Inorganic reinforcing materials are added for the
improvement of mechanical strength and heat
resistance. If the sample is heated in air using TG, this
quantity can be measured easily.
TG curve shows that decomposition starts from near
400˚C,and ends near 650˚C. During this period, PET
decomposes completely, and inorganic residue remains.
Therefore, the quantity that deducted the amount of
decomposition of PET from the amount of original
sample becomes the amount of glass fiber.
(100-65.85=34.15%)