BS ISO 813:2016 pdf free

BS ISO 813:2016 pdf free.Rubber, vulcanized or thermoplastic一Determination of adhesion to a rigid substrate
When test pieces are to be made using one type of rubber and one type of adhesive system, a mould for several test pieces can be used. The inside mould dimension parallel to the longitudinal axis of the strip of substrate shall be 125 mm. The dimension corresponding to the transverse axis of the strip of substrate can be altered, depending on the number of test pieces to be prepared at a time. The dimension perpendicular to the longitudinal and transverse axes of the substrate can be altered, for instance using metal plates of various thicknesses, depending on the thickness of the substrate, in order to leave a depth of 6 mm±0,05 mm free for the rubber.
When only one test piece is to be made from a given rubber, a mould as specified in 5.2.1.1 shall be used, except that the dimension corresponding to the transverse axis shall be restricted to the width of the test piece.
From the rubber compound, cut slabs of sufficient thickness and of the required size for the mould (length 125 mm, width corresponding to the number of test pieces to be prepared) so as to ensure maximum pressure between the rubber and the substrate during the test piece preparation process.
In the case of a rubber bonded with a heat-curing adhesive, carry out the vulcanization and/or bonding by heating the mould under pressure in a suitable press for the time and at the temperature required by the system being investigated.
Take great care when removing the test pieces from the mould to avoid subjecting the bonded surfaces to undue stress before the test pieces have cooled.
NOTE When the substrate used is a thermoplastic material, the strip may, in some cases, need to be raised to a temperature above its softening point in order to ensure adhesion. When the substrate is a thermosetting polymer, the starting material may, in some cases, be a low-viscosity prepolymer at the test piece preparation temperature, whose polymerization is completed during the process. The mould and the moulding pressure will have to be adapted to such cases.BS ISO 813 pdf free download.