{"id":4881,"date":"2026-08-13T09:13:06","date_gmt":"2026-08-13T07:13:06","guid":{"rendered":"https:\/\/catalaix.com\/near-infrared-spectroscopy-nir\/"},"modified":"2026-08-13T09:14:39","modified_gmt":"2026-08-13T07:14:39","slug":"near-infrared-spectroscopy-nir","status":"publish","type":"post","link":"https:\/\/catalaix.com\/en\/near-infrared-spectroscopy-nir\/","title":{"rendered":"Near-infrared spectroscopy (NIR)"},"content":{"rendered":"\n

Near-infrared spectroscopy (NIR) is an established method for the rapid and non-destructive identification of various types of polymers.<\/p>\n\n

In this process, the material is irradiated with near-infrared light. Characteristic molecular bonds\u2014specifically C\u2013H, O\u2013H, and N\u2013H groups\u2014absorb specific wavelengths of the radiation, producing a material-specific absorption spectrum. Since every polymer has a unique chemical structure, a characteristic spectrum is generated that serves as a chemical fingerprint for unambiguous material identification. <\/p>\n\n

This rapid and precise analysis is a crucial prerequisite for efficient sorting and high-quality plastic recycling. A well-known limitation of NIR spectroscopy concerns black plastics. If they contain carbon black as a pigment, near-infrared radiation is almost completely absorbed. Consequently, no analyzable reflection signal is generated, meaning that these materials can be identified only to a limited extent\u2014or not at all\u2014using NIR spectroscopy. <\/p>\n\n

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Unblock content<\/a> Accept required service and unblock content<\/a> <\/div> <\/div> <\/div><\/div>\n<\/div><\/figure>\n","protected":false},"excerpt":{"rendered":"

Near-infrared spectroscopy (NIR) is an established method for the rapid and non-destructive identification of various types of polymers. In this process, the material is irradiated with near-infrared light. Characteristic molecular bonds\u2014specifically C\u2013H, O\u2013H, and N\u2013H groups\u2014absorb specific wavelengths of the radiation, producing a material-specific absorption spectrum. Since every polymer has a unique chemical structure, a […]<\/p>\n","protected":false},"author":5,"featured_media":4872,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-4881","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/catalaix.com\/en\/wp-json\/wp\/v2\/posts\/4881","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/catalaix.com\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/catalaix.com\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/catalaix.com\/en\/wp-json\/wp\/v2\/users\/5"}],"replies":[{"embeddable":true,"href":"https:\/\/catalaix.com\/en\/wp-json\/wp\/v2\/comments?post=4881"}],"version-history":[{"count":1,"href":"https:\/\/catalaix.com\/en\/wp-json\/wp\/v2\/posts\/4881\/revisions"}],"predecessor-version":[{"id":4882,"href":"https:\/\/catalaix.com\/en\/wp-json\/wp\/v2\/posts\/4881\/revisions\/4882"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/catalaix.com\/en\/wp-json\/wp\/v2\/media\/4872"}],"wp:attachment":[{"href":"https:\/\/catalaix.com\/en\/wp-json\/wp\/v2\/media?parent=4881"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/catalaix.com\/en\/wp-json\/wp\/v2\/categories?post=4881"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/catalaix.com\/en\/wp-json\/wp\/v2\/tags?post=4881"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}