CFR›Title 7›Subtitle B›Chapter I›Part 28›Subpart A›Subject Group Requests for Classification and Comparison ContainsSections 28.15–28.19CorpusDaily eCFRDisplayed edition2026-05-07Last updated2026-05-07 Sections 28.15 § 28.15 Classification and comparison; requests. 28.16 § 28.16 Request for return of samples. 28.17 § 28.17 Filing of requests for classification or comparison. 28.18 § 28.18 One request only for classification. 28.19 § 28.19 Withdrawal or rejection of classification request. Previous Publications Media Publications Media Next Reviews Reviews