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ASTM D269-97(R2020) pdf free download

ASTM D269-97(R2020) pdf free download.Standard Test Method for Insoluble Matter in Rosin and Rosin Derivatives
1. Scope
1.1 This test method covers the determination ofthe amount of insoluble matter in rosin and rosin derivatives as described in Terminology D804. 1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only. 1.3 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 ofregulatory limitations prior to use. 1.4 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.
3. Significance and Use
3.1 Rosin, particularly gum and wood rosin, occasionally contains small amounts of contamination such as sand, dirt or bark. Rosin derivatives occasionally contain traces ofinsoluble material as a result ofthe raw materials used in their production or they may be generated during the production process. In all instances the presence of such insoluble material should be minimal. This test method describes a rapid and reliable procedure for determining the amount ofsuch insoluble matter. It is based on the knowledge that rosin and most of its derivatives are soluble in numerous organic solvents whereas most common contaminants are not. It is especially useful for internal quality control rather than sales specifications.
4. Apparatus
4.1 Beaker, 800 mL. 4.2 Magnetic Stirring Hot Plate with Polytetrafluoroethyl- ene (PTFE) Stirbar, or hot plate with manual stirring rod. 4.3 Precut Stainless Steel Circular Screen, 325 mesh with 0.0014-in. wire diameter. (44-µm openings) as described in Specification E11. 4.4 Two-Piece Filter Apparatus, appropriate to hold the stainless steel screens without leaking. 4.5 Analytical Balance, capable of weighing 0.0001 g. 4.6 Laboratory Tweezers. 4.7 Forced Draft Oven.
5. Reagents
5.1 Clean Toluene, Hexane, Mineral Spirits, or other suit- able solvent for the specific material to be checked in, as agreed upon between the customer and the supplier. 6. Procedure 6.1 Rinse the pre-cut screen thoroughly with the solvent to clean it before use. 6.1.1 Dry the clean screen at 105 to 110°C for 30 min, cool in a desiccator, and weigh. 6.1.2 Record the weight of the dry screen to the nearest 0.0001 g. 6.1.3 Place the screen in the filter apparatus and secure it to prevent leakage. N OTE 1—Always use tweezers when handling the pre-cut screen. 6.2 Weigh 100 6 0.1 g of freshly powdered material to be tested into an 800-mL beaker. Add 150 mL of solvent. Place a PTFE-coated magnetic stir bar into the beaker, and place the beaker on a hot plate. Heat and stir the material until it is completely dissolved. Do not boil the solvent.6.3 Immediately pour the solution through the screen. Rinse the beaker and filter apparatus three times with additional hot solvent. 6.4 Disassemble the filter apparatus, remove the screen, and place it in a forced draft oven, contaminated side up. Dry the screen to constant weight at 105 to 110°C (1 h is usually sufficient), cool in a desiccator, and weigh. Record the weight of the dry contaminated screen to the nearest 0.0001 g.
7. Calculation
8. Report
8.1 Report the percent insoluble matter to the nearest 0.01 %.
9. Precision and Bias
9.1 It is not practical to measure the precision and bias of the procedure in this test method because this test method is primarily used for internal quality control purposes rather than for customer specification purposes.

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