GB/T 16422.4-2014 in English

《GB/T 16422.4-2014塑料 实验室光源暴露试验方法 第4部分：开放式碳弧灯》由TC15（全国塑料标准化技术委员会）归口，TC15SC5（全国塑料标准化技术委员会老化方法分会）执行，主管部门为中国石油和化学工业联合会。
GB/T16422的本部分规定了试样暴露在潮湿条件下的开放式碳弧灯试验方法,该方法用于模拟材料在实际使用环境中暴露于日光或经窗玻璃过滤后的日光下发生的自然老化效果。
本部分适用于在碳弧灯光源暴露条件下塑料的耐候性评定以及塑料间的耐候性对比试验。
试样在可控的环境条件(温度、潮湿)下暴露于过滤后的开放式碳弧灯。有多种滤光器可供选择。
特定材料的试样制备和结果评估参考其他的国家标准。
总则在 GB/T16422.1中给出

1 Scope

This part of GB/T 16422 specifies specifies methods for exposing specimens to open-flame carbon-arc lamps in the presence of moisture to reproduce the weathering effects that occur when materials are exposed in actual end-use environments in daylight or daylight filtered through window glass.

This part is applicable to the evaluation of weather resistance of plastics and the comparison test of weather resistance between plastics under the condition of carbon-arc light source exposure.

The specimens are exposed to filtered open-flame carbon-arc light under controlled environmental conditions (temperature, moisture). Various filters are described.

Specimen preparation and evaluation of the results are covered in other national standards for specific materials.

General guidance is given in GB/T 16422.1.

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.

GB/T 16422.1-2006 Plastics — Methods of Exposure to Laboratory Light Sources — Part 1: General Guidance (ISO 4892-1:1999, IDT)
ISO 4582 Plastics — Determination of Changes in Color and Variations in Properties after Exposure to Daylight under Glass, Natural Weathering or Laboratory Light Sources
ASTM G 152 Standard Practice for Operating Open Flame Carbon Arc Light Apparatus for Exposure of Nonmetallic Materials

3 Principle

3.1 Specimens of the materials to be tested are exposed to glass-filtered open-flame carbon-arc light, to heat and to moisture continuously or in repetitive cycles.
3.2 The exposure conditions may be varied by selection of:

a) the light filter;

b) the type of exposure to moisture/humidity;

c) the length of exposure to light and moisture/humidity;

d) the temperature of the exposure;

e) the relative lengths of the light and dark periods.

The effect of moisture is usually produced by controlling the humidity of the air or by spraying the test specimens with demineralized/deionized water or by condensation of water vapour onto the surfaces of the specimens.

3.3 The procedure may include measurements of the irradiance and radiant exposure at the surface of the specimens.

3.4 It is recommended that a similar material of known behaviour (a control) be exposed simultaneously with the test specimens to provide a reference standard for comparative purposes.

3.5 Intercomparison of results obtained from specimens exposed in different apparatus should not be made unless an appropriate statistical relationship has been established between the devices for the particular material tested.

Foreword II
1 Scope
2 Normative References
3 Principle
4 Apparatus
5 Test Specimens
6 Test Conditions
7 Procedure
8 Test Report
Bibliography