ASTM D2240:15 pdf free download – Standard Test Method for Rubber Property- -Durometer Hardness.
5.1.2.3 Operating Stand, 2 (indentor to specimen type). shall be capable of applying the indentor to the specimen in a nanner that minimizes shock.
5.1.2.4 Operating Sta,id, i:pe 3 (indentor to specimen type). hydraulic dampening, pneumatic dampening. or elcctromechinical (required 11r the operation of Type M duromeicrs) shall be capable of controlling the rate of descent of the indetior to the specimen at a maximum of 3.2 mm/s (0.125 in./s) and applying a force sufficient to overcome the calibrated spring force as shown in Table 1. Manual application. Type 1 or Type 2 operating stands are not acceptable for Type M duroneter operation.
5.1.2.5 The entire instrument should be plumb and level, and resting on a surface that will minimize vibration. Operating the irstrument under adverse conditions will negatively affect the determinations attained.
5. I .2.6 Specimen Support Table, (Fig. 3) integral to the opering stand, arwi having a solid flat surface. support platform may have orifices designed to accept various inserts or support fixtures (Fig. 3) to provide for the support of irregularly configured specimens. When inserts are used to support test specimens, care must he taken to align the indcntor to the center of thc insert, or the point at which the indentor is to contact the specimen. Care should be exercised to assure that the indentor does not abruptly contact the specimen support table as damage to the indentor may result.
6. Test Specimen
6.1 The test specimen, herein referred to as “specimen” or “test specimen” interchangeably, shall he at least 6.0 mm (0.24 in.) in thickness unless it is known that results equivalent to the 6.0-mm (0.24-in.) values arc obtained with a thinner specimen.
6.1.1 A spccimcn may he composed of plied pieces to obtain the necessary thickness, but determinations made on such specimens may not agree with those made Ofl solid specimens. as the surfaces of the plied spec imens may not be in complete contact. The lateral dimensions of the specimen shall he sufficient to permit measurements at least 12.0 mm (0.48 in.) from any edge, unless it is known that identical results are obtained when measurements are made at a lesser distance from an edge.
support platform may have orifices designed to accept various inserts or support fixtures (Fig. 3) to provide for the support of irregularly configured specimens. When inserts are used to support test specimens, care must he taken to align the indcntor to the center of thc insert, or the point at which the indentor is to contact the specimen. Care should be exercised to assure that the indentor does not abruptly contact the specimen support table as damage to the indentor may result.
6. Test Specimen
6.1 The test specimen, herein referred to as “specimen” or “test specimen” interchangeably, shall he at least 6.0 mm (0.24 in.) in thickness unless it is known that results equivalent to the 6.0-mm (0.24-in.) values arc obtained with a thinner specimen.
6.1.1 A spccimcn may he composed of plied pieces to obtain the necessary thickness, but determinations made on such specimens may not agree with those made Ofl solid specimens. as the surfaces of the plied spec imens may not be in complete contact. The lateral dimensions of the specimen shall he sufficient to permit measurements at least 12.0 mm (0.48 in.) from any edge, unless it is known that identical results are obtained when measurements are made at a lesser distance from an edge.