Arti dan kegunaannya
4.1 Kerusakan bahan kimia yang relatif cepat, 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, including the effects of sunlight, kelembaban, and heat. The exposures used in this practice are not intended to simulate deterioration caused by local weather phenomena such as atmospheric pollution, serangan biologis, dan paparan air asin.

4.2 Tindakan pencegahan – When operating conditions vary within the acceptable limits of this practice, results can be expected to change. Karena itu, reference to the use of this practice must not be made unless accompanied by a report prepared in accordance with section 9 describing the specific operating conditions used. For more information about the precautions that apply to using results obtained under this practice, see Practice G151.

Catatan 2: Untuk informasi tambahan tentang sumber variabilitas dan strategi mengatasi variabilitas dalam desain, eksekusi, and data analysis of laboratory accelerated exposure trials, see Guideline G141.

Praktik Standar ASTM D5208-2022 untuk Sinar Ultraviolet Fluoresen

4.3 Simultaneous exposure to similar materials with known properties (kontrol) 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 Hasil pengujian akan bergantung pada tingkat kehati-hatian dalam mengoperasikan peralatan sesuai dengan praktik G154. Important factors include regulation of the line voltage, the temperature of the room in which the equipment is operating, pengatur suhu, and the condition and age of the lamp (if exposed in equipment without irradiance control).

Radius
1.1 This procedure covers specific procedures applicable to fluorescent ultraviolet (UV) 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.

Praktik Standar ASTM D5208-2022 untuk Sinar Ultraviolet Fluoresen

1.3 Nilai yang dinyatakan dalam satuan SI harus diperlakukan sebagai nilai standar. Nilai yang diberikan dalam tanda kurung hanya untuk referensi.

1.4 Standar ini tidak dimaksudkan untuk mengatasi semua masalah keselamatan, jika ada, terkait dengan penggunaannya. Merupakan tanggung jawab pengguna standar ini untuk menetapkan keselamatan yang sesuai, praktik kesehatan dan lingkungan dan untuk menentukan penerapan pembatasan peraturan sebelum digunakan.

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

1.5 Standar internasional ini didasarkan pada prinsip-prinsip standardisasi yang diakui secara internasional yang ditetapkan dalam Keputusan Prinsip-Prinsip Pengembangan Standar Internasional, Pedoman dan Rekomendasi yang dikeluarkan oleh Komite WTO tentang Hambatan Teknis Perdagangan.