A little bit of Material Science first:
PET is made from terephthalic acid ('TPA') and ethylene glycol ('EG') (CH2OH)2
PCT is made from terephthalic acid ('TPA') and cyclohexanedimethanol (‘CHDM’) C6H10(CH2OH)2
If you react TPA with both EG and CHDM, you get a co-polymer, called PETg or PCTg.
Usually the polymer is called PETg when the major diol is ethylene glycol (>50%) and PCTg when the major diol is CHDM (>50%).
The higher the EG content the stronger and more rigid the material, the higher the CHDM content the more ductile and impact resistant the material.
In summary:
PETG -> Strong and rigid
PCTG -> Ductile and impact resistant
Our PolyMax™ PETG is a modified PETG with enhanced fracture toughness which makes it more ductile and impact resistance.
To conclude, PolyMax™ PETG provides the best of both PETG and PCTG with high strength and rigidity as well as enhanced ductility and impact resistance.