ISO 48-6:2018 pdf free
ISO 48-6:2018 pdf free.Rubber, vulcanized or thermoplastic一Determination of hardness
This document specifies a method for the determination of the apparent hardness, expressed in International Rubber Hardness Degrees (IRHD), of vulcanized- or thermoplastic-rubber roller covers.
The method is similar in principle to the methods used for the determination of the hardness of rubber in ISO 48-2 in that it consists essentially of measuring the depth of penetration of a spherical indentor operating under a specified force, The apparatus used is similar to that described in ISO 48-2, having a base specifically designed for application to roller covers and similar curved surfaces.
NOTE With some rollers, there can be significant variation in the thickness of the rubber over the surface of the roller, which could affect the measured apparent hardness.
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 48-2:2018, Rubber; vulcanized or thermoplastic- Determination of hardness一Part 2: Hardness between 10 IRHD and 100 IRHD
ISO 23529, Rubber一General procedures for preparing and conditioning test pieces for physical test methods Whenever possible, the test shall be carried out at a standard laboratory temperature in accordance with ISO 23529. The product under test shall, if possible, be maintained under the test conditions for sufficient time to reach temperature equilibrium with the test environment. Where this is impracticable, the period of time and the conditions shall be as given in the product specification (see Note).
The base of the instrument shall have a hole below the plunger allowing free passage of the annular foot such that measurement may be made above or below the base.
The lower surface of the base shall be in the form of two cylinders parallel to each other and the plane of the base. The diameter of the cylinders and their distance apart shall be such as to locate and support the instrument on the curved surface to be tested (see Figure 1). Alternatively, the base may be fitted with feet movable in universal joints so that they adapt themselves to the curved surface.ISO 48-6 pdf free download.
