This part is developed in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 3903.7-2005 Footwear - Ageing conditioning, and the following main technical changes have been made with respect to GB/T 3903.7-2005:
——The normative references are modified (see Clause 2, Clause 2 of Edition 2005);
——The terms and definitions are modified (see Clause 3, Clause 3 of Edition 2005);
——The test report is modified (see Clause 8, Clause 8 of Edition 2005);
——The word "heat ageing" is changed to "dry heat ageing" in the text; and the word "humidified ageing" is changed to "damp-heat ageing".
This part, by means of translation, is identical to ISO 20870: 2017 Footwear - Ageing conditioning.
The Chinese documents identical to the normative international documents given in this part are as follows:
——GB/T 22049-2019 Footwear - Standard atmospheres for conditioning and testing of footwear and components for footwear (ISO 18454: 2018, IDT);
——GB/T 22050-2008 Footwear - Sampling location, preparation and duration of conditioning of samples and test pieces (ISO 17709: 2004, IDT).
The following editorial changes have been made in this part:
——To be consistent with the existing standard series in China, the standard is renamed as Footwear - Test methods for whole shoe - Ageing conditioning.
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 part was proposed by China National Light Industry Council.
This part is under the jurisdiction of SAC/TC 305 National Technical Committee on Footwear of Standardization Administration of China.
The previous edition replaced by this part is as follows:
——GB/T 3903.7-2005.
Footwear - Test methods for whole shoe - Ageing conditioning
1 Scope
This part of GB/T 3903 specifies test methods which are intended to imitate the effects of naturally occurring reactions. The physical properties of interest are measured before and after the application of the ageing conditioning. The effect of the ageing conditioning on any of the physical properties of the material may be determined.
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.
ISO 17709 Footwear - Sampling location, preparation and duration of conditioning of samples and test pieces
ISO 18454 Footwear - Standard atmospheres for conditioning and testing of footwear and components for footwear
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 17709 and ISO 18454 apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
——ISO Online browsing platform: available at https: //www.iso.org/obp
——IEC Online browsing platform: http: //www.electropedia.org/
4 Test apparatus and materials
4.1 Dry heat ageing test
4.1.1 Oven, with forced circulation system, capable of maintaining the temperature within (70 ± 2)℃.
4.2 Damp heat ageing test
4.2.1 Ageing apparatus, of such a size that the total volume of test pieces does not exceed 10% of the free air space, and such that the test pieces are free to stretch, and exposed to the ageing atmosphere on all sides and not exposed to light.
4.2.2 Glass vessel, with a suitable plug for maintaining the test pieces at a relative humidity of 100%, and a water-bath or oven for heating the vessel, capable of maintaining the temperature at (70±2)℃.
5 Sampling and conditioning
The number, size and shape of the test pieces shall be determined according to the nature of the test, and sampling shall be done in accordance with ISO 17709 before the ageing test, with the dimensions defined in the particular test.
6 Test procedure
After conditioning, the physical properties shall be determined, and the test pieces shall be brought rapidly to the ageing condition. The duration of dry heat ageing and of damp heat ageing is (168±2) h.
At the end of the ageing treatment, condition for 24 h according to ISO 18454 before testing.
Foreword i
1 Scope
2 Normative references
3 Terms and definitions
4 Test apparatus and materials
5 Sampling and conditioning
6 Test procedure
7 Expression of results
8 Test report
ICS 61.060
Y 78
中华人民共和国国家标准
GB/T 3903.7—2019/ISO 20870：2017
代替GB/T 3903.7—2005
鞋类 整鞋试验方法 老化处理
Footwear—Test methods for whole shoe—Ageing conditioning
(ISO 20870：2017，Footwear—Ageing conditioning，IDT)
2019—08—30发布 2020—03—01实施
国家市场监督管理总局
中国国家标准化管理委员会
发布
前言
本部分按照GB/T 1.1—2009给出的规则起草。
本部分代替GB/T 3903.7—2005《鞋类通用试验方法 老化处理》，与GB/T 3903.7—2005相比，主要技术变化如下：
——修改了规范性引用文件(见第2章，2005年版的第2章)；
——修改了术语和定义(见第3章，2005年版的第3章)；
——修改了试验报告(见第8章，2005年版的第8章)；
——全文将“加热老化”修改为“干热老化”；“加湿老化”修改为“湿热老化”。
本部分使用翻译法等同采用ISO 20870：2017《鞋类 老化处理》。
与本部分中规范性引用的国际文件有一致性对应关系的我国文件如下：
——GB/T 22049—2019 鞋类 鞋类和鞋类部件环境调节及试验用标准环境(ISO 18454：2018，IDT)；
——GB/T 22050—2008鞋类 样品和试样的取样位置、准备及环境调节时间(ISO 17709：2004，IDT)。
本部分做了下列编辑性修改：
——为与现有标准系列一致，将标准名称修改为《鞋类 整鞋试验方法 老化处理》。
请注意本文件的某些内容可能涉及专利。本文件的发布机构不承担识别这些专利的责任。
本部分由中国轻工业联合会提出。
本部分由全国制鞋标准化技术委员会(SAC/TC 305)归口。
本部分所代替标准的历次版本发布情况为：
——GB/T 3903.7—2005。
鞋类 整鞋试验方法 老化处理
1 范围
GB/T 3903的本部分规定了模拟自然发生反应效果的试验方法。老化处理前后分别测定试样的物理性能。老化处理对试样任何物理性能的影响都可能会测定出来。
2规范性引用文件
下列文件对于本文件的应用是必不可少的。凡是注日期的引用文件，仅注日期的版本适用于本文件。凡是不注日期的引用文件，其最新版本(包括所有的修改单)适用于本文件。
ISO 17709 鞋类 样品和试样的取样位置、准备及环境调节时间(Footwear—Sampling location，preparation and duration of conditioning of samples and test pieces)
ISO 18454 鞋类 鞋类和鞋类部件环境调节及试验用标准环境(Footwear—Standard atmospheres for conditioning and testing of footwear and components for footwear)
3术语和定义
ISO 17709和ISO 18454界定的术语和定义适用于本文件。
ISO和IEC标准化术语数据库地址如下：
——ISO在线浏览：https：//www.iso.org/obp
——IEC在线浏览：http：//www.electropedia.org/
4试验设备和材料
4.1干热老化试验
4.1.1 烘箱，有强制循环系统，能将温度保持在(70±2)℃范围内。
4.2湿热老化试验
4.2.1 老化试验设备，其尺寸应保证试样的总体积不超过自由空气空间的10％。试样完全自由伸张，试样所有部分均处于老化空气中，避光放置。
4.2.2玻璃容器，有合适塞子的玻璃容器放置试样，能使待测试样在相对湿度为100％的空气中，用水浴锅或者烘箱来加热此玻璃容器，保持其温度在(70±2)℃。
5取样和环境调节
试样数量、尺寸和形状的选取根据试验的性质来决定，在老化试验前按ISO 17709规定的特定试验的试样尺寸进行取样。
6试验步骤
在环境调节后进行物理性能的测定，然后试样应立即放置到老化环境中。干热老化过程和湿热老化过程的时间均为(168±2)h。
老化处理后、试验前按ISO 18454对试样进行24 h的调节。
7试验结果表达
试样性能的变化率X以百分数(％)表示，按式(1)计算：
(1)
式中：
——老化后的平均性能值；
——老化前的平均性能值。
8试验报告
试验报告应包括以下内容：
a)本部分编号；
b)详细描述试样性质；
c) 本试验方法的参考；
d)试验结果，按第7章表示；
e) 说明是干热老化试验还是湿热老化试验；
f) 在老化前后测定其单独性能，在适当的情况下，用百分比表示性能的变化；
g)试验日期；
h)试验过程中观察到的标准环境情况。
