Significato e uso
4.1 I materiali realizzati con plastica fotodegradabile si deteriorano rapidamente se esposti alla radiazione solare, ossigeno, Calore, moisture and other weather-degrading elements. This practice is used to assess the photodegradability of plastics when exposed to devices that produce simulated daylight (1,2) 6 and control temperature and humidity. 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. Positive correlation of exposure results between this device and other laboratory aging devices is not possible.

4.2 Changes in results can be expected when operating conditions vary within the accepted limits of this practice. Perciò, all test results using this specification need to be accompanied by the specific operating conditions required in Section 9. For more information about the precautions that apply to using results obtained under this practice, see Practice G151.

4.3 The results of laboratory exposure cannot be directly extrapolated to estimate the absolute rate of environmental degradation, as the acceleration factor depends on the material and can vary greatly for each material and different formulations of the same material. Tuttavia, exposure to similar materials with known outdoor properties, controls, and simultaneously with test samples allows comparison of durability under test conditions relative to controls. The evaluation of relative durability also greatly improves the consistency of test results between different laboratories (3).

4.4 Test results will depend on the degree of care taken to operate the equipment in accordance with practice G155. Fattori importanti includono la regolazione della tensione di linea, assenza di sale o altri depositi di acqua, controllo della temperatura e dell'umidità, and condition and age of burners and filters.

Nota 2: Per ulteriori informazioni sulle fonti di variabilità e sulle strategie per affrontare la variabilità nella progettazione, esecuzione, e analisi dei dati di prove di esposizione accelerata in laboratorio, see Guideline G141.

4.5 Before continuing this practice, it is common practice to refer to the specifications of the material under test. Any sample preparation, regolazione, sizing, or test parameter or combination thereof covered in the Material Specification shall take precedence over the sample preparation, regolazione, sizing, or test parameter or combination thereof referred to in this specification. If there is no material specification, default conditions apply.

Metodo di prova standard ASTM D5071-2022 per i test di esposizione di plastiche fotodegradabili in dispositivi con lampade allo xeno:

Raggio
1.1 This procedure covers specific procedures and test conditions applicable to xenon arc exposure of photodegradable plastics in accordance with practices G151 and G155. The practice also includes the preparation of samples, suitable test conditions for photodegradable plastics, e valutazione dei risultati dei test.

1.2 Questo standard non è destinato ad affrontare tutti i problemi di sicurezza, se presente, legati al suo utilizzo. È responsabilità degli utenti di questo standard stabilire una sicurezza adeguata, pratiche sanitarie e ambientali e per determinare l'applicabilità delle restrizioni normative prima dell'uso.

Nota 1: This practice is technically equivalent to ISO 4892-2 and Practice D2565, which covers xenon arc exposure of long-term plastics for outdoor applications.

1.3 Questo standard internazionale si basa su principi di standardizzazione riconosciuti a livello internazionale stabiliti nella Decisione sui principi per lo sviluppo di standard internazionali, Linee guida e raccomandazioni emesse dal comitato dell'OMC sugli ostacoli tecnici al commercio.