ISO 48:2010
Rubber, vulcanized or thermoplastic — Determination of hardness (hardness between 10 IRHD and 100 IRHD)
ISO 48:2010 specifies four methods for the determination of the hardness of vulcanized or thermoplastic rubbers on flat surfaces (standard-hardness methods) and four methods for the determination of the apparent hardness of curved surfaces (apparent-hardness methods). The hardness is expressed in international rubber hardness degrees (IRHD). The methods cover the hardness range from 10 IRHD to 100 IRHD.
These methods differ primarily in the diameter of the indenting ball and the magnitude of the indenting force, these being chosen to suit the particular application.
ISO 48:2010 does not specify a method for the determination of hardness by a pocket hardness meter, which is described in ISO 7619‑2.
ISO 48:2010 does not specify the determination of the apparent hardness of rubber-covered rollers, which is specified in ISO 7267 (all parts).
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Scope
Normative references
Terms and definitions
Principle
Apparatus
General
Methods N, H, L and M
Methods CN, CH, CL and CM
Cylindrical surfaces of radius greater than 50 mm
Surfaces with double curvature of large radius greater than
Cylindrical surfaces of radius 4 mm to 50 mm or small test p
Small O-rings and articles of radius of curvature less than
Test pieces
General
Methods N, H, L and M
General
Thickness
Methods N and H
Method L
Method M
Lateral dimensions
Methods N, H and L
Method M
Methods CN, CH, CL and CM
Time interval between vulcanization and testing
Conditioning of test pieces
Temperature of test
Procedure
Number of readings
Expression of results
Precision
Test report
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Scope
Normative references
Terms and definitions
Principle
Apparatus
General
Methods N, H, L and M
Methods CN, CH, CL and CM
Cylindrical surfaces of radius greater than 50 mm
Surfaces with double curvature of large radius greater than
Cylindrical surfaces of radius 4 mm to 50 mm or small test p
Small O-rings and articles of radius of curvature less than
Test pieces
General
Methods N, H, L and M
General
Thickness
Methods N and H
Method L
Method M
Lateral dimensions
Methods N, H and L
Method M
Methods CN, CH, CL and CM
Time interval between vulcanization and testing
Conditioning of test pieces
Temperature of test
Procedure
Number of readings
Expression of results
Precision
Test report