GB/T 1033.3-2010 English PDF (GBT1033.3-2010)

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GB/T 1033.3-2010: Plastics -- Methods for determining the density of non-cellular plastics -- Part 3: Gas pycnometer method
GB/T 1033.3-2010
GB
NATIONAL STANDARD OF THE
PEOPLE'S REPUBLIC OF CHINA
ICS 83.080.01
G 31
GB/T 1033.3-2010 / ISO 1183-3:1999
Plastics - Methods for determining the density of non-
cellular plastics - Part 3: Gas pycnometer method
(ISO 1183-3:1999, IDT)
ISSUED ON: SEPTEMBER 26, 2010
IMPLEMENTED ON: AUGUST 1, 2011
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Terms and definitions ... 5
3 Principle ... 7
4 Instruments and materials ... 7
5 Test specimens ... 8
6 Calibration ... 8
7 Procedure and calculation ... 9
8 Precision ... 9
9 Test report ... 10
Appendix A (Informative) Two-chamber pressure-type gas pycnometer ... 11
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 pycnometer method and titration method;
-- Part 2: Density gradient column method;
-- Part 3: Gas pycnometer method.
This part is Part 3 of GB/T 1033.
This part was translated from and identical to ISO 1183-3:1999 Plastics - Methods for
determining the density of non-cellular plastics - Part 3: Gas pycnometer method
(English version).
For ease of use, this part also makes the following editorial changes to ISO 1183-3:1999.
-- The term "this international standard" is replaced with "this standard", "this part"
or "GB/T 1033.3-2010";
-- The foreword of ISO 1183-3:1999 is deleted;
-- The foreword of this part is added;
-- The normative reference documents are added;
-- Chinese decimal point symbol "." is used to replace the decimal point symbol ","
in the international standard.
Appendix A of this part is an informative appendix.
This part was proposed by China Petroleum and Chemical Industry Federation.
This part is under the jurisdiction of the Sub-committee on Methods of Test and
Material for Plastics and Resins of the National Technical Committee on Plastics of
Standardization Administration of China (SAC/TC15/SC4).
Responsible drafting organizations of this part: National Synthetic Resin Quality
Supervision and Inspection Center, China Bluestar Chengrand Co., Ltd., Guangzhou
Synthetic Material Institute Co., Ltd.
Participating drafting organizations of this part: Kingfa Sci. and Tech. Co., Ltd., Resin
Application Research Institute of Sinopec Beijing Yanshan Petrochemical Co., Ltd.,
Plastics - Methods for determining the density of non-
cellular plastics - Part 3: Gas pycnometer 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 measuring the density or specific
volume of solid non-cellular plastics of any shape without internal pores.
2 Terms and definitions
The following terms and definitions apply to this part of GB/T 1033.
2.1 test material
Material to be tested.
2.2 test specimen
The part of the test material that is actually tested.
2.3 mass
The amount of matter contained in an object, which is expressed in kilograms (kg) or
grams (g).
2.4 weight
The force produced by gravity acting on a mass, expressed in Newtons (N).
NOTE: Gravity varies by location, and so does weight.
5 Test specimens
5.1 If the conditioning is carried out, the specimen shall be dried to constant weight
before volume measurement. Carefully select appropriate drying conditions to prevent
changes in the density of the test material.
5.2 The test material may be in the form of powder, granules, flakes and sheets. Other
materials may also be cut into any shape suitable for the volume size of the gas
pycnometer used. Avoid density changes due to compressive stress during cutting.
The specimens of materials containing closed pores shall be prepared by suitable
methods, such as grinding.
5.3 If the conditioning may cause the change in the specimen density to be greater than
the required accuracy of the measurement, the conditioning shall be carried out
according to the relevant material standards before the test. Sometimes, it may be
required that the conditioning is carried out under the conditions of specified humidity
or achieving constant crystallinity.
5.4 When changes in density as a function of time or ambient conditions are the main
purpose of the determination, conditions of the specimen conditioning shall be
calibrated according to the consensus reached by all parties.
6 Calibration
Adjust the temperature of the gas pycnometer to the required value, preferably
(23±1) °C. Adjust the volume of the gas pycnometer to the required value or measure
the volume of the empty gas pycnometer. Measure the mass of a calibration specimen
of known density with an accuracy of 0.1 mg, or use a calibration specimen of known
volume. Place the calibration specimen in the measurement chamber and purge it with
the measurement gas for 3 minutes to remove air and moisture adsorbed on the
specimen surface. If necessary, allow additional time for the temperature to equilibrate.
When the preset temperature is reached, place the specimen in accordance with the
specific operating instructions for the type of gas pycnometer used and measure the
volume change or the resulting pressure change. Determine the calibration factor kc
using equation (3) or equation (4).
NOTE: When using a pressure-type instrument, the volume of the specimen can be calculated from the
pressure change using the ideal gas pressure-volume relationship (Boyle-Mariotte law). Some gas
pycnometers can automatically calculate the volume of the specimen.