Ethylene Vinyl Acetate - EVA 33% VA

May 9 2001

Topics Covered
Introduction
Polymer Type
Advantages
Disadvantages
Typical Properties
Applications

Introduction

Ethylene vinyl acetate (EVA) is the copolymer of vinyl acetate (VA) and ethylene. The large majority of the copolymer's weight percentage is ethylene and the VA composition tends to vary between 10-40%. Properties and applications of EVA will differ based upon the ratio between the ethylene and VA but this article will consider EVA 33wt% VA.

Polymer Type

Thermoplastic

Advantages

When compared with EVA containing 12/25wt% VA, EVA 33wt% VA has a number of advantages:

  • Excellent heat seal strength

  • Good flexibility

  • Low temperature performance

Disadvantages

However, it also has some disadvantages compared to EVA containing 12/25wt%:

  • Poor tensile strength

  • Low resistance to heat deformation

  • Poor chemical resistance and barrier properties

Typical Properties

Property

Value

Density (g/cm3)

0.95

Surface Hardness

SA65

Tensile Strength (MPa)

10

Flexural Modulus (GPa)

0.007

Notched Izod (kJ/m)

1.06+

Linear Expansion  (/°C x 10-5)

18

Elongation at Break (%)

900

Strain at Yield (%)

N/Y

Max. Operating Temp. (°C)

50

Water Absorption (%)

0.13

Oxygen Index (%)

20

Flammability UL94

HB

Volume Resistivity (log ohm.cm)

16

Dielectric Strength (MV/m)

25

Dissipation Factor 1kHz

0.03

Dielectric Constant  1kHz

3.1

HDT @ 0.45 MPa (°C)

20-

HDT @ 1.80 MPa (°C)

20-

Material. Drying  hrs @ (°C)

NA

Melting Temp. Range (°C)

130 - 190

Mould Shrinkage (%)

2

Mould Temp. Range (°C)

20 -  40

 

Applications

  • Cable sheaths, hose, sheet, ring seals, protective caps, clips 

  • Cable binders

  • Infusion bottles, lids 

  • Flexible panels, bellows, rail pads and O-rings

 

Source : Abstracted from Plascams

For more information on Plascams please visit RAPRA Technology Ltd.

 

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