ASTM D 3361-2020 “Uji Paparan Busur Karbon Api Tanpa Filter pada Cat dan Pelapis Terkait”

Arti dan Tujuan
4.1 Untuk banyak aplikasi, the ability of a paint or coating to resist deterioration of physical and optical properties due to exposure to light, panas, and water may be very important. This practice aims to cause changes in attributes related to end-use conditions, including the effects of sunlight, kelembaban, and heat. The exposures used in this practice are not intended to model the deterioration caused by local weather phenomena such as atmospheric pollution, biological attack, and saline-water exposure.

4.2 CaveatsResults may change when different operating conditions are used. Karena itu, no reference to the use of this practice may be made unless accompanied by a report prepared under Section 10 describing the specific operating conditions used. See Practice G151 for details of the caveats applicable to the use of the results obtained under this practice.

Catatan 1: Untuk informasi tambahan tentang sumber variabilitas dan strategi mengatasi variabilitas dalam desain, eksekusi, and data analysis of laboratory accelerated exposure trials, lihat Panduan G141.

4.2.1 The spectral power profiles of light from unfiltered open flame carbon arcs are significantly different from those generated by light and water exposure devices using other carbon arc configurations or other light sources. The type and rate of degradation and performance ranking resulting from exposure to unfiltered open flame carbon arcs may be quite different from those resulting from exposure to other types of laboratory light sources. Secara umum, exposure in accordance with this protocol will produce degradation more rapidly than similar exposure in accordance with practice D822/D822M or D5031/D5031M and may result in different types of degradation.

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

ASTM D 3361-2020 “Uji Paparan Busur Karbon Api Tanpa Filter pada Cat dan Pelapis Terkait”

4.3 The reproducibility of test results between laboratories has been shown to be good when evaluating the stability of the material according to the performance class compared to other materials or controls. IV,5 Karena itu, it is highly recommended to expose similar materials with known properties (kontrol) bersamaan dengan materi tes. At least three replications of each material are recommended to allow statistical evaluation of the results.

4.4 Test results will depend on the degree of care with which the equipment is operated 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.

4.5 All exposures referred to in accordance with this practice shall include a complete description of the test period used.

Ruang lingkup
1.1 This specification covers the selection of test conditions for accelerated exposure testing of coatings and related products in unfiltered open-flame carbon arc installations in accordance with regulations G151 and G152. The practice also includes preparation of specimens, suitable test conditions for coatings, and evaluation of test results.

1.2 This practice covers the unfiltered open-flame carbon arc exposure of paints and associated coatings and covers the exposure period commonly referred to as thedew cycle”. Practice D822/D822M describes the filtered open flame carbon arc device and Practice D5031/D5031M describes the closed carbon arc exposure. Radiation from unfiltered open flame carbon arcs produces shorter wavelengths and higher levels of shortwaver radiation compared to filtered open flame or closed carbon arcs.

ASTM D 3361-2020 “Uji Paparan Busur Karbon Api Tanpa Filter pada Cat dan Pelapis Terkait”

1.3 Nilai yang dinyatakan dalam satuan SI atau satuan inci-pon harus diperlakukan secara terpisah sebagai nilai standar. Nilai yang ditentukan pada setiap sistem belum tentu sama; Karena itu, untuk memastikan kepatuhan terhadap standar, setiap sistem harus digunakan secara independen satu sama lain dan nilai-nilai dari kedua sistem tidak boleh digabungkan.

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

1.5 Standar internasional ini telah dikembangkan sesuai dengan prinsip-prinsip standardisasi yang diakui secara internasional yang ditetapkan dalam Keputusan Prinsip-Prinsip Pengembangan Standar Internasional, Pedoman dan Rekomendasi yang dikeluarkan oleh Komite Hambatan Teknis Perdagangan Organisasi Perdagangan Dunia.

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