ISO 289-3:1999 pdf download – Rubber, unvulcanized – Determinations using a shearing-disc viscometer

03-01-2022 comment

ISO 289-3:1999 pdf download – Rubber, unvulcanized – Determinations using a shearing-disc viscometer
1 Scope
This part of ISO 289 specifies a method for determining the Delta Mooney value of non-pigmented, oil-extended emulsion-polymerized styrene-butadiene rubber.
2 Normative references
The following normative documents contain provisions which, through reference in this text, constitute provisions of this part of ISO 289. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this part of ISO 289 are encouraged to investigate the possibility of applying the most recent editions of the normative documents listed below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards.
ISO 289-1 :1 994, Rubber, unvulcanized — Determinations using a shearing-disc viscometer — Part 1 :Determination of Mooney viscosity.
ISO 1 795 :— 1 ) , Rubber, raw, natural and synthetic — Sampling and further preparative procedures.
3 Terms and definitions
For the purposes of this part of ISO 293, the following terms and definitions apply:
3.1 Delta Mooney A values
3.2 Delta Mooney B value
the difference between the minimum Mooney viscosity soon after starting the rotor and the subsequent maximum Mooney viscosity for an unmassed test sample (see Figure 1 )
NOTE The values are complementary, and any combination may be used to assist in distinguishing those rubbers that are easy to process from those that process with significantly greater difficulty.
4 Principle
The test consists of determining the difference between the Mooney viscosity values at two specified times (Delta Mooney A) or at two specified points on the curve of Mooney viscosity against time (Delta Mooney B).
5 Apparatus
Use the apparatus specified in, and calibrated in accordance with, ISO 289-1 .
6 Preparation of test specimen
Ensure that the unmassed test sample is free from entrapped air and that the surface is smooth and regular,thereby avoiding air entrapment between the test specimen and the rotor or die surfaces. This may be achieved by compacting the test sample in a mould for 5 min at 23 °C ± 2 °C, followed by a relaxation period of 1 5 min. Prepare the massed test sample as described in ISO 1 795. Prepare the test specimen from the test sample as described in ISO 289-1 .
7 Test temperature
The test temperature shall be 1 00 °C ± 0,5 °C, this being the temperature of the closed dies with the rotor in place and the cavity empty.
8 Procedure
Conduct the test following the procedure described in ISO 289-1 , using the large rotor, a preheating time of 1 min and a running time of either 7 min or 1 5 min.
If the viscosity has not been recorded continuously, plot the observed Mooney viscosity values as specified in ISO 289-1 .
NOTE An automatic recorder is strongly recommended.

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