4.1 Weathering is an inherently variable science because weather itself is variable. Додатно, even if all devices run the same exposure cycle, results from manually accelerated tests may vary. Стога, 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. Стога, 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 Standard Practice for Condition Regulation and Handling of Non-Metallic Materials for Natural and Artificial Climatic Testing

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1.1 This practice covers sample preparation, identification, паковање, transportation, 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 Овај стандард није намењен да реши све безбедносне проблеме, ако их има, повезана са његовом употребом. Одговорност корисника овог стандарда је да успоставе одговарајуће безбедносне и здравствене праксе и да утврде применљивост регулаторних ограничења пре употребе.

ASTM G147-2017 Standard Practice for Condition Regulation and Handling of Non-Metallic Materials for Natural and Artificial Climatic Testing

Белешка 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. ИСО 139 и ИСО 291 describe procedures for adjusting specimens before and during physical performance tests.

1.5 Овај међународни стандард је заснован на међународно признатим принципима стандардизације утврђеним Одлуком о принципима за израду међународних стандарда, Смернице и препоруке које је издао Комитет СТО за техничке баријере у трговини.