GB/T 3681.1-2021 English PDF (GBT3681.1-2021)

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GB/T 3681.1-2021: Plastics -- Methods of exposure to solar radiation -- Part 1: General guidance
GB/T 3681.1-2021
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 83.080.01
CCS G 31
GB/T 3681.1-2021 / ISO 877-1:2009
Partially replacing GB/T 3681-2011
Plastics - Methods of exposure to solar radiation - Part 1:
General guidance
(ISO 877-1:2009, IDT)
ISSUED ON: DECEMBER 31, 2021
IMPLEMENTED ON: JULY 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PRC.
Table of Contents
Foreword ... 3 
Introduction ... 5 
1 Scope ... 7 
2 Normative references ... 7 
3 Terms and definitions ... 8 
4 Principle ... 8 
5 Apparatus ... 9 
6 Test specimens ... 12 
7 Conditions of exposure of the test specimens ... 14 
8 Exposure stages ... 15 
9 Procedure ... 16 
10 Expression of results ... 18 
11 Test report ... 19 
Annex A (Informative) Classification of climates ... 21 
Bibliography ... 23 
Foreword
This document is drafted in accordance with GB/T 1.1-2020 "Directives for
standardization - Part 1: Rules for the structure and drafting of standardizing
documents".
This document is Part 1 of GB/T 3681 "Plastics - Methods of exposure to solar
radiation". GB/T 3681 has issued the following parts:
- Part 1: General guidance;
- Part 2: Direct weathering and exposure behind window glass.
This document, as the general guidance of GB/T 3681, replaces the general technical
content of relevant guidance test method A, method B and method C in GB/T 3681-
2011 "Plastics - Methods of exposure to direct weathering, to weathering using glass-
filtered daylight, and to intensified weathering by daylight using Fresnel mirrors".
Compared with GB/T 3681-2011, in addition to structural adjustment and editorial
changes, the main technical changes are as follows:
a) Change the content of "Terms and definitions" (see Clause 3; Clause 3 of the 2011
edition);
b) Change the specific requirements for inert materials and backings in "Apparatus"
(see 5.1; 5.1 of the 2011 edition);
c) Change the requirements for apparatus for measurement of radiant exposure and
its calibration, which shall comply with ISO 9370 (see 5.2.1; 5.5.1 of the 2011
edition);
d) Change the passband of total-ultraviolet radiometers from "300 nm ~ 400 nm" to
"290 nm ~ 400 nm" (see 5.2.1.4 and 8.3.2.3; 5.5.1.3 and 8.2.1.2 of the 2011
edition);
e) Change the content of "Other climate-measuring instruments" (see 5.2.2; 5.5.3 of
the 2011 edition);
f) Add "Conditions of exposure of the test specimens" and "Mounting of reference
materials" (see Clause 7 and 9.2);
g) Delete "Blue wool reference sample", "Mounting of pyranometer and material
standard", and "Use blue wool reference sample to test radiant exposure" (see
8.2.2, 9.2, Annex A of the 2011 edition);
h) Change the contents of "Expression of exposure stages" and "Climate conditions"
(see 10.2 and 10.3; 10.2 of the 2011 edition);
I) Add "Classification of climates" (see Annex A);
j) Delete “Climate divisions and climatic characteristics of China” (see Annex B of
the 2011 edition).
This document is identical to ISO 877-1:2009 "Plastics - Methods of exposure to solar
radiation - Part 1: General guidance".
The following minimal editorial changes have been made to this document:
- To explain the term "fillet", add Note 1 to 9.1;
- To provide the benchmark climate regions in China, add Note 2 to Table A.1 of
Annex A.
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority of this document shall not be held
responsible for identifying any or all such patent rights.
This document was proposed by China Petroleum and Chemical Industry Federation.
This document shall be under the jurisdiction of National Technical Committee 15 on
Plastic of Standardization Administration of China (SAC/TC 15).
Drafting organizations of this document: Guangzhou Research Institute of Synthetic
Materials, Beijing Tiangang Auxiliary Co., Ltd., Shandong Dawn Polymer Co., Ltd.,
Polyrocks Chemical Co., Ltd., Heilongjiang Xinda Enterprise Group Co., Ltd., Shaanxi
Yanchang Jingwei New Material Technology Industrial Park Co., Ltd.,
Guangdong Huabiao Testing Center Co., Ltd., Atlas Material Testing Technology Co.,
Ltd., Orinko Advanced Plastics Co., Ltd.
Main drafters of this document: Ma Mei, Liu Gang, Zhao Lei, Tie Wen'an, Zhu
Hongfang, Yang Xin, Xie Xinhong, Cheng Ge, Wu Luo, Li Jing, Chen Xintai, Tian
Xiaoyan, Zhang Yanli, Cao Lingling.
This document was first issued in 1983; and first revised in 2000. The second revision
in 2011 incorporated the content of GB/T 14519-1993 "Plastics - Method of exposure
to indirect weathering using glass-filtered daylight". This is the third revision.
Plastics - Methods of exposure to solar radiation - Part 1:
General guidance
1 Scope
This document provides information and general guidance on the selection and use of
the methods of exposure to solar radiation described in detail in GB/T 3681. These
methods of exposure to solar radiation are applicable to plastics materials of all kinds
as well as to products and portions of products.
This document also specifies methods for determining radiant exposure.
This document does not include direct weathering using black-box test fixtures, which
simulate higher end-use temperatures in some applications.
Note: ASTM G7 and ASTM D4141 describe black-box exposure tests.
2 Normative references
The contents of the following documents, through normative references in this text,
constitute indispensable provisions of this document. Among them, for dated references,
only the edition corresponding to that date applies to this document. For undated
references, the latest edition (including all amendments) applies to this document.
GB/T 3681.2-2021 Plastics - Methods of exposure to solar radiation - Part 2: Direct
weathering and exposure behind window glass (ISO 877-2:2009, IDT)
ISO 291 Plastics - Standard atmospheres for conditioning and testing
Note: GB/T 2918-2018 Plastics - Standard atmospheres for conditioning and testing (ISO
291:2008, MOD)
ISO 472 Plastics - Vocabulary
Note: GB/T 2035-2008 Terms and definitions for plastics (ISO 472:1999, IDT)
ISO 877-3 Plastics - Methods of exposure to solar radiation - Part 3: Intensified
weathering using concentrated solar radiation
ISO 2818 Plastics - Preparation of test specimens by machining
Note: GB/T 39812-2021 Plastics - Preparation of test specimens by machining (ISO 2818:2018,
IDT)
ISO 4582 Plastics - Determination of changes in colour and variations in properties
after exposure to glass-filtered solar radiation, natural weathering or laboratory
radiation sources
Note: GB/T 15596-2021 Plastics - Determination of changes in colour and variations in
properties after exposure to glass-filtered solar radiation, natural weathering or laboratory
radiation sources (ISO 4582:2017, IDT)
ISO 4892-1 Plastics - Methods of exposure to laboratory light sources - Part 1:
General guidance
Note: GB/T 16422.1-2019 Plastics - Methods of exposure to laboratory light sources - Part 1:
General guidance (ISO 4892-1:2016, IDT)
ISO 9370 Plastics - Instrumental determination of radiant exposure in weathering
tests - General guidance and basic test method
ASTM G179 Standard Specification for Metal Black Panel and White Panel
Temperature Devices for Natural Weathering Tests
ASTM G183 Standard Practice for Field Use of Pyranometers, Pyr...