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ISO 2393:2014 pdf free

ISO 2393:2014 pdf free.Rubber test mixes一Preparation, mixing and vulcanization
The roll clearance shall be determined by means of two lead strips 10 mm±3 mm in width, at least 50 mm long and 0,25 mm to 0,50 mm thicker than the roll clearance to be measured. The lead strips shall be inserted, one at each end of the rolls, approximately 25 mm from the guides, while a piece of compounded rubber with a Mooney viscosity, determined in accordance with ISO 289-1, greater than 50 ML(1+4) at 100。C and measuring approximately 75 mm × 75 mm × 6 mm is passing through the centre portion of the nip. The rolls shall be at the temperature specified for mixing. After passing between the rolls, the thickness of the lead strips shall be measured at three separate positions with a micrometer to an accuracy of ±0,01 mm. The tolerance on roll clearance shall be±10 % or 0,05 mm, whichever is the larger.
The mill rolls shall have provision for circulation of heating or cooling media.
Laboratory internal mixers are available in a variety of sizes ranging from a nominal mixer capacity of 65 cm3 (described previously as a miniature internal mixer) to about 3 000 cm3. Interlaboratory test programmes (ITPs) on two different types of synthetic rubber and on natural rubber have shown that mixer capacity does not have a significant effect on the results, provided that good dispersion of all ingredients is achieved (see Annex C for a discussion of the effects of certain mixer variables).
For interlaboratory comparisons, it is preferable to use the same type of mixer and to align the mixing conditions (nominal mixing capacity, mixer head starting temperature, rotor type, and speed, mixing time) as closely as possible.
All of the mixers used in the interlaboratory test programmes (ITPs) were of the tangential-rotor type, and included Banbury, cam, and other types. No laboratory suggested using an intermeshing-rotor mixer. Therefore, the mixer described as type B in the previous edition of this International Standard has been deleted. However, an intermeshing type may be used when the interested parties agree.
ISO 2393 describes general requirements for laboratory internal mixers ranging in nominal mixer capacity from about 65 cm3 to about 2 000 cm3.
WARNING一Laboratory internal mixers should be equipped with a suitable exhaust system and suitable safety devices to prevent accidents, in accordance with national safety regulations.
The operators should be provided with suitable equipment to protect them against hazardous chemicals, in accordance with national regulations.
NOTE The smaller laboratory internal mixers can only provide enough compound for curemeter testing and limited stress-strain testing.ISO 2393 pdf download.

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