PET: Normal or high temperature PET, PET chips and polyester chips, with melting point of about 250C, are all aggregated into transparent particles and copolymerized into milky white particles.
PETG, PCTG, modified PET or low temperature PET, copolyester, copolyester, melting point about 180C, copolymer, transparent particles.
Second, composition
PET=PTA (terephthalic acid) +EG (ethylene glycol)
PETG=PTA (terephthalic acid) +EG (ethylene glycol) +< 50%CHDM( 1, 4- cyclohexanedimethanol).
PCTG=PTA (terephthalic acid) +EG (ethylene glycol)+>; 50% CHDM( 1, 4- cyclohexanedimethanol)
It is not difficult to see from the above components that PETG/PCTG is made of PET modified by alcohol. When the alcohol content is less than 50%, PETG is formed, and when the alcohol content is more than 50%, PCTG is formed. With the increase of CHDM alcohol content, the melting point decreases, the glass transition temperature increases, and the crystallinity decreases, and then the hardness of the resin decreases, the heat resistance increases, and finally an amorphous transparent shape is formed.