4.1 Pelapukan pada dasarnya adalah ilmu yang dapat berubah karena cuaca itu sendiri dapat berubah. Selain itu, even if all devices run the same exposure cycle, results from manually accelerated tests may vary. Karena itu, all factors need to be controlled as much as possible to reduce the overall source of error.

4.2 Proper handling of samples is important to maintain the integrity of the material being evaluated. Damage to specimens due to improper handling and labeling can adversely affect the effectiveness of test procedures, resulting in loss of money and time. Improper handling can introduce non-standard procedures into the scheme, which can be a significant source of variability, adversely affecting the overall accuracy of the results obtained. Improper processing may also introduce bias in the obtained results.

4.3 The material will change even under seemingly benign conditioning conditions, especially if the sample has been exposed. Karena itu, it is necessary to minimize the number and length of non-test periods so that exposure is a cause for further changes.

ASTM G147-2017 Praktik Standar untuk Pengaturan Kondisi dan Penanganan Bahan Non-Logam untuk Pengujian Iklim Alami dan Buatan

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1.1 This practice covers sample preparation, identification, kemasan, angkutan, handling and conditioning before, during and after natural and artificial aging tests.

1.2 This practice includes detailed information on the conditioning of specimens after exposure and before examination. This practice also includes long-term storage of sample files.

1.3 Regulation in this practice does not refer to the specific act of exposing the specimen to weathering factors.

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

ASTM G147-2017 Praktik Standar untuk Pengaturan Kondisi dan Penanganan Bahan Non-Logam untuk Pengujian Iklim Alami dan Buatan

Catatan 1: There is no equivalent ISO standard describing procedures for the identification, transport, conditioning and handling of specimens used for natural or artificial ageing tests. ISO 139 dan ISO 291 describe procedures for adjusting specimens before and during physical performance tests.

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.