BS ISO 20558-1:2018 pdf free.Plastics一Poly(phenylene sulfide) (PPS] moulding and extrusion materials Part 1: Designation system and basis for specifications.
In this data block, the range of melt mass-flow rate or melt viscosity is represented by a composite designation comprising a code-letter/code-number pair indicating the test conditions followed by a sign and a two-figure code-number indicating the range itself (see i52). the whole being placed between parentheses. This designation is followed by a two-figure code-number representing the density (see 4S3) and a two-figure code-number representing the tensile modulus (see 4.5.4). The composite designation representing the melt mass-flow rate or melt viscosity, the code-number representing the density and the code-number representing the tensile modulus are separated from each other by hyphens.
EXAMPLE The ranges of values of the designatory properties of PPS having a melt mass-flow rate, measured under the conditions 315 °C/5,00 kg (A5), of 8 g/10 mm (09), a density of 1 600 kg/rn3 (16) and a tensile modulus of 14000 MPa (14) would be indicated by (A5 + 09)16-14.
If a property value falls on or near a range limit, the manufacturer shall state which range will designate the material. If subsequent individual test values lie on, or on either side of, the limit because of manufacturing tolerances, the designation is not affected.
NOTE Not all combinations of the values of the designatory properties can be possible for currently available polymers.
4.52 Melt mass-flow rate (MFR) or melt viscosity (MV)
The melt mass-flow rate shall be determined by the method specified in ISO 20558-2, using one of the three sets of test conditions specified in column A of Table 3. and the melt viscosity shall be determined by the method specified in iSO 20558-2, using one of the six sets of test conditions specified in columns B and C of Table 3.
For MFR, set of conditions A5 is the normal set of conditions.
Set of conditions A2 shall be used only for materials having an MFR exceeding 25 g/lO mm when measured using set of conditions AS.
Set of conditions Al shall be used only for materials having an MFR exceeding 25 g/l0 mm when measured using set of conditions A2.BS ISO 20558-1 pdf free download.
Tags: Designation system and basis for specifications
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