§176.150 Chelating agents used in the manufacture of paper and paperboard
The substances named in paragraph （a） of this section may be safely used in the manufacture of paper and paperboard, in accordance with the conditions prescribed in paragraphs （b） and （c） of this section:
（a） Chelating agents:
| List of substances | Limitations |
| Ammonium fructoheptonate | |
| Ammonium glucoheptonate | |
| Disodium ethylenediamine tetraacetate | |
| Pentasodium salt of diethylenetriamine pentaacetate | |
| Sodium fructoheptonate | |
| Sodium glucoheptonate | |
| Tetrasodium ethylenediamine tetra-acetate | |
| TrisodiumN-hydroxyethyl ethylenediamine triacetate |
（b） Any one or any combination of the substances named is used or intended for use as chelating agents.
（c） The substances are added in an amount not greater than that required to accomplish the intended technical effect nor greater than any specific limitation, where such is provided.
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