ISO 2419:2012 pdf download.Leather – Physical and mechanical tests – Sample preparation and conditioning.
ISO 2419 specifies the preparation of leather for physical and mechanical testing together with standard atmospheres for conditioning and testing. It is applicable to all types of dry leather.
2 Terms and definitions
For the purposes of ISO 2419, the following terms and definitions apply.
2.1
atmosphere
ambient conditions defined by the parameters temperature and relative humidity
2.2
standard atmosphere
atmosphere maintained within prescribed tolerances, in which a sample is kept for a given period of time before being subjected to testing
The alternative tropical standard atmosphere shall have a temperature of 27,0 °C and a relative humidity of
65,0 %.
3.3 Tolerance zone for standard atmospheres
The tolerance for temperature is ± 2,0 °C. The tolerance for relative humidity is ± 5,0 %.
4 Design of press knives
The design of press knives is shown in Figure 1. The internal surfaces shall be perpendicular to the plane which contains the cutting edge. The angle formed between the internal and external surfaces of the press knife at the cutting edge shall be approximately 20°, and the wedge of this angle shall be of a depth (d) exceeding the thickness of the leather.
NOTE Hardened, knife-grade steel is suitable for press knives.
5 Preparation of test pieces
Prepare test pieces by applying the press knife to the grain surface (or simulated grain surface) if present. If no grain or simulated grain is present, apply the press knife to either surface. If preferred, leather may be conditioned (see Clause 6) before test pieces are prepared.
6 Conditioning
Condition the sample by keeping it in one of the standard atmospheres specified in Clause 3. Support the sample to allow free access of air to all surfaces, keeping the air in motion around it (see 2.3). Condition the test pieces for a minimum of 24 h prior to testing.
The 24 h conditioning is for dry leathers. Leathers with high moisture contents should be dried prior to conditioning.
7 Testing
Carry out the testing in the same standard atmosphere as that in which the test piece was conditioned unless otherwise specified in the individual test method.
8 Test report
The test report shall include the following:
a) reference to ISO 2419, i.e. ISO 2419;
b) the details of the alternative atmosphere, if used, for conditioning and testing;
c) details of any deviations from ISO 2419.ISO-2419-2012