ISO 458-2-1985 Plastics Determination of stiffness in torsion of flexible materials Part 2 Application to plasticized compounds of homopolymers and copolymers o.pdf

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1、Norme internationale 45812 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION.MEKfiYHAPOfiHAR OPTAHM3ALWlR l-IO CTAHAPTbl3AlJklt4.ORGANISATION INTERNATIONALE DE NORMALlSATtON Plastiques - D6termination de la rigidit en torsion des plastiques souples - Partie 2 I Application aux compositions plastifiees

2、dhomopolym c) une eprouvette (3) depaisseur comprise entre 4 et 5 mm pour determiner la portion de courbe voisine du point 4 MPa. Toutes les eprouvettes doivent avoir 60 + 2 mm de longueur et 6,2 a 6,4 mm de largeur. NOTES 1 Dans le cas dun essai rapide, il est possible dutiliser une seule eprouvett

3、e dune epaisseur de 4 $I 5 mm pour tracer les portions de courbe enveloppant les points 23 MPa et 4 MPa. 2 Certaines propri indications specifiees dans le chapitre 8 de IISO 458/l; c) temperatures correspondant aux trois valeurs caracte- ristiques conventionnelles de la rigidite en torsion des com- positions PVC plastifiees : 300 MPa, 23 MPa et 4 MPa. 2

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