意味と使い方
4.1 化学物質の比較的急速な劣化, physical and mechanical properties of materials made from photodegradable plastics when exposed to light, heat and water after achieving their intended purpose. This practice is designed to cause changes in properties related to the conditions the material may encounter when discarded as garbage, 太陽光の影響も含めて, 水分, そして熱. The exposures used in this practice are not intended to simulate deterioration caused by local weather phenomena such as atmospheric pollution, 生物攻撃, そして塩水への曝露.

4.2 予防 – When operating conditions vary within the acceptable limits of this practice, results can be expected to change. したがって, reference to the use of this practice must not be made unless accompanied by a report prepared in accordance with section 9 使用される特定の動作条件の説明. For more information about the precautions that apply to using results obtained under this practice, see Practice G151.

注記 2: 変動の原因と設計の変動に対処する戦略に関する追加情報, 実行, および実験室加速曝露試験のデータ分析, see Guideline G141.

ASTM D5208-2022 蛍光紫外線の標準慣行

4.3 Simultaneous exposure to similar materials with known properties (コントロール) with the sample provides criteria for comparison purposes. The use of controls to rank the stability of test materials greatly improves consistency across different laboratories. It is recommended that at least three repetitions of the material for each evaluation be performed in order to statistically evaluate the results.

4.4 テスト結果は、G154 の実践に従って機器を操作する際の注意の度合いによって異なります。. Important factors include regulation of the line voltage, the temperature of the room in which the equipment is operating, 温度管理, and the condition and age of the lamp (if exposed in equipment without irradiance control).

半径
1.1 This procedure covers specific procedures applicable to fluorescent ultraviolet (紫外線) irradiation of photodegradable plastics in accordance with procedures G151 and G154. The practice also includes the preparation of test samples and the evaluation of test results.

1.2 Practice D4329 covers fluorescent UV exposure to plastics used for outdoor applications.

ASTM D5208-2022 蛍光紫外線の標準慣行

1.3 SI 単位で表された値は標準値として扱われます。. 括弧内の値は参考値です。.

1.4 この規格は、すべての安全上の懸念に対処することを目的としたものではありません, もしあれば, その使用に関連する. 適切な安全性を確立するのは、この規格のユーザーの責任です。, 健康および環境慣行を確認し、使用前に規制制限の適用可能性を判断するため.

注記 1: There is no known ISO equivalent to this standard.

1.5 この国際規格は、国際規格開発の原則に関する決定で確立された国際的に認められた標準化原則に基づいています。, WTO貿易の技術的障壁に関する委員会が発行したガイドラインと勧告.