BS ISO 4097-2020 Rubber, ethylene-propylene-diene (EPDM)一Evaluation procedure.
4 Sampling and sample preparation
4.1 Takealabcwatorysampleo(approximatelyl.Skgbythemethodde.scnbed in ISO 1795.
42 Prepare the test porilon in accordance with ISO 1795.
S Physical and chemical tests on raw rubber
5.1 Mooney viscosity
DtermInc the Mooney viscosity In aixordarice with ISO 289-1. on a test portion prepared as indicated in 42 (without massing).
If ousting is necessary. maintain the mlii roll surface temperature at SO “C i 5 “C (for rubbers with a low Mooney viscosity, a temperature of 35 C * 5 C can be used). Massing. If used, shall be mentioned in the test report
Record the result as ML(1.4) at 125 “C unless another test temperature (100 C or 150 °C) and/or test lime (1.8) mm has been agreed by the interested parties.
5.2 Vobtile matter
Determine the volatile matter content in accordance with ISO 248.1 or ISO 248-a
5.3 Ash
Determine the ash in accordance with either method A, or method B, or method C of ISO 247-1:2018, or method A of ISO 247-2:20 18.
6 Preparation of test mixes for evaluation
6.1 Standard test formulations
The standard test formulations are given in I.abk.L in which:
a) formulation 1 Is applicable to non.oll.cxtendecl EP[)Ms with a nominal ethylene content not higher than 67 % by mass;
b) formulation 2 is applicable to non-oil-extended EPDMs with a nominal ethylene content equal to or higher than 67% by mass;
c) formulation 3 is applicable to non-oil’extended low Mooney viscosity EPDMs,
d) formulation 4 is applicable to oil-extended EPUMs containing 50 or less parts by mass of oil per 100 parts of rubber;
e) formulation 5 is applicable to oil-extended EPOMs containing more than 50 but less than 80 parts by mass of oil per 100 parts of rubber
f) formulation 6 Is applicable to oil-extended F.PL*Is containing BOor more parts by mass of oil per 100 parts of rubber
6.2 Equipment and procedure
Equipment and procedure for the preparation, mixing, and vulcanization shall be in accordance with ISO 2393.
6.3 Mixing procedures
6.3.1 General
Four alternative mixing procedures are specified.
一Method A1: single stage mixing with laboratory internal mixer (LIM) which is the preferred method.
一Method A2: two-stage mixing with LIM.
一Method A3: two-stage mixing using a LIM for initial mixing and mill mixing for final mixing.
Method B: mill mixing.
Mixing of ethylene propylene-diene rubbers in the standard test formulations using a mill is more difficult than for other rubbers and the use of a LIM allows better results. Because of the difficulty of mill mixing EPDM rubbers, it is recommended that method B be used only if a LIM is not available.BS ISO 4097 pdf download.