GB/T 2410-2008 PDF English
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| GB/T 2410-2008 | English | 70 |
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Determination of the Luminous Transmittance and Haze of Transparent Plastics
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| GB/T 2410-1980 | English | RFQ |
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Transparent plastics--Transmissivity and haze test
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GB/T 2410-2008: Determination of the Luminous Transmittance and Haze of Transparent Plastics---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/GBT2410-2008
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.01
G 31
Replacing GB/T 2410-1980
Determination of the Luminous Transmittance and
Haze of Transparent Plastics
Issued on. AUGUST 4, 2008
Implemented on. APRIL 1, 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... 4
2 Normative References... 4
3 Terms and Definitions... 4
4 Samples... 5
5 State Conditioning... 5
6 Test Environment... 5
7 Test Methods... 5
8 Test Report... 11
Appendix A (informative) Derivation of Haze Calculation Formula... 12
Foreword
The modification of this Standard adopts ASTM D 1003.2007 Standard Test Method
for Haze and Luminous Transmittance of Transparent Plastics. Its technical content is
basically equivalent to this Standard. There are merely editorial modifications in the
text. Its compiling method is completely corresponding with this Standard.
This Standard serves as a replacement of GB/T 2410-1980 Transparent Plastics -
Transmissivity and Haze Test. In comparison with GB/T 2410-1980, there are several
main changes as follows.
---State conditioning is added;
---The tolerance of test temperature is modified from ± 5 °C into ± 2 °C;
---The tolerance of relative humidity is modified from ± 20% into ± 10%;
---Light source A is added;
---Sample thickness measurement accuracy is modified;
---Spectrophotometry is added;
---Appendix A “Derivation of Haze Calculation Formula” is added.
In this Standard, Appendix A is informative.
This Standard was proposed by China Petroleum and Chemical Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee 15 on
Plastic of Standardization Administration of China (SAC/TC 15).
The responsible drafting organization of this Standard. National Chemical Building
Materials Testing Center of SINOPEC Beijing Research Institute of Chemical Industry
(Material Testing Department).
The participating drafting organizations of this Standard. National Synthetic Resin
Quality Supervision and Inspection Center; China National Center for Quality
Supervision & Test of Plastic Products (Fuzhou); Guangzhou KINGFA Science &
Technology Co., Ltd.
The main drafters of this Standard. Panying, Liuchang, Liu Yuchun, Zhengning,
Hepeng, Cai Tongmin.
The release of the previous versions of the standard replaced by this Standard is as
follows.
---GB/T 2410-1980.
Determination of the Luminous Transmittance and
Haze of Transparent Plastics
1 Scope
This Standard stipulates two methods for the determination of luminous transmittance
and haze of transparent plastics. Method A is haze meter method. Method B is
spectrophotometry.
This Standard is applicable to the determination of luminous transmittance and haze
of transparent plastics in plate, sheet and thin-film state.
2 Normative References
Through the reference in this Standard, clauses of the following documents become
clauses of this Standard. In terms of references with a specific date, all the subsequent
modification sheets (excluding the corrected content) or the revised editions are not
applicable to this Standard. However, all parties that reach an agreement in
accordance with this Standard are encouraged to explore the possibility of adopting
the latest version of these documents. In terms of references without a specific date,
the latest version is applicable to this Standard.
GB/T 2918-1998 Plastics - Standard Atmospheres for Conditioning and Testing (idt
ISO 291.1997)
3 Terms and Definitions
The following terms and definitions are applicable to this Standard.
3.1 Haze
Haze refers to the ratio of scattered light flux (which deviates from the direction of
incident light through transmittance on the sample) to transmitted light flux. It shall be
expressed in percentage (in terms of this method, scattered light flux which deviates
from the direction of incident light by over 2.5 shall merely be used in the calculation
of haze).
4 Samples
4.1 Requirements
Samples cannot have defects that would affect material performance or defects that
would cause deviations in research.
4.2 Shapes and Dimensions
Sample dimensions shall be sufficiently large to cover the entrance window of
integrating sphere. It is recommended that sample shall be circular pieces with the
diameter of 50 mm, or, 50 mm 50 mm square pieces.
5 State Conditioning
Under the temperature of 23 °C ± 2 °C and the relative humidity of 50% ± 10%, in
accordance with GB/T 2918-1989, conduct state conditioning for not less than 40 h,
then, proceed with the test.
6 Test Environment
Test shall be conducted in the same environment as sample state conditioning.
7 Test Methods
7.1 Method A. Haze Meter Method
7.1.1 Instrument
The geometric performance and optical performance of the instrument shall comply
with the requirements in this Part. The principle of the instrument is shown in Figure 1.
7.1.2 Test procedures
7.1.2.1 Sample dimensions
Measure the thickness of the sample. When thickness is less than 0.1 mm, the
measurement shall at least be accurate to 0.001 mm. When thickness is more than
0.1 mm, the measurement shall at least be accurate to 0.01 mm.
7.1.3 Result calculation and expression
7.1.3.1 Luminous transmittance
In terms of each sample, luminous transmittance, expressed in percentage, shall be
calculated in accordance with Formula (1).
7.2 Method B. Spectrophotometry
7.2.1 Instrument
The geometric performance and optical performance of the instrument shall comply
with the requirements in this Part. The principle of the instrument which adopts non-
vertical illumination and diffused reception is shown in Figure 2.
7.2.2 Test procedures
Comply with 7.1.2, unless there are operation instructions provided by instrument
manufacturers.
7.2.3 Result calculation and expression
Calculate in accordance with 7.1.3, unless the instrument can automatically calculate
the luminous transmittance and haze.
8 Test Report
Test report shall include the following content.
Appendix A
(informative)
Derivation of Haze Calculation Formula
A.1 Haze formula shall be derived through the following two steps.
A.1.1 Luminous transmittance
Luminous transmittance, which is expressed in percentage, shall be calculated in
accordance with Formula (A.1).
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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