Written by AZoMMay 11 2001
Topics Covered
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Introduction
Polymer Type
Advantages
Disadvantages
Typical Properties
Applications |
Introduction
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Thermoplastic elastomers (TPE) contain materials which display both elastomeric and thermoplastic properties. Generally, elastomers are thermosets and so TPEs are much more desirable, as thermoplastics are easier to manufacture, for example by injection moulding. It is a particular type of crosslinking bonding which separates thermoset elastomers and thermoplastic polymers. An olefinic-based thermoplastic elastomer is a TPE which contains at least one olefin (unsaturated carbon-carbon double bond, sometimes referred to as an alkene).
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Polymer Type
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Thermoplastic
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Advantages
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When compared to Ol TPE 65A, Ol TPE 85A has a number of advantages:
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Better tensile strength
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Better flexural modulus
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Disadvantages
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Compared to Ol TPE 65A it has:
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Typical Properties
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Density (g/cm3)
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0.84
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Surface Hardness
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SA85
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Tensile Strength (MPa)
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9
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Flexural Modulus (GPa)
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0.03
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Notched Izod (kJ/m)
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1.06+
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Linear Expansion (/°C x 10-5)
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15
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Elongation at Break (%)
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700
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Strain at Yield (%)
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N/Y
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Max. Operating Temp. (°C)
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85
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Water Absorption (%)
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0.01
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Oxygen Index (%)
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19
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Flammability UL94
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HB
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Volume Resistivity (log ohm.cm)
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16
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Dielectric Strength (MV/m)
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24
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Dissipation Factor 1kHz
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0.0008
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Dielectric Constant 1kHz
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2.2
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HDT @ 0.45 MPa (°C)
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20-
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HDT @ 1.80 MPa (°C)
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20-
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Material. Drying hrs @ (°C)
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NI
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Melting Temp. Range (°C)
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200 - 240
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Mould Shrinkage (%)
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1.5
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Mould Temp. Range (°C)
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40 - 60
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Applications
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Insulation cable
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Car bumpers, radiator grills, body panels, mud flaps, wheel arch protectors
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Impact modifier for polypropylene.
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Source : Abstracted from Plascams
For more information on Plascams please visit RAPRA Technology Ltd.
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