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Significance and Use
This practice may be used to determine non-protein or non-nitrogen containing organic matter in leather which is not extractable with water or hexane. Examples would be vegetable tannins and acrylic lubricants.
1.1 This practice covers the determination of the combined tannin and nonextractable organic resins and the degree of tannage of all types of vegetable-tanned leather and leather with organic retannages. This practice does not apply to wet blue.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
D2868 Test Method for Nitrogen Content (Kjeldahl) and Hide Substance Content of Leather, Wet Blue and Wet White
D2875 Test Method for Insoluble Ash of Vegetable-Tanned Leather
D2876 Test Method for Water-Soluble Matter of Vegetable-Tanned Leather
D3495 Test Method for Hexane Extraction of Leather
ICS Number Code 59.140.10 (Processes and auxiliary materials)
UNSPSC Code 31221603(Organic tanning extracts of vegetable origin)