ISO 289-1:2015 pdf free

ISO 289-1:2015 pdf free.Rubber, unvulcanized – Determinations using a shearing-disc viscometer
It is permissible to use a smaller rotor where high viscosity makes this necessary. This small rotor shall have the same dimensions as the large rotor except that the diameter shall be 30,48 mm±0,03 mm. Results obtained with the small rotor are not identical with those obtained using the large rotor.
The two dies forming the cavity shall be formed from non-deforming unplated hardened steel of minimum Rockwell hardness 60 HRC (see ISO 6508-1). The dimensions of the cavity are given in Figure 1 and shall be measured from the highest surfaces. For good heat transfer, each die should preferably be made from only one piece of steel. The flat surfaces shall have radial V-grooves to prevent slippage. The grooves shall be spaced radially at 20° intervals and shall extend from an outer circle of diameter 47 mm to an inner circle of diameter 7 mm for the upper die and to within 1,5 mm of the hole in the lower die. Each groove shall form a 90° angle in the die surface with the bisector of the angle perpendicular to the surface and shall be 1,0 mm±0,1 mm wide at the surface (see Figure 2).
The rotor shall be fabricated from non-deforming unplated hardened steel of minimum Rockwell hardness 60 HRC. The rotor surfaces shall have rectangular-section grooves 0,80 mm±0,02 mm wide, of uniform depth 0,30 mm±0,05 mm, and spaced 1,60 mm±0,04 mm apart (distance between central axes). The flat surfaces of the rotor shall have two sets of such grooves at right angles to each other (see Figure 3). The edge of the rotor shall have vertical grooves of the same dimensions. The large rotor shall have 75 vertical grooves and the small rotor shall have 60. The rotor is fastened at right angles to a shaft having a diameter of 10 mm±1 mm and a length such that, in the closed die cavity, the clearance above the rotor does not differ from that below by more than 0,25 mm. The rotor shaft shall bear on the spindle which turns the rotor shaft not on the wall of the die cavity. The clearance at the point where the rotor shaft enters the cavity shall be small enough to prevent the rubber from leaving the cavity. A grommet, 0-ring, or other sealing device can be used as a seal at this point.ISO 289-1 pdf download.