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pénétrabilité i l'aiguille à 25e astm—d—5
needle penetration at 25 »c astm d 5 lesi than 400 not less than 400 distillation residue astm d 1189 less than 60 "/„ (by weight) not les« than Λ0 % (by weight)
on peut ainsi obtenir les différences Δ bille-anneau et Δ pénétrabilité entre les couches supérieure et inférieure.
the difference between the ball-and-ring temperatures, namely the Δ ball-and-ring temperature value, and the difference in penetrability between the upper and lower layer, namely the Δ penetrability value, can be obtained in this manner.