This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by the China National Textile and Apparel Council.
This document is under the jurisdiction of the National Technical Committee on Textiles of Standardization Administration of China (SAC/TC 302).
Home textiles - Determination of the light blocking effect of fabric - Illuminometer method
1 Scope
This document describes the test method for the determination of the light blocking effect of fabric by an illuminometer.
This document applies to various textiles and related products.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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.
GB 6529 Textiles - Standard atmospheres for conditioning and testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
light blocking effect
ability of textiles to block light transmission
Note: It is expressed in terms of light blocking rate.
3.2
illuminance
quotient of the luminous flux incident on an element containing the point divided by the area of the element
Note: The unit is lux (lx).
[Source: GB 50034-2013, 2.0.6, modified]
4 Principle
The stable light with certain intensity is irradiated on the surface of the sample, and the illumination after the light passes through the sample is measured and compared with the illumination without the sample. The light blocking effect of the fabric is characterized by calculating the light blocking rate of the sample.
Foreword i 1 Scope 2 Normative references 3 Terms and definitions 4 Principle 5 Test method 6 Test report Bibliography
Foreword
This document is developed in accordance with the rules given in GB/T 1.1-2020 Directives for standardization - Part 1: Rules for the structure and drafting of standardizing documents.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This document was proposed by the China National Textile and Apparel Council.
This document is under the jurisdiction of the National Technical Committee on Textiles of Standardization Administration of China (SAC/TC 302).
Home textiles - Determination of the light blocking effect of fabric - Illuminometer method
1 Scope
This document describes the test method for the determination of the light blocking effect of fabric by an illuminometer.
This document applies to various textiles and related products.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions 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.
GB 6529 Textiles - Standard atmospheres for conditioning and testing
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
light blocking effect
ability of textiles to block light transmission
Note: It is expressed in terms of light blocking rate.
3.2
illuminance
quotient of the luminous flux incident on an element containing the point divided by the area of the element
Note: The unit is lux (lx).
[Source: GB 50034-2013, 2.0.6, modified]
4 Principle
The stable light with certain intensity is irradiated on the surface of the sample, and the illumination after the light passes through the sample is measured and compared with the illumination without the sample. The light blocking effect of the fabric is characterized by calculating the light blocking rate of the sample.
Contents of GB/T 42999-2023
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Test method
6 Test report
Bibliography
