GB/T 1033.1-2008Plastics -- Methods for determining the density of non-cellular plastics -- Part 1: Immersion method, liquid pycnometer method and titration method (English PDF)

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.

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.

3 Terms and definitions

For the purposes of this document, the terms and definitions defined in GB/T

2035-2008 as well as the followings apply to this Part of GB/T 1033.

the 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

4 Conditioning

The test atmosphere shall be in accordance with GB/T 2918-1998.In general,

conditioning specimens to constant temperature is not required, because the

determination itself brings the specimen to the constant temperature of the test.

5 Methods

Use freshly distilled or deionized water or another suitable liquid containing not

more than 0.1% of a wetting agent to help in removing air bubbles. The liquid

or solution with which the specimen comes into contact during the

measurement shall have no effect on the specimen.

Add more of the denser liquid until the heaviest pieces of specimen remain at

a constant level within the liquid for at least 1 min.

6 Correction for buoyancy in air

Where weighings are made in air, the values of the "apparent masses" obtained

shall be corrected to compensate for the effect of the air buoyancy on the

specimen and on any weights used. This will be the case if the accuracy of the

results is to be between 0.2% and 0.05%.

7 Test report

The test report shall include the following information.

Annex A

(informative)

Liquid systems suitable for Method C

Liquid system suitable for Method C of this Part is given in table A.1.

WARNING - some of the following chemicals may be hazardous.

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