Melt flow index ASTM

Flowability MFI melt flow index, ASTM D 1238 Procedure A Extrusion plastometer... 

Notes Melt Flow Index ASTM 1238-Condition E 120-150. Hardness Shore A 86 ... 

Notes Melt Flow Index ASTM 1238-Condition E 500-600. Hardness Shore A 85 Notes Melt Flow Index ASTM 1238-Condition E 550-650. Hardness Shore A. 80 ... 

Notes Melt Flow Index ASTM 1236-Condltion E 10-15. Hardness Shore A 88 Standard film thickness 0.08mm. 

Melt Flow Rate/Melt Flow Index ASTM D1238 ISO 1133... 

Modification of BPA-PC for adaptation to the conditions of production of CD and CD-ROM disks, and of substrate disks for WORM and EOD was necessary. BPA-PC standard quaHties for extmsion and injection mol ding have, depending on molecular weight, melt flow indexes (MEI), (according to ISO 1130/ASTM 1238 in g/10 min at 300°C/1.2 kg, between less than 3 g/10 min (viscous types) up to 17 g/10 min. For CDs and optical data storage disks, however, MEI values exceeding 30 g/10 min, and for exceptionally short cycle times (5—7 s) even >60 g/lOmin are demanded at an injection mass temperature of 300°C (see Table 5). 

Ionomer resins are produced in multiple grades to meet market needs, and prospective customers are provided with information on key processing parameters such as melt-flow index. Nominal values for many other properties are Hsted in product brochures. The ASTM test methods developed for general-purpose thermoplastic resins are appHcable to ionomers. No special methods have been introduced specifically for the ionomers. 

Figure 11.6. Variation of ASTM D746 brittle point with melt flow index and isotactic index (After...

Melt flow index (g/10 min) 150°C, 2160 g Thermal properties ASTM D1238 3 3 3... 

The melt (flow) index has become a widely recognised criterion in the appraisal of extrudability of thermoplastic materials, especially polyolefins. It is standardised as the weight of polymer (polyolefin) extruded in 10 min at a constant temperature (190 °C) through a tubular die of specified diameter (0.0825 in. = 2.2 mm) when a standard weight (2.160 kg) is placed on the driving piston (ASTM D 1238). 

MFI melt flow index similar to MI but measured under different ASTM test and used mostly with PP... 

A variation of a capillary rheometer as the one previously described can be used to determine the melt flow index (MET) of thermoplastic melts. The MFl is the amount of polymer flowing through a capillary of specific dimensions under a given weight and at a given temperature as those are described by international standards, such as the American Standards for Testing and Materials (ASTM). 

Melt flow index measurements of the composites were carried out on a MFI (MP-E) Microprocessor apparatus at 230 °C and under a 2.16 kg weight. The capillary die was 2.095 mm in diameter and 8 mm in length. About 5 g of composite was put into barrel and heated for 5 min to reach the predetermined temperature on the plunger to extrude the melt through the capillary die. After a steady flow state was reached, five samples were cut sequentially and their average weight value was obtained. Experiments were done according to ASTM D-1238. 

Polyethylene (KF380, melt flow index (MFR) 4.0g/10min ASTM D1238 (190 °C, 2.16 kg) PE) suppUed by Japan Polychem Corp. 

The melt flow index (also called melt index or melt flow rate) is the number of grams of a polymer that can be pushed out of a capillary die of standard dimensions (diameter 2.095 mm length 8.0 mm) under the action of standard weight (such as 2.16 kg for polyethylene at 190° C) in 10 min (ASTM standard 1238). 

Extrusion plastometer (melt-indexer) ru A simple viscometer consisting of a heated vertical cylinder with two bores, a central one that contains a close-fitting piston and a recess for an orifice block, the other, nearby, for a thermoswitch. The orifice is 2.1 nun in diameter and 8 mm long. Plastic particles are loaded into the bore, allowed to heat for 6-8 min, then the weighted piston is released, and the extrudate is collected for a measured time internal. The melt-flow index (MFI) is stated as the rate of extrusion in grams/10 min. The instrument and its use are described in ASTM D 1238. Originally developed in 1953 for low-density polyethylene, the melt-indexer is now used with many other polymers with specific temperatures and piston weights. It... 

The pol mier used in this work was polypropylene (PP) ECOLEN HZlOK (Hellenie Petroleiun, Greeee), kindly supphed in pellets by Ashland Chemical Hispania (Barcelona, Spain). Melt flow index (MFI) was 3.2 g 10 min determined according to ASTM-D1238 standard (230 C, 2.16 Kg), and density 0.9 g cm" Carvacrol (98%) and thymol (99.5%) were obtained from Sigma-Aldrich (Madrid, Spain). 

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