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Limitations: High thermal expansion, UV degradation, poor weathering
resistance, subject to attack by chlorinated solvents and aromatics, Difficulty to
bond or paint, oxidizes readily, flammable
Applications: from crates and bins, through housewares, washing machine drums
and plumbing fittings, to automotive applications such as bumpers and dashboards,
Chemical and plating tanks, Orthotics and prosthetics, Film, Containers,
Appliances, Packaging, Electrical/Electronic, furniture, paint pails, industrial
products, Medical products, others
9) Polymethylpentene (PMP):
Is a thermoplastic polymer of methyl pentene monomer units. Its properties are
reasonably similar to those of other polyolefins, although it is more brittle and more
gas permeable.
Density 0.835 - 0.84 g/cm 3
Melting Temperature 220°C to 240°C
Processing Temperature ± 300°C
Processed by Blow, Injection and Extrusion process
Properties: Transparent crystalline material, rigid, tough, lightweight, highly
permeable to gases, excellent heat and chemical resistance, autoclavable, very low
surface tension, excellent electrical insulator, low dielectric properties and release
qualities, strong hydrolysis and vapour resistance, Very low density, Low water
absorption , Exceptional acoustical properties, High melting point and Vicat
softening point, FDA compliant,
Limitations: Attacked by oxidizing agents, hydrogen carbon and chlorinated
solvents, Poor UV resistance and quite flammable, expensive then polyolefins
Applications: Medical and laboratory equipments, syringes, lamp covers radar
applications, encapsulation, microwave food packaging, release paper for
synthetic leather, Release Films, Mandrels, Cosmetic caps and tubes, Heat
resistant non-woven, ultrasonic transducer heads.
10) Ethylene Vinyl Acetate :
Popularly known as EVA is the copolymer of ethylene and vinyl acetate. Polymer is
highly flexible, compatible with many other polymers and additives and is easy to
process. The weight percent of vinyl acetate usually varies from 8 to 35% and higher
the VA content more is the flexibility. EVA has little or no odour and is competitive
with rubber and vinyl products in many electrical applications.
Density 0.926 - 0.950 g/cm 3
Melting Temperature 55°C - 100°C (varying VA %)
Max / Min continuous Service temperature 45 - 65 °C / - 60 °C
Processing Temperature 150 - 220°C
Processed by conventional thermoplastic or by rubber processing techniques
Properties: Tough, transparent to semi-opaque material with relatively low upper
o
working temperatures (65 C), Flexible (rubbery), Resilient, Crack resistant, good
low temperature flexibility (-70°C), good chemical resistance, high friction
coefficient, ESCR, good UV resistance. EVA is softer, clearer and more permeable
than LDPE.

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