PEN plastic from Japan

Polyethylene naphthalate

Polyethylene naphthalate (poly(ethylene 2,6-naphthalate) or PEN) is a polyester derived from naphthalene-2,6-dicarboxylic acid and ethylene glycol. As such it is related to poly(ethylene terephthalate), but with superior barrier properties.
Benefits when compared to polyethylene terephthalate
The two condensed aromatic rings of PEN confer on it improvements in strength and modulus, chemical and hydrolytic resistance, gaseous barrier, thermal and thermo-oxidative resistance and ultraviolet (UV) light barrier resistance compared to polyethylene terephthalate (PET). PEN is intended as a PET replacement, especially when used as a substrate[3] for flexible integrated circuits.
Polyethylene naphthalate (PEN) resin became popular in various fields after U.S. company Amoco Chemicals started commercial production of naphthalenedicarboxylic acid (NDC) , a raw material of PEN, in 1995. In 1964, 31 years before that, Teijin started development of PEN and commercialized as Teonex®. Since then, Teonex® has been popular as a functional material for industrial parts and wrapping materials for food and drugs, and still steadily increasing the area of applications. Teonex® is a crystalline thermoplastic polyester, a polycondensate of NDC as an acid component and ethylene glycol as a glycol component, manufactured in a process similar to that of polyethylene terephthalate (PET), a typical polyester. The property of Teonex® is considered superior to that of PET. Teonex® is crystalline resin, crystallized slowly, making it easier to shape transparent molded products. Teonex® has a superior chemical and scratch resistance compared to polycarbonate (PC) resin, a typical resin used in transparent molded products.
MVR    m3/10min    ISO 1133    300℃, 1.2kgf    18    5    -    8
Density    kg/m3    ISO 1183    -    1,330    1,330    1,330    1,200
Tensile modulus    MPa    ISO 527-1
and
ISO 527-2    1mm/min    2,200    2,200    2,300    2,400
Tensile yield strength    MPa    50mm/min    80    80    58    61
Tensile yield strain    %    50mm/min    7    7    4    6
Tensile stress at break    MPa    50mm/min    38    40    28    75
Tensile strain at break    %    50mm/min    15    50    >200    >50
Flexural modulus    MPa    ISO 178    2mm/min    2,250    2,200    2,500    2,300
Flexural strength    MPa    2mm/min    99    98    81    91
Charpy impact strength    kJ/m2    ISO 179    Un-notched    98    NB    NB    NB
Notched    2.0    2.8    3.5    76
Temperature of eflection under load    ℃    ISO 75-1
and
ISO 75-2    1.80MPa    91    92    65    129
0.45MPa    105    107    68    142
Rockwell hardness    -    ASTM D 785    M scale    107    107    80    67

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