GB/T 18830-2009 PDF English
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| GB/T 18830-2009 | English | 70 |
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Textiles - Evaluation for solar ultraviolet radiation protective properties
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| GB/T 18830-2002 | English | 319 |
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Textiles -- Evaluation for solar ultraviolet radiation protective properties
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GB/T 18830-2009: Textiles - Evaluation for solar ultraviolet radiation protective properties---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/GBT18830-2009
GB
NATIONAL STANDARD
ICS 59.080.01
W 55
Replacing GB/T 18830-2002
Textiles - Evaluation for solar ultraviolet radiation
protective properties
Issued on. JUNE 11, 2009
Implemented on. JANUARY 01, 2010
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Principles... 6
5 Instrument... 6
6 Preparation and conditioning of test specimen... 7
7 Program... 8
8 Calculation and result presentation... 8
9 Assessment and marking... 10
10 Test report... 11
Appendix A (Normative) Daylight spectral irradiance and erythema effect... 12
Foreword
The standard replaces GB/T 18830-2002 “Textiles - Evaluation for solar
ultraviolet radiation protective properties”.
As compared with GB/T 18830-2002, the main technical differences are as
follows.
- MODIFY the Chapter 8 “Calculation and result presentation”, ADD the
equation (4), (5), and (6);
- MODIFY the assessment indicators of UV protection products from “UPF >
30” to “UPF > 40”.
Appendix A of this standard is a normative appendix.
This standard was proposed by the China Textile Industry Association.
This standard shall be under the jurisdiction of the National Textile
Standardization Technical Committee Basic Standard Branch (SAC/TC 209 /SC
1).
The main drafting organizations of this standard. Hangzhou Paradise Umbrella
Group Co., Ltd., Textile Industry Standardization Institute.
The main drafters of this standard. Xu Lu, Zheng Yuying, Wang Qiwei, He
Lingjun, Zhao Chungui.
This Standard replaces the standard previously issued as follows.
- GB/T 18830-2002.
Textiles - Evaluation for solar ultraviolet radiation
protective properties
1 Scope
This standard specifies the test method for the solar UV radiation protective
properties of textiles, as well as the presentation, evaluation and marking of the
level of protection.
This standard applies to the assessment of the solar UV radiation protective
properties of textiles under the specified conditions.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) 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.
GB/T 6529 Textiles - Standard atmospheres for conditioning and testing
(GB/T 6529-2008, ISO 139.2005, MOD)
3 Terms and definitions
The following terms and definitions apply to this standard.
3.1
Solar ultraviolet radiation, UVR
It refers to the electromagnetic radiation at a wavelength of 280 nm ~ 400
nm.
3.2
Solar UV-A
It refers to the solar ultraviolet radiation at a wavelength of 315 nm ~ 400 nm.
3.3
Solar UV-B
It refers to the solar ultraviolet radiation at a wavelength of 280 nm ~ 315 nm.
3.4
Ultraviolet protection factor, UPF
It refers to the ratio between the ultraviolet radiation average effect as
calculated when the skin is unprotected AND the ultraviolet radiation average
effect as calculated when the skin has fabric protection.
3.5
Solar irradiance
E (λ)
It refers to the energy per unit area and unit wavelength as received on the
Earth from the sun, which is expressed in W • m-2 • nm-1.The UVR spectrum
as measured at the Earth's surface is 290 nm ~ 400 nm.
3.6
Erythema
The skin becomes red by a variety of physical or chemical actions.
4 Principles
USE the monochromatic or multicolored UV-rays to collect the total spectral
transmittance ray, determine the total spectral transmittance, AND calculate the
UV protection factor UPF value of the sample.
5 Instrument
5.1 UV light source
PROVIDE the UV radiation at a wavelength of 290 nm ~ 400 nm. Suitable UV
light sources include xenon arc lamps, deuterium lamps, and daylight
simulators.
5.2 Integrating sphere
The total pore area of the integrating sphere does not exceed 10% of the inner
surface area of the integrating sphere. The inner surface shall be coated with a
highly reflective matte material such as barium sulfate.
5.3 Monochromator
It is suitable for the measurement of the spectral bandwidth of 5 nm or less in
the wavelength range of 290 nm ~ 400 nm.
5.4 UV transmission filter
It only allows the transmission of the light less than 400nm AND there is no
fluorescence.
5.5 Test specimen holder
It is used to make the test specimen maintain flat in tension-free state OR pre-
tensioned state. This device shall not block the entrance of the integrating
sphere.
6 Preparation and conditioning of test specimen
6.1 Preparation of test specimens
For homogeneous material, it shall take at least 4 representative test
specimens AND it shall discard the fabrics within 5 cm to the fabric edge.
For nonhomogeneous materials with different color or structure, at least two
test specimens shall be tested for each color and each structure.
7 Program
7.1 PLACE the test specimen in front of the entrance of the integrating sphere,
and MAKE the fabric side away from the skin when wearing face to the UV light
source.
7.3 RECORD the transmittance between 290 nm ~ 400 nm, at least once every
5 nm.
8 Calculation and result presentation
8.1 General
USE the equation (1) to calculate the arithmetic average T (UVA) of the UVA
transmittance of each test specimen, CALCULATE its mean value T (UVA) AV,
and RETAIN two decimal places.
8.2 Homogeneous test specimen
USE the equation (4) to calculate the average UV protection factor UPFAV.
USE the equation (5) to calculate the standard deviation of UPF.
8.3 Non-homogeneous specimens
As for nonhomogeneous materials with different colors or structures, various
colors or structures shall be tested, with the lowest UPF value being the UPF
of the sample.
9 Assessment and marking
9.1 Assessment
If determined in accordance with this standard, if the UPF of the sample > 40
AND T(UVA)AV < 5%, it can be called as “UV protective products”.
9.2 Marking
UV protective products shall be marked on the label of the following information.
10 Test report
The report shall include the following.
Appendix A
(Normative)
Daylight spectral irradiance and erythema effect
Table 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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