The sample may be tested as received, unmassed, or it may be massed. Better repeatability within labs and reproducibility between labs is normally obtained on unmassed samples. However, the sample may be massed to expel air, to consolidate particles, or to modify it, if necessary (for example,friable rubber or rubber crumb samples may have air expelledand the rubber compacted by pressing in a press or by use ofa cold mill at low temperatures). When mill massing isperformed, use the sample preparation steps shown in 7.2 andas specified in Table 1 for the type of rubber being tested.When specimens cannot be easily cut from the unmassedmaterial and mill massing is not appropriate, the manufacturerof the material should be asked to recommend an alternatesample preparation procedure. For best reproducibility ofresults, minimum work (shear) should be done to the materialduring sample preparation.
The sample may be tested as received, unmassed, or it<br>may be massed. Better repeatability within labs and reproducibility between labs is normally obtained on unmassed<br>samples. However, the sample may be massed to expel air, to<br>consolidate particles, or to modify it, if necessary (for example,<br>friable rubber or rubber crumb samples may have air expelled<br>and the rubber compacted by pressing in a press or by use of<br>a cold mill at low temperatures). When mill massing isperformed, use the sample preparation steps shown in 7.2 and<br>as specified in Table 1 for the type of rubber being tested.<br>When specimens cannot be easily cut from the unmassed<br>material and mill massing is not appropriate, the manufacturer<br>of the material should be asked to recommend an alternate<br>sample preparation procedure. For best reproducibility of<br>results, minimum work (shear) should be done to the material<br>during sample preparation.
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