Plastics. Polyketone (PK) moulding and extrusion materials - Designation system and basis for specificationsWhat is ISO 21970 1 Designation system PK about? ISO 21970 1 is the first part of the multi series ISO 21970. ISO 21970 1 establishes a system of designation for polyketone (PK) moulding and extrusion materials which may be used as the basis for specifications. Polyketone polymer chains are built up from regularly alternating olefinic units and keto groups. The olefinic units shall be randomly distributed ethylene and propylene. NOTE 1: The

They can convey useful information about a product

Table 1 — Examples of annual mean values of PAH compounds in PM10 at sampling sites with different characteristics (in ng/m3)

sulphur dioxide exposure test

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Section 3 explains how to represent earthquakes and how to combine them with other events

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PT-F expressed the opinion that the development of a standard was not feasible and that they suspected that a standardization document would not produce the expected results

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The standard has been amended and has updated definitions and normative references to the latest edition of the IEC 60811 series

PD ES 59008-4-1 on Data requirements for semiconductor die is useful for: