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<p>[QUOTE="2manybooks, post: 9466521, member: 8267"]Polypropylene itself is considered safe. However, products are not made from the specific resin alone.</p><p><br /></p><p>"Additives are absolutely essential in the development of commercial polymeric materials." (<a href="https://pubs.acs.org/doi/10.1021/acsomega.9b03058" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://pubs.acs.org/doi/10.1021/acsomega.9b03058" rel="nofollow">https://pubs.acs.org/doi/10.1021/acsomega.9b03058</a>)</p><p>"Various low-molecular organic compounds are used for the modification of polypropylene in bulk. The list of effective modifiers includes fatty acids, their salts, unsaturated dicarboxylic acids and their anhydrides, plasticzers, surfactants, organic peroxides and ketones. Most of the relevant data can be found in patent literature." (<a href="https://www.researchgate.net/publication/235350049_Surface_modification_of_polypropylene_by_additives" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.researchgate.net/publication/235350049_Surface_modification_of_polypropylene_by_additives" rel="nofollow">https://www.researchgate.net/publication/235350049_Surface_modification_of_polypropylene_by_additives</a>)</p><p>"Despite how useful these additives are in the functionality of polymer products, their potential to contaminate soil, air, water and food is widely documented in literature." (<a href="https://www.sciencedirect.com/science/article/pii/S030438941730763X" target="_blank" class="externalLink ProxyLink" data-proxy-href="https://www.sciencedirect.com/science/article/pii/S030438941730763X" rel="nofollow">https://www.sciencedirect.com/science/article/pii/S030438941730763X</a>)</p><p><br /></p><p>With regard to polypropylene materials used for archival storage, it would be safest to use those that have been formulated and tested for conservation standards. Other products may include unknown additives that might have detrimental effects.[/QUOTE]</p><p><br /></p>
[QUOTE="2manybooks, post: 9466521, member: 8267"]Polypropylene itself is considered safe. However, products are not made from the specific resin alone. "Additives are absolutely essential in the development of commercial polymeric materials." ([URL]https://pubs.acs.org/doi/10.1021/acsomega.9b03058[/URL]) "Various low-molecular organic compounds are used for the modification of polypropylene in bulk. The list of effective modifiers includes fatty acids, their salts, unsaturated dicarboxylic acids and their anhydrides, plasticzers, surfactants, organic peroxides and ketones. Most of the relevant data can be found in patent literature." ([URL]https://www.researchgate.net/publication/235350049_Surface_modification_of_polypropylene_by_additives[/URL]) "Despite how useful these additives are in the functionality of polymer products, their potential to contaminate soil, air, water and food is widely documented in literature." ([URL]https://www.sciencedirect.com/science/article/pii/S030438941730763X[/URL]) With regard to polypropylene materials used for archival storage, it would be safest to use those that have been formulated and tested for conservation standards. Other products may include unknown additives that might have detrimental effects.[/QUOTE]
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