Home>ISO Standards>ISO 20557-1:2018 pdf free

ISO 20557-1:2018 pdf free

ISO 20557-1:2018 pdf free.Plastics一Poly(phenylene ether) (PPE) moulding and extrusion materials
This document is applicable to all PPE materials, including those modified with polystyrene or polyamide or other materials.
It applies to materials ready for normal use in the form of powder, granules or pellets and to materials unmodified or modified by colorants, additives, fillers, etc.
It is not intended to imply that materials having the same designation give necessarily the same performance. This document does not provide engineering data, performance data or data on processing conditions which can be required to specify a material for a particular application and/or method of processing. If such additional properties are required, they are intended to be determined in accordance with the test methods specified in ISO 20557-2, if suitable.
In order to specify a thermoplastic material for a particular application or to ensure reproducible processing, the requirements are given in data block 5 (see 4.1).
In this data block, the type of fller and/or reinforcing material is represented by a single code-letter in position 1 and its physical form by a second code-letter in position 2, the code-letters being as specified in Table 2. Subsequently (without a space), the mass content may be given by a two-figure number in positions 3 and 4.
In this data block, information about intended application and/or method of processing is given in position 1 and information about important properties, additives and colour in positions 2 to 8. The code-letters used are specified in Table 3.
In this data block, the temperature of deflection under load is represented by the letter A or B followed by a three-figure code-number (see 4.5.2), the melt volume-flow rate by a two-figure code-number (see 4.5.3), the impact strength by a two-figure code-number (see 4.5.4) and the flammability by a combination of code-letters and code-numbers indicating the flammability category (see 4.5.5). The code-numbers are separated from each other by hyphens.
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.ISO 20557-1 pdf free.


Related standards