ISO 2303 pdf download

ISO 2303 pdf download

ISO 2303 pdf download Isoprene rubber (IR) — Non-oil-extended, solution-polymerized types — Evaluation procedures
1 Scope
This International Standard specifies, for general-purpose non-oil-extended, solution-polymerized polyisoprene rubbers (IR):
physical and chemical tests on raw rubbers;
standard materials, a standard test formulation, equipment and processing methods for evaluating the vulcanization characteristics.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 37, Rubber, vulcanized or thermoplastic — Determination of tensile stress-strain properties
ISO 247:2006, Rubber — Determination of ash
ISO 248-1, Rubber, raw — Determination of volatile-matter content — Part 1: Hot-mill method and oven method
ISO 289-1, Rubber, unvulcanized — Determinations using a shearing-disc viscometer — Part 1:Determination of Mooney viscosity
ISO 1795, Rubber, raw natural and raw synthetic — Sampling and further preparative procedures
ISO 2393, Rubber test mixes — Preparation, mixing and vulcanization — Equipment and procedures
ISO 3417, Rubber — Measurement of vulcanization characteristics with the oscillating disc curemeter
ISO 6502, Rubber — Guide to the use of curemeters
ISO 23529, Rubber — General procedures for preparing and conditioning test pieces for physical test methods
3 Sampling and sample preparation
3.1 A laboratory sample of approximately 1,5 kg shall be taken by the method described in ISO 1795.
3.2 Preparation of the test portion shall be in accordance with ISO 1795.
4 Physical and chemical tests on raw rubber
4.1 Mooney viscosity
The Mooney viscosity shall be determined in accordance with ISO 289-1 on a test portion prepared as described in ISO 1795 (without massing).
The result shall be recorded as ML(1 4) at 100 °C.
4.2 Volatile matter
The volatile-matter content shall be determined in accordance with ISO 248-1.
4.3 Ash
The ash content shall be determined in accordance with ISO 247.
5 Preparation of the test mixes for evaluation of isoprene rubbers
5.1 Standard test formulation
The standard test formulation is given in Table 1.
The materials shall be national or international standard reference materials. If no standard reference material is available, the materials to be used shall be agreed by the interested parties.
5.2.1Equipment and procedure
Equipment and procedure for the preparation, mixing and vulcanization shall be in accordance with ISO 2393.5.2.2Mill mixing procedures
Two mill mixing procedures are specified: methods A and B. The mixing time is shorter in method B than inmethod A.
The two methods do not necessarily give identical results. In laboratory cross-checks or in a series ofevaluations, the same procedure shall be used in all cases.
In both methods, the standard laboratory mill batch mass, in grams, shall be based on four times the formulamass. The surface temperature of the rolls shall be maintained at 70 °C±5°C throughout the mixing.
A good rolling bank at the nip of the rolls shall be maintained during mixing. f this is not obtained with the nipsettings specified in and, small adjustments to the mill openings might be necessary.

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