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Polyethylene impact testing

Polyolefins. Ultra-High-Molecular-Weight Polyethylene.TIus is easily made by conventional low-pressure coordination polymerization. Hercules Hi-fax 1900 has a molecular weight of 2.5-5.0 million. Its outstanding properties are low coefficient of friction (0.11) abrasion-resistance superior to nylon, polyurethane, and steel unbreakable in the Izod notched impact test and high resistance to most inorganic and many organic chemicals. [Pg.20]

A free-falling dart method for polyethylene films is described in ASTM D1709. Unlike low-speed uniaxial tensile tests, the pendulum impact test measures the resistance of film to impact puncture, simulating high-speed end use application. Dart drop measures the energy lost by a moderate velocity blunt impact passing through... [Pg.277]

Kozlov, G. V., Novikov, V. U. (1997). The Physical Significance of Dissipation Processes in Impact Tests of Semicrystalline Polymers. Prikladnaya Fizika, 1,77-84. Kozlov, G. V., Serdyuk, V. D., Beloshenko, V. A. (1994). Plastic Constraint Factor and Mechanical Properties of High Density Polyethylene at Impact Loading. Mekhanika... [Pg.229]

Impact test can be used to evaluate the fracture characteristics of polyethylene composites. In this test, pendulum with a massive striking edge is allowed to hit the specimen. The mass and the drop height determine the potential energy of the hammer. The impact test can be carried out by using ASTM D-256 method. [Pg.285]

The effect of test velocity on weld performance was investigated with impact tests performed at 20 C and 1, 2 and 3.7 m/s. Over this range the dynamic effects very often overshadow the true material response and additional measurement techniques must be applied to determine dynamic fracture toughness [8]. Therefore impact strength was evaluated as the ratio of the total consumed energy and the resistant area. The quahty of fused polyethylene joints was assessed by means of the weld efficiency, cp [9], which is defined as ... [Pg.424]

Laboratory tests indicated that gamma radiation treatment and cross-linking using triaHylcyanurate or acetylene produced a flexible recycled plastic from mixtures of polyethylene, polypropylene, general-purpose polystyrene, and high impact grade PS (62). [Pg.232]

Low Temperature Brittleness. Brittleness temperature is the temperature at which polyethylene becomes sufficiently brittle to break when subjected to a sudden blow. Because some polyethylene end products are used under particularly cold climates, they must be made of a polymer that has good impact resistance at low temperatures namely, polymers with high viscosity, lower density, and narrow molecular weight distribution. ASTM D746 is used for this test. [Pg.372]

ISO 13957 1997 Plastics pipes and fittings - Polyethylene (PE) tapping tees - Test method for impact resistance... [Pg.237]

In tests of materials saturated with liq oxygen and subjected to 71-75 lb drop weight tests, the following were found acceptable (one de-tonation/40 impacts or none/20) fluorocarbon oils greases, graphite, halogenated biphenyl molybdenum disulfide lubricants, polyethylene... [Pg.582]

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See also in sourсe #XX -- [ Pg.246 ]



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