GB/T 4472-2011 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 4472-2011 | English | 125 |
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Determination of density and relative density for chemical products
| Valid |
| GB/T 4472-1984 | English | RFQ |
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General rule for determination of density and relative density for chemical products
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GB/T 4472-2011: Determination of density and relative density for chemical products---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT4472-2011
GB
NATIONAL STANDARD
ICS 71.040.50
G 04
Replacing GB/T 4472-1984
Determination of density and relative density for
chemical products
Issued on. DECEMBER 30, 2011
Implemented on. OCTOBER 01, 2012
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 5
4 Test methods... 6
5 Test report... 25
APPENDIX A (Normative) Calibration of the volume of the gas density bottle
... 26
1 Scope
This standard specifies terms and definitions for the determination of density
and relative density for chemical products, as well as the methods for the
determination of density and relative density of solid, liquid and gaseous
chemical products.
This standard is applicable to the determination of density and relative density
of general chemical products.
This standard does not apply to the determination of density and relative
density of the chemical products of special status such as carbon black and
open-cell foam rubber or plastic, etc.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this Standard.
GB/T 6682 Water for analytical laboratory use - Specification and test methods
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Density
It refers to the result of mass divided by volume. ρ = m/V. It is expressed in
kilograms per cubic meter (kg/m3) or in multiples thereof. mega-gram per
cubic meters (Mg/m3), kilograms per cubic decimeters (kg/dm3), or gram per
cubic centimeters (g/cm3).
3.2
Relative density
It refers to, under the given conditions, the ratio of the density of a
substance to the density of another reference substance. d = ρ/ρ0
3.2.2
Relative density of liquid
It refers to, under the ambient temperature (20 °C), the ratio of the density of
a substance to the density of water at 4 °C. It is expressed by the relative
density d (water = 1).
3.2.3
Relative density of gas
It refers to, under the given conditions, the ratio of the vapor density of a gas
or the vapor density of a substance to the density of the reference
substance (air).
4 Test methods
4.1 General requirements
4.1.1 All instruments shall be clean AND dried and calibrated before use.
4.1.2 When heating the sample, it shall avoid the error due to the loss of
volatile components.
4.2 Determination of solid density
4.2.1 Requirements for test specimens
4.2.2 Method 1.density bottle method
4.2.2.1 Method summary
PLACE the sample into the density bottle of known volume; ADD the
determination medium; AND the sample volume can be calculated by
subtracting the volume of the medium under determination from the volume of
the density bottle. Then the sample density is the ratio of the mass of the
sample to its volume.
4.2.2.2 Instruments
4.2.2.3 Test conditions
4.2.2.3.1 The determination medium shall be pure AND shall not dissolve,
swell and react with the test specimen; BUT the surface of the test specimen
shall be moistened by the medium.
4.2.2.3.2 The determination medium is generally water, AND it may also select
other media (such as xylene, kerosene, etc.).
4.2.2.4 Operating procedure
4.3.1.2 Instruments
4.3.1.2.1 Analytical balance. the division value is 0.0001 g.
4.3.1.2.2 Density bottles. (25 ~ 50) cm3 (SEE Figure 1 and 4).
4.3.1.2.3 Constant temperature water bath. temperature controlled at (20 ±
0.1) °C.
4.3.1.2.4 Thermometer. the division value is 0.1 °C.
4.3.1.3 Operating procedure
4.3.1.3.1 WASH and DRY the density bottle; WEIGH it with plug.
4.3.2 Method 2.Wechsler balance method
4.3.2.1 Principles
In the water and the determination test specimen, respectively MEASURE the
buoyancy of the “floating hammer”; through the reading of the rider,
CALCULATE the density of the test specimen.
4.3.2.2 Instruments
4.3.2.2.1 Wechsler balance (SEE Figure 5).
4.3.2.2.2 Constant temperature water bath. temperature controlled at (20 ±
0.1) °C.
4.3.2.2.3 Thermometer. the division value is 0.1 °C.
4.3.2.3 Operating procedures
4.3.2.3.1 INSTALL the Wechsler balance; HANG the floating hammer onto the
small hook through the fine platinum wire; ROTATE the regulation screw to
make the two pointers align with each other.
4.3.3 Method 3.Density meter method
4.3.3.1 Method summary
From the depth of the density meter as immersed in the determination liquid
when it reaches to the equilibrium state, READ out the density of this liquid.
4.3.3.2 Instruments
4.3.3.2.1 Density meter. the division value is 0.001 g/cm3 (SEE Figure 6).
4.3.3.2.2 Constant temperature water bath. temperature controlled at (20 ±
0.1) °C.
4.3.3.2.3 Glass tube. 250 mL ~ 500 mL.
4.3.3.2.4 Thermometer (0 ~ 50) °C, the division value of 0.1 °C.
4.3.3.3 Operating procedures
4.3.3.4 Test results
4.3.3.4.1 The density ρt as determined at room temperature t °C is expressed
in gram per cubic centimeter (g/cm3) AND calculated in accordance with the
equation (8).
4.4 Determination of gas density
4.4.1 Method 1.Density bottle method
4.4.2.2 Instruments
4.4.2.2.1 Gas diffusers (SEE Figure 10).
4.4.2.2.2 Thermometer. (0 ~ 50) °C, AND the division value is 0.1 °C.
4.4.2.2.3 Stopwatch. the division value is 0.1 s.
4.4.2.3 Operating procedures
4.4.3 Result calculation
4.4.3.1 Under normal conditions, the relative density d of gas is calculated in
accordance with the equation (12).
4.4.3.3 The density ρ of the determination gas is expressed in grams per cubic
decimeter (g/dm3) AND calculated in accordance with the equation (15).
5 Test report
5.1 When reporting the density or relative density of products, it shall use the
units and symbols as specified in this standard.
5.2 When reporting the density of solid and liquid, it shall indicate temperature,
for example, density (20 °C). X X g/dm3.
5.5 When reporting the vapor relative density of gas or substance, it shall use
the following method. relative density (air = 1). X X; relative density of vapor
(air = 1). X X.
APPENDIX A
(Normative)
Calibration of the volume of the gas density bottle
The volume of the density bottle shall be calibrated at least once a year. During
calibration, CHARGE the clean air which slowly passes through the drying
tube into the density bottle; DETERMINE its mass m1 at room temperature and
atmospheric pressure. Full FILL it with water which is freshly boiled and cooled
to room temperature; WIPE it dry and USE filter paper to remove the water
from the ports of piston 1 and piston 2 (SEE Figure 7); MEASURE its mass m2.
RECORD the atmospheric pressure Pa and the room temperature t0; the
atmospheric pressure shall be accurate to 50 Pa, AND the room temperature
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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