ISO 289-3:1999 pdf free download.Rubber, unvulcanized — Determinations using a shearing-disc viscometer — Part 3: Determination of the Delta Mooney value for non-pigmented, oil-extended, emulsion-polymerized SBR.
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 piovisions 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 2891 :1994. Rubber, unvulcanized — Determinations using a shea ring d,sc viscometer — Part 1:
Determination of Mooney viscosity.
ISO 1795 :_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
Al value
the difference between the Mooney viscosities of an unmassed test sample recorded at 15 mm and 1 mm, i.e. ML(1+15)—ML(1+1)
A2 value
the difference between the Mooney viscosities of an unmassed test sample recorded at 7 mm and 1 mm, i.e. ML(1+7)— ML(1+1)
A3 value
the difference between the Mooney viscosities of a massed test sample recorded at 15 mm and 1,5 mm,
i.e. ML(1+15) — ML(1+1,5)
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 arid 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 mm at 23 °C ± 2 °C, followed by a relaxation period of 15 mm.
Prepare the massed test sample as described in ISO 1795.
9 Calculation and expression of results
Determine the Delta Mooney Al value as the difference between the Mooney viscosities recorded at running times of 15 mm and 1 mm.
Determine the Delta Mooney A2 value as the difference between the Mooney viscosities recorded at running times of 7 mm and 1 mm.
Determine the Delta Mooney A3 value as the difference between the Mooney viscosities recorded at running times of 15 mm and 1,5 mm.
Determine the Delta Mooney B value as the difference between the minimum and maximum Mooney viscosities (see Figure 1).
NOTE For Delta Mooney A. lower (in most cases more negative) values are indicative of easier-processing rubbers. For Delta Mooney B. lower values also indicate easier processing.
10 Test report
The test report shall include the following information:
a) all details necessary for complete identification of the rubber tested, including whether the test sample was compacted or not;
b) a reference to this part of ISO 289. i.e. ISO 289-3;
c) the model of viscometer used and the name of the manufacturer;
d) the Delta Mooney Al, A2, A3 and/or B value;
e) details of any operation not included in this part of ISO 289, as well as any operation regarded as optional;
f) the date of the test.