4.1 天気自体が変化しやすいため、風化は本質的に変化しやすい科学です。. 加えて, even if all devices run the same exposure cycle, results from manually accelerated tests may vary. したがって, 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. したがって, 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 自然および人工気候試験における非金属材料の条件規制および取り扱いに関する標準実務

半径
1.1 This practice covers sample preparation, identification, 梱包, 交通機関, 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 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. 適切な安全衛生慣行を確立し、使用前に規制上の制限の適用可能性を判断することは、この規格のユーザーの責任です。.

ASTM G147-2017 自然および人工気候試験における非金属材料の条件規制および取り扱いに関する標準実務

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

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.