Signification et utilisation

5.1 Les tests de vieillissement naturel peuvent prendre des années, and accelerated weathering assessments often take weeks or months to obtain useful data. Associating board selection with desired weatherability characteristics helps paint experimenters maximize information over the desired time frame.

5.2 Because exposure testing requires a long time span, the importance of planning robust experiments while controlling for as many variables as possible cannot be overstated. Pour cette raison, it is very important to choose a test board made of a representative wood species or composite, grade of wood and type of surface intended to be painted.

5.3 This practice can be used with any type of exterior architectural paint for wood or wood composite substrates, such as exterior paint, primer, wood colorant or water repellent.

ASTM D7787-13 Pratique standard pour la sélection de substrats en bois pour l'évaluation de la résistance aux intempéries des revêtements architecturaux

Étape 1: Portée

1.1 This practice provides guidelines for the selection of wood or wood composite substrates for evaluating specific weatherability characteristics of architectural coatings such as exterior coatings, primers and deck finishes.

1.2 The procedure includes selection of wood species and selection of individual wood test boards by visual inspection of wood characteristics.

1.3 This practice is designed to cover wood substrates commonly used in weathering research for architectural coatings. It is not intended as a comprehensive guide for all wood species and can be used to assess the weatherability characteristics of architectural coatings.

1.4 Les valeurs exprimées en unités SI ou en unités pouces-livres doivent être traitées séparément comme valeurs standard.. The values stated in each system may not be exactly equivalent; Donc, chaque système doit être utilisé indépendamment. Combining values from two systems can result in non-compliance.

1.5 Cette norme n'est pas destinée à répondre à tous les problèmes de sécurité (si seulement) associé à son utilisation. Il est de la responsabilité des utilisateurs de cette norme d'établir des pratiques de sécurité et de santé appropriées et de déterminer l'applicabilité des restrictions réglementaires avant utilisation..