Standard Test Method for Melt Flow Rates of Thermoplastics by Extrusion Plastometer

Importancia y uso:

5.1 This test method is particularly useful for quality control tests on thermoplastics.

5.2 The data produced by this test method serves to indicate the uniformity of the flow rate of the polymer as made by an individual process. It is not to be used as an indication of uniformity of other properties without valid correlation with data from other tests.

5.3 The flow rate obtained with the extrusion plastometer is not a fundamental polymer property. It is an empirically defined parameter critically influenced by the physical properties and molecular structure of the polymer and the conditions of measurement. The rheological characteristics of polymer melts depend on a number of variables. It is possible that the values of these variables occurring in this test will differ substantially from those in large-scale processes, which would result in data that does not correlate directly with processing behavior.

5.4 Measure the flow rate of a material using any of the conditions listed for the material in X4.1. For many materials, there are specifications that require the use of this test method, but with some procedural modifications that take precedence when adhering to the specification. Therefore, it is advisable to refer to that material specification before using this test method. Table 1 in Classification D4000 lists the ASTM materials standards that currently exist. An alternative test method for poly (vinyl chloride) (PVC) compounds is found in Test Method D3364.

5.5 Additional characterization of a material can be obtained if more than one condition is used. In the case that two or more conditions are employed, a Flow Rate Ratio (FRR) is obtained by dividing the flow rate at one condition by the flow rate at another condition. Procedure D provides one method to measure more than one condition in a single charge.

5.6 Frequently, variations in test technique, apparatus geometry, or test conditions, which defy all but the most careful scrutiny, exist, causing discrepancies in flow rate determinations. A troubleshooting guide is found in Appendix X2 and it is a resource to be used to identify sources of test error.

Subcomité:

D20.30

Referida por:

D7472-19R24, D4549-15R21, D5675-13R23, D3159-22, D5577-19, F0755-19, D2116-16R21, D7082-21, D5205-24, D6388-18, F2389-24A, D2239-22, F0714-25, F2619_F2619M-20, F0624-09R24, D5990-20A, D4203-17, D2839-16R23, F0639-09R24, D6434-25, D2839-16R23, D3350-24, D3307-21, F3123-22, F3219-24, F2435-22, D6213-17, F0997-18, D5721-22, D7238-20, D1248-16, F2881_F2881M-21E01, D3275-18R23, F3087-15R24, F0412-24A, F3034-21, D3364-99R19, D5138-23, F2764_F2764M-24, D6339-11R19, D7471-19R24, D2737-22, D3222-21, D3035-22, D3835-24, D3485-22, D4000-23, D6389-23, D0788-24, D3935-21, F3390-20R24, D4101-24, D8501-23A, D5422-17, D6265-23, D4067-23, D4635-25, D5422-17, F0790-23, F3508-21A, D6394-21A, D2839-16R23, D2513-24E01, F2150-19, D4976-12AR20, D4565-20, F0561-19, D5575-18R23

Volúmen:

08.01

Número ICS:

83.080.20 (Thermoplastic materials)

Palabras clave:

melt flow rate; melt index; volume flow rate;