Teknor Apex Medalist® MD-320 Thermoplastic Elastomer

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Teknor Apex Medalist® MD-320 Thermoplastic Elastomer
Categories:	Polymer; Thermoplastic; Elastomer, TPE
Material Notes:	Uses: Medical/Healthcare Applications; Pharmaceuticals; Safety Equipment Agency Ratings: ISO 10993 Part 5 Processing Method: Extrusion; Injection Molding Forms: Pellets Injection Notes: Moisture can degrade the material. Drying is suggested. This can be accomplished by placing the material in a desiccant dryer for 2 to 4 hours at 140°F. Extrusion Notes: Screw Speed: 30 to 100 rpm Information Provided by Teknor Apex
Key Words:	TPE
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Physical Properties	Metric	English	Comments

Specific Gravity	0.950 g/cc	0.950 g/cc	ASTM D792
Linear Mold Shrinkage	0.024 cm/cm	0.024 in/in	ASTM D955
Linear Mold Shrinkage, Transverse	0.021 cm/cm	0.021 in/in	ASTM D955
Melt Flow	8.0 g/10 min @Load 2.16 kg, Temperature 190 °C	8.0 g/10 min @Load 4.76 lb, Temperature 374 °F	ASTM D1238

Mechanical Properties	Metric	English	Comments
Hardness, Shore A	55	55	ASTM D2240
Tensile Strength at Break	7.24 MPa	1050 psi	ASTM D412
Tensile Stress at Strain	2.38 MPa @Strain 100 %	345 psi @Strain 100 %	ASTM D412
	3.03 MPa @Strain 200 %	440 psi @Strain 200 %	ASTM D412
	3.62 MPa @Strain 300 %	525 psi @Strain 300 %	ASTM D412
Elongation at Break	800 %	800 %	ASTM D412
Tear Strength	29.8 kN/m	170 pli	ASTM D624
Compression Set	30 % @Temperature 22.8 °C, Time 79200 sec	30 % @Temperature 73.0 °F, Time 22.0 hour	ASTM D395

Processing Properties	Metric	English	Comments
Rear Barrel Temperature	127 - 149 °C	260 - 300 °F
Middle Barrel Temperature	138 - 160 °C	280 - 320 °F
Front Barrel Temperature	149 - 171 °C	300 - 340 °F
Nozzle Temperature	171 - 193 °C	340 - 380 °F
Zone 1	138 - 149 °C	280 - 300 °F
Zone 2	149 - 160 °C	300 - 320 °F
Zone 3	160 - 182 °C	320 - 360 °F
Zone 5	171 - 193 °C	340 - 380 °F
Die Temperature	182 - 204 °C	360 - 400 °F
Melt Temperature	171 - 193 °C	340 - 380 °F	Processing Temperature
Mold Temperature	21.1 - 37.8 °C	70.0 - 100 °F
Drying Temperature	60.0 °C	140 °F
Dry Time	2 - 4 hour	2 - 4 hour
Injection Pressure	1.38 - 5.52 MPa	200 - 800 psi
Back Pressure	0.172 - 0.689 MPa	25.0 - 100 psi
Cushion	0.381 - 2.54 cm	0.150 - 1.00 in
Screw Speed	50 - 100 rpm	50 - 100 rpm

Descriptive Properties
Appearance	Translucent

Some of the values displayed above may have been converted from their original units and/or rounded in order to display the information in a consistent format. Users requiring more precise data for scientific or engineering calculations can click on the property value to see the original value as well as raw conversions to equivalent units. We advise that you only use the original value or one of its raw conversions in your calculations to minimize rounding error. We also ask that you refer to MatWeb's terms of use regarding this information. Click here to view all the property values for this datasheet as they were originally entered into MatWeb.

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