GB/T 3682-2000 in English

本标准规定了在规定的温度和负荷条件下测定热塑性塑料熔体质量流动速率（MFR）和熔体体积流动速率（MVR）的方法。通常，测定熔体流动速率的试验条件由本标准引用的材料标准规定。热塑性塑料的一般试验条件列于附录A和附录B中。在比较填充和非填充热塑性塑料时，熔体体积流动速率是很有用的。如果知道试验温度下的熔体密度，则可以用自动测量装置测定熔体流动速率。本方法不适用于流变行为受水解、缩聚或交联影响的热塑性塑料。

Scope

This standard specifies the method for determining the melt flow rate and melt volume flow rate of thermoplastics under specified temperature and load conditions. Generally, the test conditions for determining the melt flow rate are specified by the material standards cited in this standard. General test conditions for thermoplastics are listed in Appendix A and Appendix B. Melt volume flow rate is useful when comparing filled and unfilled thermoplastics. If the melt density at the test temperature is known, the melt flow rate can be determined with an automatic measuring device. This method is not applicable to thermoplastics whose rheological behavior is affected by hydrolysis, polycondensation or crosslinking. 1.2 The melt mass flow rate and melt volume flow rate of thermoplastics are related to the shear rate. The shear rate in this test is much smaller than the actual processing shear rate. Therefore, the data obtained by this method for various thermoplastics are not necessarily related to their performance in actual use. Both methods are useful in quality control.