HG/T 3055-2012Latex foam - Determination of apparent density (English PDF)
胶乳海绵表观密度测定
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Issued by
MIIT
Level / Type
Industry · Recommended
Issue date
December 28, 2012
Implementation date
June 1, 2013
Scope
HG/T 3055-2012 is the English-translated version of 胶乳海绵表观密度测定.
HG/T 3055-2012 is the Chinese chemical industry test method for the apparent density of latex foam, the mass per unit volume of foam made from natural or synthetic rubber latex. Mass is weighed on a balance accurate to better than 0.1% of the test piece, and volume is found in one of two ways depending on the shape of the piece. Regular pieces are simply measured and calculated using HG/T 3054, while irregular ones are placed in a glass jar and buried in linseeds, the seed level being read at six or more points around the jar before and after the piece is removed. Results come out in kilograms per cubic metre and a test report is required. It replaces HG/T 3055-1988, was issued on 28 December 2012 and has applied since 1 June 2013.
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Document preview — HG/T 3055-2012
National Standard of the People's Republic of China
- Replacing
- HG/T 3055-1988
Issued by: Ministry of Industry and Information Technology of the People's Republic of China
Contents
- Foreword3
- 1 Scope4
- 2 Normative references4
- 3 Term and definition4
- 4 Test instruments and materials4
- 5 Classification of samples5
- 6 Preparation of test pieces5
- 7 Test methods6
- 8 Results presentation6
- 9 Test report7
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:
rhoa - 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). […]
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Referenced standards
Normative references
Similar standards
Editions of HG/T 3055
| Edition | Title | Revision | Status |
|---|---|---|---|
| HG/T 3055-2012 | Latex foam - Determination of apparent density | current edition | Current |
| HG/T 3055-1988 | Latex foam - Determination of apparent density | previous edition | Superseded |
This page sells the current edition, HG/T 3055-2012. Earlier editions are listed for reference only.
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