ASTM D5040-90(R2021) pdf free download

ASTM D5040-90(R2021) pdf free download.Standard Test Methods for Ash Content of Adhesives
1. Scope
1.1 These test methods cover procedures used in determin- ing the ash content of adhesives. This standard is intended as a replacement for Method 4032.1 of Federal Test Method Stan- dard 175B, “Adhesives: Methods of Testing.” 1.2 Two test methods are used: 1.2.1 Test Method A is used for a starch adhesive or other type glue, where there is no danger from the non-volatile content forming a rubbery mass when ignited. 1.2.2 Test Method B employs nitric acid to avoid the non-volatile residue being transformed into a viscous foam when ignited. 1.3 These methods are not applicable to adhesives contain- ing decomposable salts such as zinc chloride. 1.4 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.5 This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appro- priate safety, health, and environmental practices and deter- mine the applicability of regulatory limitations prior to use. For a specific hazard statement, see 9.2.3. 1.6 This international standard was developed in accor- dance with internationally recognized principles on standard- ization established in the Decision on Principles for the Development of International Standards, Guides and Recom- mendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
4. Summary of Test Methods
4.1 Ash content of adhesive materials is determined by heating a sample of material to remove all of the volatile components. Complete oxidation and removal of all carbona- ceous material may be enhanced by the addition of concen- trated HNO 3 . The general method of burning the residual ash in a muffle furnace at 600 6 25°C (1112 6 45°F) for 8 h or until constant weight, is used.
5. Significance and Use
5.1 This test method measures the amount of inorganic material in the sample.
6. Apparatus
6.1 Crucible, porcelain, silica or platinum with a tightly fitting lid, having a capacity of 30 to 45 mL. 6.2 Evaporating Dish, porcelain, silica, or platinum, with a capacity of 150 mL. 6.2.1 Watch Glasses to cover evaporating dishes. 6.3 Desiccator, equipped with drying agent and tray. 6.4 Analytical Balance, sensitive to 1 mg. 6.5 Steam Bath.
9. Procedure
9.1 Test Method A—Place a 5.0 6 0.5-g test specimen in an ignited and tared crucible and evaporate to dryness on a steam bath. Cool in a desiccator and weigh accurately. Heat the crucible and its contents in a muffle furnace, gradually heating the furnace until the temperature reaches 600 6 25°C (1112 6 45°F). With the ignition temperature kept at 600°C (1112°F), allow the specimen to remain in the muffle furnace for 8 h or until constant weight is reached. Check weight by cooling in desiccator and weighing to constant weight. 9.2 Test Method B: 9.2.1 Place 5.0 6 0.5 g test specimen in a tared and ignited dish and evaporate to dryness on a steam bath. N OTE 1—It is necessary to evaporate all volatile solvent to avoid fire hazard when subjecting material to subsequent drying operation. 9.2.2 Dry the test specimen in the oven at 100 to 105°C (212 to 221°F) for 5 h, cool in the desiccator, then reweigh to the nearest mg. Add 25 mL nitric acid to the dried material in the evaporating dish, cover with a watch glass to prevent loss by spattering, heat on a steam bath until initial vigorous reaction ceases. Repeat addition of 25 mL nitric acid and heating on the steam bath until no further action occurs. Remove the watch glass and continue heating on the steam bath until all excess nitric acid has been removed. Heat the evaporating dish and contents on an electric hotplate, or under an infrared lamp, or in a cold furnace while raising the temperature slowly to prevent spattering and until all volatile matter is driven off and the contents ofthe dish are charred. Then ignite the evaporating dish and contents in the muffle furnace at 600 6 25°C (1112 6 45°F) to constant weight. N OTE 2—The nitric acid treatment in Test Method B increases oxidation of organic material at relatively low temperatures while burning off only the residual carbon in the muffle furnace.