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Table 1 Reference values of adhesion upper/soles, according to standard EN 20344

From: Importance of the surface treatment in the peeling strength of joints for the shoes industry

Shoes Peel strength per unit width (upper/sole)
Baby ≥ 2 N/mm
Child ≥ 4 N/mm
Woman ≥ 3 N/mm
Man ≥ 4 N/mm