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FR4 Isola 370hr PCB is a PCB made of high performance 180 ° C glass transition temperature (TG) FR-4 system, which is suitable for multilayer printed circuit board (PWB) applications requiring maximum thermal performance and reliability. The 370hr laminate and prepreg products are made from a unique high-performance multifunctional epoxy resin reinforced with electronic grade (E-glass) glass fiber fabric.

fr4 Isola 370HR PCB
fr4 Isola 370HR PCB

Compared with the traditional FR-4, the system provides improved thermal performance and lower expansion rate, while maintaining the processability of FR-4. In addition to this superior thermal performance, its mechanical, chemical and moisture resistance are equal to or better than the traditional FR-4 materials.

The 370hr system also has laser fluorescence and UV blocking functions, which can achieve maximum compatibility with automatic optical inspection (AOI) system, optical positioning system and optical imaging solder mask imaging. 370hr has been proved to be the best product design in the field of sequential bonding.

370hr is the “best in class” lead-free compatible product in the industry

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

370HR laminates and prepregs are made employing a patented high performance 180°C Tg FR-4 multi-functional epoxy system that’s designed for multi-layer Printed Wiring Board (PWB) applications where maximum thermal performance, reliability superior CAF resistance are required. this technique provides superior thermal performance with low Coefficient of Thermal Expansion (CTE) and therefore the mechanical, chemical and moisture resistance properties that equal or exceed the performance of traditional FR-4 materials.

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

According to a Boston University report on Isola 370HR PCB, 370HR is a high performance 180°C glass transition temperature (Tg) FR-4 system for multilayer printed wiring board (PWB) applications where maximum thermal performance and reliability are required . 370HR laminate and prepreg products are manufactured with a unique high performance multifunctional epoxy resin, reinforced with electrical grade (Eglass) glass fabric. This system provides improved thermal performance and low expansion rates in comparison to traditional FR4 while retaining FR-4 processability. In addition to this superior thermal performance the mechanical, chemical and moisture resistance properties all equal or exceed the performance of traditional FR-4 materials. The 370HR system is also laser fluorescing and UV blocking for maximum compatibility with automated optical inspection systems (AOI), optical positioning systems and photoimagable soldermask imaging.

Isola 370HR PCB
Boston University

FR4 Isola 370HR PCB Features:

High Thermal Performance
Tg: 180°C (DSC)
Td: 340°C (TGA @ 5% wt loss)
Low CTE for reliability
T260: 60 minutes
T288: 30 minutes
• RoHS Compliant

UV Blocking and AOI Fluorescence
High throughput and accuracy during PCB
fabrication and assembly
CAF Resistant
• Superior Processing
Closest to conventional FR-4 processing
Core Material Standard Availability
Thickness: 0.002″ (0.05 mm) to 0.125″
(3.2 mm)
Available in full size sheet or panel form
Prepreg Standard Availability
Roll or panel form
Tooling of prepreg panels available
Copper Foil Type Availability
Standard HTE Grade 3
RTF (Reverse Treat Foil)
Copper Weights
½, 1 and 2 oz (18, 35 and 70 µm) available
Heavier copper available upon request
Thinner copper foil available upon request
Glass Fabric Availability
Standard E-glass
Square weave glass fabric available
Spread glass fabric available
Industry Approvals
IPC-4101D WAM1 /98 /99 /101 /126
(IPC-4101C /21 /24 /26 /97 /98 /99 /101 /126)
UL – File Number E41625 as PCL-FR-370HR
Qualified to UL’s MCIL Program

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