GB/T 1033.2-2010Plastics -- Methods for determining the density of non-cellular plastics -- Part 2: Density gradient column method (English PDF)

Foreword

GB/T 1033 Plastics - Methods for determining the density of non-cellular plastics is

divided into the following three parts:

-- Part 1: Immersion method, liquid pyknometer method and titration method;

-- Part 2: Density gradient column method;

-- Part 3: Gas pyknometer method.

This part is Part 2 of GB/T 1033.

This part was redrafted and modified in relation to ISO 1183-2:2004 Plastics - Methods

for determining the density of non-cellular plastics - Part 2: Density gradient column

method (English version).

The technical differences between this part and ISO 1183-2:2004 and their reasons are

as follows:

-- The International Standards listed in the chapter "Normative references" are

respectively replaced by the Chinese national standards that correspond to these

documents. 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) is added to the reference documents;

-- The definition of "density gradient column" is added;

-- The float size requirement in ISO 1183-2:2004 is changed from "diameter not

more than 5 mm" to "diameter not more than 8 mm";

-- The requirements for accuracy of the calculation of density are clarified;

-- The content related to precision is added;

-- "Appendix C (Informative) Differences between this part of GB/T 1033 and

Method D in GB/T 1033-1986" is added.

For ease of use, this part makes the following editorial changes to ISO 1183-2.2004.

-- The foreword of ISO 1183-2:2004 is deleted;

-- According to the writing rules of Chinese standards, the Appendix B of the

original English text is changed into Appendix A of this standard, and the

Plastics - Methods for determining the density of non-

cellular plastics - Part 2: Density gradient column method

WARNING: The application of this part may involve some dangerous materials,

operations or equipment. This part does not address all possible safety issues

related to the application. The user of this part is responsible for establishing the

safety and health terms applicable to this part and determining the use

specifications of this part before use.

1 Scope

This part of GB/T 1033 specifies the method for determining the density of non-cellular

plastics using a density gradient column.

This standard applies to molded or extruded non-porous non-cellular plastic solid

particles.

NOTE: Density is usually used to examine the changes in the physical structure or composition of plastic

materials, and is also used to evaluate the homogeneity of samples or specimens. The density of plastic

materials is usually also closely related to the preparation method of the specimen. In this case, the

detailed method of specimen preparation shall be included in the relevant specifications of the material.

2 Normative references

The clauses in the following documents become clauses of this part through reference

in this part of GB/T 1033. For all dated referenced documents, all subsequent

amendments (excluding errata) or revisions are not applicable to this part. However,

parties to agreements based on this part are encouraged to study whether the latest

versions of these documents can be used. For all undated referenced documents, the

latest versions are applicable to this part.

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

NOTE: The diameter of the specimen is usually less than 5 mm.