5. Additional symbols: special features
"Up to four symbols may be added to the base polymer symbols to differentiate, if necessary, modifications of a base polymer. These additional symbols should be placed after the base polymer symbol, separated from this symbol by a hyphen. None of the symbols should be placed in front of the base polymer symbol" (NF EN ISO 1043-1).
These symbols and their meanings are shown in the table 4 .
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Additional symbols: special features
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