Standard: TAPP
Method: T 204
Title: Solvent extractives of wood and pulp
Scope
This method is used to determine the amount of solvent-soluble, non-volatile material in wood and pulp. Dichloromethane is the most frequently used solvent; however, other solvent systems may be employed. Contact us for details.
Soluble materials or extractives in wood consist of those components that are soluble in neutral organic solvents. The dichloromethane-extractable content of wood is a measure of such substances as waxes, fats, resins, photosterols and non-volatile hydrocarbons. The amount is markedly influenced by seasoning or drying of the wood. Since the pulping process usually removes most water-soluble and volatile compounds that are also soluble in organic solvents, the solvent extractable material in pulp may be considered to consist primarily of resin and fatty acids and their esters, waxes, and unsaponifiable substances. No single organic solvent is capable of removing all these substances, and different solvents remove different combinations.
Samples
This test is performed in duplicate. For pulps, submit at least 25 grams of air-dried material for each solvent used. For wood samples, submit at least 5 grams of air-dried sawdust for each solvent used.
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