This part of GB/T 1033 specifies a gradient column method for the determination of the density of non-cellular plastics.
This part is applicable to the pellets of non-cellular moulded or extruded plastics in void-free form.
Note: Density is frequently used to follow variations in physical structure or composition of plastic materials. Density may also be useful in assessing the uniformity of samples or specimens. Often the density of plastic materials will depend upon the choice of specimen preparation method. When this is the case, precise details of the specimen preparation method will have to be included in the appropriate material specification.
2 Normative References
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of GB/T 1033. For dated references, subsequent amendments (excluding corrections), or revisions, of any of these publications do not apply to this part. However parties to agreements based on this part are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies.
GB/T 1033.1-2008 Plastics — Methods for Determining the Density of Non-cellular Plastics —Part 1: Immersion Method Liquid Pyknometer Method and Titration Method (ISO 1183-1:2004, IDT)
GB/T 2035-2008 Terms and Definitions for Plastics (ISO 472:1999, IDT)
GB/T 2918-1998 Plastics — Standard Atmospheres for Conditioning and Testing (idt ISO 291: 1997)
GB/T 6379.2-2004 Accuracy (Trueness and Precision) of Measurement Methods and Results — Part 2: Basic Method for the Determination of Repeatability and Reproducibility of a Standard Measurement Method (ISO 5725-2:1994, IDT)
3 Terms and Definitions
For the purposes of this part, the terms and definitions given in GB/T 2035-2008 and the following apply.
3.1
density
ρ
ratio of the mass m of a sample to its volume V (at the temperature t) expressed in kg/m3, kg/dm3(g/cm3) or kg/L(mg/mL)
