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Notched Impact Strength:
An important property of Polytron Product is its High Impact Strength which retains good values down to very low temperature. Even very severe impact stresses do not lead to product failure. In the standard IZOD notched impact test, no product fracture/crack is obtained. Because of its exceptional Toughness, Polytron Products withstand some Impact Stress without cracking even at temperature of liquid Helium ( -269 Degree C).
Sliding Properties and Friction Co-Efficient:
Polytron exhibits particularly good surface properties (Abrasion, Low Friction and Wear Behavior), an important advantage in many technical applications. Polytron is an excellent material for sliding application. Test in which Polytron is compared with other plastic material, showed that it possess Self Lubricating properties particularly in dry sliding movement against metal surface such as Steel, Brass or Copper. These properties are in-valuable in dry running conditions. The paraffin wax like surface characteristics of molded part made from Polytron, prevents caking or freezing on the surface by many specially moist, bulk material.
Wear Resistance:
The amount of wear exhibited by Polytron is very slight when it comes across any continuous rubbing elements. This specific property of Polytron actually minimizes the losses and prevent the down time to a great extent. Polytron parts are efficiently working in the critical conditions where the rubbing element is running over at the speed of 400-500 Meter Per Minute. Though higher grades of Polytron is being used for high speed machines. The excellent wear resistance make this product quite useful and preferred over any other metal or plastic.
Chemical Properties:
Polytron has very good resistance to aggressive media. Aromatic and halogenated hydrocarbons, which dissolve Poly-Ethylenes of lower molecular weight, cause only slight surface swelling in contact with Polytron at moderate temperature. It is known that the stress cracking resistance of PE increases with the increasing molecular weight.
Water Absorption:
Polytron Products are water-repellent and does not swell. The properties of Polytron are maintained in the finished part regardless of environmental humidity.
USDA and FDA Approved:
The Polytron Standard grades, in natural color are chemically accepted as per USDA and FDA as a material in direct contact with food items.
Heat Resistance:
Polytron has a higher heat resistance than Poly Ethylene with lower molecular weight. Eg: A pipe section made of Polytron placed in an ovan at 150 Degree C retains its shape for a long period while a similarly dimension pipe made of Poly Ethylene of lower molecular weight very quickly collapses. At low mechanical stress level the material can be employed at temperatures in region of 80 D to 100 D Celsius without any substantial deformation taking place.
Co-efficient of Linear Thermal Expansion:
In designing close tolerance components of Polytron that are to be exposed to fluctuating temperature, thermal expansion has to be specially considered. Annealing of Polytron significantly reduce the stresses. In the 50 to 80 Degree C temperature range, annealing produces a significant reduction in the co-efficient of Linear Thermal Expansion.
Thermal Conductivity:
The Thermal conductivity of Polytron is very low – 0.41 W/m .K at 23 Degree C. In many application, however, the rapid dissipation of the frictional heat is very important. By adding thermally conducting additives, the thermal conductivity of Polytron can be considerably improved.
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