GB/T 1033.1-2008 English PDF (GBT1033.1-2008)

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GB/T 1033.1-2008: Plastics -- Methods for determining the density of non-cellular plastics -- Part 1: Immersion method, liquid pycnometer method and titration method
GB/T 1033.1-2008
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.01
G 31
GB/T 1033.1-2008 / ISO 1183-1:2004
Replacing GB/T 1033-1986
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)
ISSUED ON: AUGUST 04, 2008
IMPLEMENTED ON: APRIL 01, 2009
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 5 
2 Normative references ... 5 
3 Terms and definitions ... 6 
4 Conditioning ... 6 
5 Methods ... 7 
6 Correction for buoyancy in air ... 13 
7 Test report ... 14 
Annex A (informative) Liquid systems suitable for use in Method C ... 15 
Foreword
GB/T 1033 “Plastics - Methods for determining the density of non-cellular
plastics” consists of 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 1 of GB/T 1033.
This Part identically adopts ISO 1183-1:2004 “Plastics - Methods for
determining the density of non-cellular plastics - Part 1: Immersion method,
liquid pycnometer method and titration method” (English version).
For ease of use, for ISO 1183-1:2004, this Part also made the following editorial
modifications:
a) deleted the foreword of ISO 1183-1:2004;
b) replaced the 2 international standards in “Normative references” with
national standards that use the international standards.
This Part replaces GB/T 1033-1986 “Test method for density and relative
density of plastics”.
Compared with GB/T 1033-1986, the main changes in this Part are as follows:
a) Immersion method: the thermostatic control temperature of the immersion
liquid is changed from 23°C±1°C to 23°C±0.5°C (or 27°C±0.5°C); the
specimen mass is changed from 1g～5g to greater than 1g; the diameter
of the suspension wire is changed from less than 0.13mm to less than
0.5mm; stipulated the requirements of weighing accuracy in weighing.
b) Liquid pyknometer method: stipulated the method of vacuuming the
pycnometer; stipulated the temperature of the pycnometer at the constant
temperature of the liquid bath; stipulated the number of measurements of
the density of each specimen and the method of expression of the
measurement results.
c) Added titration method; deleted float-sink method, densitometer method
and standard density gradient column method.
Annex A of this Part is informative.
This Part was proposed by China Petroleum and Chemical Industry Association.
This Part shall be under the jurisdiction of National Technical Committee on
Plastics of Standardization Administration of China (SAC/TC 15).
Main drafting organizations of this Part: National Chemical Building Materials
Testing Center (Materials Testing Department) of Sinopec Beijing Chemical
Research Institute.
The drafting organizations of this Part: National Synthetic Resin Quality
Supervision and Inspection Center, Beijing Yanshan Petrochemical Resin
Institute, National Petrochemical Organic Raw Material Synthetic Resin Quality
Inspection Center, Guangzhou Kingfa Technology Co., Ltd., National Plastics
Quality Inspection Center (Beijing).
Main drafters of this Part: Gui Hua, Hu Xiaoyi, You Huan, Chen Hongyuan,
Wang Chaoxian, Zhao Ping, Ye Nanbiao, Weng Yunxuan.
This Part was issued in December 1986 for the first time. This is the first revision.
Plastics - Methods for determining the density of non-
cellular plastics - Part 1: Immersion method liquid
pyknometer method and titration method
1 Scope
This Part of GB/T 1033 specifies three methods for the determination of the
density of non-cellular plastics in the form of void-free moulded or extruded
objects, as well as powders, flakes and granules.
- Method A: Immersion method, for solid plastics (except for powders) in void-
free form.
- Method B: Liquid pyknometer method, for particles, powders, flakes,
granules or small pieces of finished parts.
- Method C: Titration method, for plastics in any void-free form.
NOTE: This Part is applicable to pellets as long as they are void-free. 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. This note is applicable to all three methods.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Part of GB/T 1033. For dated references, the
subsequent amendments (excluding corrigendum) or revisions do not apply to
this Standard, however, parties who reach an agreement based on this
Standard are encouraged to study if the latest versions of these documents are
applicable. For undated references, the latest edition of the referenced
document applies.
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)