HG/T 3055-2012 English PDF (HGT3055-2012)

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HG/T 3055-2012: Latex foam. Determination of apparent density
HG/T 3055-2012
HG
CHEMICAL INDUSTRY STANDARD OF
THE PEOPLE’S REPUBLIC OF CHINA
ICS 83.100
G 44
File No.: 38572-2013
Replacing HG/T 3055-1988
Latex foam - Determination of apparent density
ISSUED ON: DECEMBER 28, 2012
IMPLEMENTED ON: JUNE 01, 2013
Issued by: Ministry of Industry and Information Technology of the
People's Republic of China
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Term and definition ... 4
4 Test instruments and materials ... 4
5 Classification of samples ... 5
6 Preparation of test pieces ... 5
7 Test methods ... 6
8 Results presentation ... 6
9 Test report ... 7
Latex foam - Determination of apparent density
1 Scope
This Standard specifies the methods for the determination of apparent density
of latex foam.
This Standard applies to the determination of apparent density of foam products
made with natural rubber latex and synthetic rubber latex as the main raw
material.
2 Normative references
The following referenced documents are indispensable for the application of
this document. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any
amendments) applies.
HG/T 3054 Latex foam - Determination of linear dimensions
3 Term and definition
For the purpose of this document, the following term and definition apply.
apparent density
The mass of latex foam per unit volume under specified temperature and
humidity.
4 Test instruments and materials
4.1 Balance
The accuracy of the balance is less than 0.1 % of the mass of the test piece.
4.2 Measuring tool
It shall meet the requirements of HG/T 3054.
4.3 Linseeds
7 Test methods
7.1 Measurement of the mass of test pieces
Under the conditions of 6.3, use a balance (4.1) to weigh test pieces, in grams
(g).
7.2 Measurement of the volume of test pieces
Under the conditions of 6.3, use one of the following methods to measure the
volume of test pieces.
7.2.1 Method A
It is applicable to Category I test pieces. According to HG/T 3054, measure the
dimensions of the test piece and calculate the volume of the test piece, in cubic
millimeters (mm3).
7.2.2 Method B
It is applicable to Category II test pieces. PLACE a glass jar on the level
platform; PUT the test piece in the glass jar naturally; FILL the gap of the test
piece with linseeds until it covers about 2 cm of the test piece; MAKE the
surface of the linseeds flat; MEASURE the height of the surface of the linseeds
at six points (or more than six points) that are evenly distributed along the
circumference of the jar and TAKE the arithmetic average. After taking out the
test piece, USE the same method to measure the height of the surface of the
linseeds; CALCULATE the difference between the two measured volumes
before and after, that is, the volume of the test piece, in cubic millimeters (mm3).
8 Results presentation
The apparent density of test pieces is calculated by formula (1):
where:
ρa - the apparent density of the test piece, in kilograms per cubic meter
(kg/m3);
m - the mass of the test piece, in grams (g);
V - the volume of the test piece, in cubic millimeters (mm3).