Standard Practice for Performing Accelerated Outdoor Weathering of Factory-Coated Embossed Hardboard Using Concentrated Natural Sunlight and a Soak-Freeze-Thaw Procedure

Importancia y uso:

5.1 The ability to quickly and accurately evaluate and predict long-term weathering performance of factory-applied coatings is of paramount importance in making sound business and technical decisions.

5.2 It is important to include control specimens of known field performance to determine the efficacy of this practice for specific substrate(s) and coating system(s). These control specimens may include materials known to possess acceptable and unacceptable field performance for the defect(s) under consideration.

5.3 Results derived from this practice are best used to compare the relative performance of materials tested at the same time in the same device.

5.4 The inclusion of control specimens and their resulting data will assist in dealing with test variability caused by seasonal or annual variations in important climatic factors.

5.5 Extensive research was performed during the development of this standard practice. This research showed that this practice is not useful for determination of quantitative acceleration factors. However, this practice is very useful for comparing the performance of different materials.

5.6 A minimum of two replicates for both control specimens and test specimens is recommended to allow statistical evaluation of results. Refer to Practice G169 for additional guidance on establishing the number of replicates.

Subcomité:

D01.27

Referida por:

G0090-23

Volúmen:

06.01

Número ICS:

79.060.20 (Fibre and particle boards)

Palabras clave:

accelerated weathering; factory coatings (hardboard); film integrity; hardboard (composition board siding);