المعنى والاستخدام
4.1 قدرة المواد البلاستيكية على مقاومة التدهور الكهربائي, mechanical and optical properties due to exposure to light, heat and water is important for many applications. This practice is designed to cause changes in properties related to end-use conditions, including the effects of sunlight, moisture and heat. The exposures used in this practice are not intended to simulate deterioration caused by local weather phenomena, such as atmospheric pollution, biological attacks, and salt water exposure.

4.2 احتياطات – Results may change when operating conditions vary within the accepted limits of this practice. لذلك, 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. لمزيد من المعلومات حول الاحتياطات التي تنطبق على استخدام النتائج التي تم الحصول عليها بموجب هذه الممارسة, راجع الممارسة G151.

ملحوظة 2: For additional information on sources of variability and strategies to address variability in the design, execution, and data analysis of laboratory accelerated exposure tests, انظر الدليل G141.

4.2.1 The spectral power distribution of light from an open flame carbon arc is significantly different from that produced by light and water exposure devices using other carbon arc configurations or other light sources. The type and rate of degradation and performance rankings produced by exposure to filtered open flame carbon arcs may be very different from those produced by exposure to other types of laboratory light sources.

4.2.2 Inter-laboratory comparisons are valid only if all laboratories use the same type of carbon arc, filters and exposure conditions.

ASTM D1499-2021 ممارسة التعامل مع أجهزة التعرض وتفجير المياه (نوع قوس الكربون) للتعرض للبلاستيك

4.3 The reproducibility of test results between laboratories has been shown to be good when evaluating the stability of a material according to its performance class compared to other materials or controls. 5,6 لذلك, يوصى بشدة بالكشف عن مواد مماثلة ذات خصائص معروفة (ضوابط) في نفس الوقت مع مادة الاختبار. At least three repetitions of each material are recommended to enable statistical evaluation of the results.

4.4 Test results will depend on the degree of care taken to operate the equipment in accordance with practice G152. Important factors include regulation of line voltage, absence of salt or other water deposits, temperature and humidity control, and electrode conditions.

نصف القطر
1.1 This practice covers specific procedures and test conditions applicable to plastic exposure in filter open flame carbon arc installations conducted in accordance with Practices G151 and G152. The practice also includes the preparation of the sample, the test conditions suitable for the plastic, and the evaluation of the test results.

1.2 This practice does not include closed carbon arc exposure of plastics, which is allowed by practice D1499. Closed carbon arc exposure of plastics is described in practice D6360 and G153, where the requirements for exposure of non-metallic materials in a closed carbon arc device are set forth.

ASTM D1499-2021 ممارسة التعامل مع أجهزة التعرض وتفجير المياه (نوع قوس الكربون) للتعرض للبلاستيك

1.3 يجب التعامل مع القيم المعبر عنها بوحدات النظام الدولي كقيم قياسية. القيم الموجودة بين قوسين هي للإشارة فقط.

1.4 لا يهدف هذا المعيار إلى معالجة جميع المخاوف المتعلقة بالسلامة, لو اي, المرتبطة باستخدامه. تقع على عاتق مستخدمي هذه المواصفة القياسية مسؤولية تحديد السلامة المناسبة, الممارسات الصحية والبيئية وتحديد إمكانية تطبيق القيود التنظيمية قبل الاستخدام.

ملحوظة 1: This practice is technically equivalent to ISO 4892-4.

1.5 يعتمد هذا المعيار الدولي على مبادئ التقييس المعترف بها دوليًا المنصوص عليها في القرار المتعلق بمبادئ تطوير المعايير الدولية, المبادئ التوجيهية والتوصيات الصادرة عن لجنة منظمة التجارة العالمية المعنية بالحواجز الفنية أمام التجارة.