ISO Class F doesn't refer to a single, universally defined standard. The term "ISO Class F" appears in several different ISO standards, each with a distinct meaning. To understand what ISO Class F means, we need to specify the relevant ISO standard.
ISO Class F in Different Contexts:
Here are some examples of how "ISO Class F" is used in different ISO standards:
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Cabling (ISO/IEC 11801:2002): In this context, Category 7/Class F specifies a high-performance cabling system. It supports a frequency range of 1–600 MHz over 100 meters of fully shielded twisted-pair cabling. The cable typically consists of four individually shielded pairs within an overall shield (S/FTP or F/FTP). This is ideal for high-speed data transmission.
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Marine Fuels (ISO 8217:2017 and ISO 16861:2015): Several ISO standards, including ISO 8217:2017 and ISO 16861:2015, define Class F as a category of marine fuels. These standards specify the characteristics and requirements for these fuels, but the exact properties vary depending on the specific standard.
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Battery Cable (ISO 19642-3): In some instances, such as with the EXRAD® XLE 200 cable, ISO Class F might denote a specific performance class for battery cables. This often relates to the cable's temperature rating and other operational characteristics.
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Tolerances (ISO 2768): The ISO 2768 series of standards defines general tolerances for linear and angular dimensions. Class F (fine) represents a tighter tolerance range than other classes like medium (m), coarse (c), and very coarse (v). It specifies permissible deviations for various nominal lengths.
Therefore, the meaning of "ISO Class F" is highly context-dependent. To accurately interpret its meaning, one must always specify the relevant ISO standard.
