.017
4.17
0.019
4.14
0.02
4.03
0.023
4.03
0.023
2x108659.0%Alternate0.0060.152
4.09
0.0163
4.04
0.018
4.02
0.021
3.99
0.022
3.86
0.026
3.86
0.026
1x762842.0%Standard0.0070.178
4.42
0.0136
4.38
0.015
4.36
0.017
4.34
0.018
4.24
0.02
4.24
0.02
2x211354.0%Standard0.0070.178
4.18
0.0155
4.14
0.017
4.11
0.02
4.08
0.021
3.96
0.024
3.96
0.024
2x331351.0%Alternate0.0070.178
4.24
0.015
4.19
0.017
4.17
0.019
4.14
0.02
4.03
0.023
4.03
0.023
1x762844.0%Alternate0.00750.191
4.38
0.0139
4.34
0.015
4.32
0.017
4.29
0.018
4.19
0.021
4.19
0.021
2x211647.0%Standard0.0080.203
4.32
0.0144
4.27
0.016
4.26
0.018
4.23
0.019
4.17
0.022
4.17
0.022
2x331355.0%Alternate0.0080.203
4.16
0.0156
4.12
0.018
4.10
0.02
4.05
0.021
3.99
0.244
3.99
0.025
1x762846.0%Standard0.0080.203
4.34
0.0142
4.30
0.016
4.28
0.018
4.25
0.019
4.14
0.022
4.14
0.022
2x211651.0%Alternate0.0090.229
4.24
0.015
4.19
0.017
4.17
0.019
4.14
0.02
4.03
0.023
4.03
0.023
2x211654.0%Standard0.010.254
4.18
0.0155
4.14
0.017
4.11
0.02
4.08
0.021
3.96
0.024
3.96
0.024
2x165243.0%Alternate0.010.254
4.40
0.0137
4.36
0.015
4.34
0.017
4.32
0.018
4.21
0.021
4.21
0.021
2x165251.0%Standard0.0120.305
4.24
0.015
4.19
0.017
4.17
0.019
4.14
0.02
4.03
0.023
4.03
0.023
2x1080/1x762848.0%Alternate0.0120.305
4.30
0.0145
4.25
0.016
4.24
0.018
4.21
0.019
4.09
0.022
4.09
0.022
2x762842.0%Standard0.0140.356
4.42
0.0136
4.38
0.015
4.36
0.017
4.34
0.018
4.24
0.02
4.24
0.02
2x762846.0%Standard0.0160.406
4.34
0.0142
4.30
0.016
4.28
0.018
4.25
0.019
4.14
0.022
4.14
0.022
2x1080/1x762841.0%Alternate0.0180.457
4.44
0.0134
4.40
0.014
4.39
0.017
4.36
0.017
4.26
0.02
4.26
0.02
2x7628/1x211645.0%Standard0.0180.457
4.36
0.0141
4.32
0.016
4.30
0.018
4.27
0.019
4.15
0.021
4.15
0.021
3x762842.0%Standard0.0210.533
4.42
0.0136
4.38
0.015
4.36
0.017
4.34
0.018
4.24
0.02
4.24
0.02
3x762846.0%Standard0.0240.61
4.34
0.0142
4.30
0.016
4.28
0.018
4.25
0.019
4.14
0.022
4.14
0.022
4x762842.0%Standard0.0280.711
4.42
0.0136
4.38
0.015
4.36
0.017
4.34
0.018
4.24
0.02
4.24
0.02
4x7628/1x108044.0%Standard0.0310.787
4.38
0.0139
4.34
0.015
4.32
0.017
4.30
0.018
4.19
0.021
4.19
0.021
5x762842.0%Alternate0.0350.889
4.42
0.0136
4.38
0.015
4.36
0.017
4.34
0.018
4.24
0.02
4.24
0.02
5x7628/1x211643.0%Alternate0.0390.991
4.40
0.0137
4.36
0.015
4.34
0.017
4.34
0.018
4.24
0.02
4.24
0.02
6x762842.0%Alternate0.0421.067
4.42
0.0136
4.38
0.015
4.36
0.017
4.34
0.018
4.24
0.02
4.24
0.02

Prepreg Data

ConstructionResin Content %Standard/AlternateThickness (inch)Thickness (mm)Dielectric Constant (DK) / Dissipation Factor (DF)
100 MHz500 MHz1 GHz2 GHz5 GHz10 GHz
106770.00%Alt/Spread0.00230.058
3.91
0.018
3.85
0.0204
3.83
0.0236
3.79
0.0246
3.65
0.0293
3.65
0.0294
10676.00%Standard0.00240.061
3.81
0.0188
3.75
0.0216
3.73
0.025
3.69
0.0261
3.54
0.0313
3.54
0.0313
106775.00%Alt/Spread0.00270.069
3.83
0.0187
3.77
0.0214
3.75
0.0247
3.71
0.0259
3.56
0.031
3.56
0.031
108066.00%Standard0.0030.076
3.97
0.0173
3.92
0.0197
3.90
0.0226
3.86
0.0235
3.72
0.028
3.72
0.028
108663.00%Alt/Spread0.00310.079
4.02
0.0169
3.95
0.0191
3.91
0.0219
3.91
0.0229
3.78
0.027
3.78
0.0271
108068.00%Standard0.00320.081
3.94
0.0177
3.89
0.02
3.86
0.0231
3.82
0.024
3.68
0.029
3.68
0.029
108665.00%Alt/Spread0.00330.084
3.99
0.0172
3.94
0.0195
3.92
0.0224
3.88
0.0234
3.75
0.0276
3.74
0.0276
108667.00%Alt/Spread0.00350.089
3.96
0.0175
3.90
0.0199
3.88
0.0229
3.84
0.0237
3.70
0.0283
3.70
0.0284
108071.00%Standard0.00360.091
3.89
0.0181
3.83
0.0206
3.81
0.0238
3.77
0.025
3.63
0.0296
3.63
0.0296
331355.00%Standard0.00380.097
4.16
0.0156
4.12
0.0176
4.10
0.0201
4.06
0.0209
3.95
0.0244
3.95
0.0245
211359.00%Standard0.0040.102
4.09
0.0163
4.04
0.0183
4.02
0.021
3.99
0.022
3.86
0.026
3.86
0.026
211656.00%Standard0.00480.122
4.14
0.0158
4.10
0.0178
4.08
0.0203
4.04
0.021
3.92
0.025
3.92
0.025
165251.00%Standard0.00570.145
4.24
0.015
4.19
0.0168
4.17
0.0191
4.14
0.02
4.03
0.023
4.03
0.023
762845.00%Standard0.00730.185
4.36
0.0141
4.32
0.0156
4.30
0.0177
4.27
0.018
4.16
0.021
4.16
0.021
762850.00%Standard0.00820.208
4.26
0.0149
4.21
0.0166
4.19
0.0189
4.16
0.0196
4.05
0.0228
4.05
0.0229
NOTE
Revision B: Corrected 106 76% RC and 1067 70% RC prepreg thickness values
12/06/2017
07/30/2013

Webinars, Videos & Articles

Making Sense of Laminate Dielectric Properties (Technical Paper)

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 (Technical Paper)

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 (Presentation)

This presentation describes the process of laminate and prepreg manufacturing.

PCB Material Selection for High-speed Digital Designs (Presentation)

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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