A polyester composition is disclosed that is particularly suitable for filament. Petg (polyethylene terephthalate glycol modified) is a thermoplastic polyester that provides excellent clarity, durability, high chemical resistance, and is easy to form and fabricate. The resulting molecular structure is irregular and the material is clear and amorphous with a glass transition temperature of 88 c and melting temperature of 290 c.
Patent US6623853 Polyethylene glycol modified polyester
The composition is formed of polyethylene terephthalate;
Black blue dark gray green red white yellow polyethylene terephthalate glycol modified (petg) filament provides the resilience of acrylonitrile butadiene styrene (abs) with some features of polylactic acid (pla) material allowing for a better print from your 3d printer.
A full bar means this is the highest value in the relevant set. Petg (or copolyesters) are glycol modified pets; The graph bars on the material properties cards below compare petg to: Petg is made from pet and glycol.
Two monomers, modified ethylene glycol and purified terephthalic acid are combined to form the polymer called polyethylene terephthalate.
Polyester plastics (top), all thermoplastics (middle), and the entire database (bottom). Goex is a leader among petg plastic sheet suppliers and offers petg sheet and roll stock options customized to meet the specific needs of each application. Poly(ethylene terephthalate) glycol (petg) 16a refers to copolyesters based on terephthalic acid and ethylene glycol that are copolymerized or modified with up to 50 mol.% of another glycol (the ‘g’ in petg). Petg is the perfect filament to combine strength and ductility, which is why it’s used in so many mechanical parts and robotics.
It has stronger impact strength than acrylic but has a lower melting/forming temperature and is more easily scratched.
You can modify the plastic properties by adding another glycol such as cyclohexane dimethanol in place of ethylene. Offers high transparency, chemical resistance, moldability and flow, superior. It is melted and pushed through a hot end nozzle, typically either brass or hardened steel, at about 230 degrees c. Pet is the most widely recycled plastic in the world.
Polyethylene terephthalate glycol modified iso test property values physical iso1183 speci˜c gravity (g/cm3) 1.27 mechanical iso178 tensile strength (mpa) 26.20 iso527 elongation at break (%) at 3 mm thickness 54 at 2 mm thickness 210 iso178 flexural strength (mpa) 77 iso178 flexural modulus (mpa) 3.12×105
Pet was discovered and patented in england in 1941. This interferes with crystallization and lowers the polymer's melting temperature. Petg can be colored during processing. Petg is an amorphous plastic, which means that the molecular chains are not aligned or ordered in the material.
It is a pretty good material, both in strength and appearance.
Polyethylene glycol in an amount sufficient to increase the wetting and wicking properties of a filament made from the composition to a level substantially similar to the wetting and wicking properties of cotton and other cellulosic fibers. The most common second diol is chdm and the petg name is applied to the copolyesters with enough chdm content to slow crystallization rates so that the copolyesters. An initial depo!ymerization of the pet conducted in the presence of a monoethylene glycol /neopentyl glycol mixture, followed by a polymerization step. Polyethylene terephthalate glycol / petg.
Polyethylene terephthalate is made from terephthalic acid and ethylene glycol.
Features & benefits excellent layer adhesion warp resistance reduced shrinkage higher density chemical. Both petg and pett are popular for transparency and do not require a heated printing table. The process comprises two distinct steps: 12) is a copolymer derived from polyethylene terephthalate (pet) when modified with glycol.another variant of pet is trimethylene polyetherphthalate (pett), a slightly more rigid filament than petg.
It has great chemical resistance with good water, acidic and alkalic resistance.
Petgs can be processed over a wider processing.
