Unfilled PEI sheet  has good toughness. The dielectric loss factor (tanδ) of PEI resin is very small, and it still performs excellently at high frequencies, with very stable dielectric strength.
It can achieve UL94 V-0 level without adding flame retardants, with a high oxygen index (about 47%), low smoke emission and low toxicity during combustion, ensuring extremely high safety

PEI 2300 sheet has enhanced  bending strength and higher rigidity than ultem 1000 sheet, it also has improved the load-bearing capacity  at high temperatures, and maintained good electrical insulation even with the addition of glass fiber

Glass fiber has greatly enhanced the bending strength and rigidity of PEI, improved the load-bearing capacity of PEI material at high temperatures, and maintained good electrical insulation even with the addition of glass fiber