Isola 370HR

370HR is a high performance 180C glass transition (Tg) 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 (E-glas) glass fabric. The system provides improved thermal performance and low expansion rates in comparison to traditional FR-4 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 fluoescing and UV blocking for maximum compatibility with Automated Optical Inspection (AOI) systems, optical positioning systems and photoimagable solder mask imaging. 370HR has proven to be best in class for sequential lamination designs.


  • High thermal performance – Tg:180C (DSC), Td:340C (TGA@5% wt loss), Low CTE for reliability
  • T260: 60 minutes
  • T288: 30 minutes
  • RoHS Compliant
  • UV Blocking and AOI Fluoescence
  • Superior Processing – Closest to conventional FR-4 processing
  • Core Material Standard Availability – Thickness 0.05mm to 3.2mm, 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 – 1/2, 1 and 2 oz (18, 35 and 70 micron) available, Heavier coper available upon request, Thinner copper foil available upon request
  • Glass Fabric Availability – Standard E-glass, Square weave glass fabric available
  • Industry Approvals – IPC-4101C/21 /24 /26 /98 /99 /126, UL- File Number E41625 as PCL-FR-370HR, Qualified to UL’s MCIL Program