Tôles perforées pour tamisage industriel — Partie 1: Épaisseur égale ou supérieure à 3 mm

Describes three patterns using round (circular) and square perforations in low carbon steel plate of 3 mm thickness and above. The sizes of holes range from 125 to 3.15 mm inclusive. Five ratios of pitch to hole are prescribed which result in nominal open areas ranging from about 64 to 23 %.