ASTM D4426-01(R2021) pdf free download

ASTM D4426-01(R2021) pdf free download.Standard Test Method for Determination of Percent Nonvolatile Content of Liquid Phenolic Resins Used for Wood Laminating
1. Scope
1.1 This test method covers the recommended procedure for the determination of the nonvolatile or total solids content of liquid phenolic resins used for wood laminating. 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.
5. Significance and Use
5.1 This test method is intended as a fast and economical determination of the nonvolatile content of liquid phenolic resins used for wood laminating and is useful for general comparative purposes. For greater precision and accuracy, Test Method D1582 is recommended.
6. Apparatus
6.1 Disposable Aluminum Foil Dishes, 60-mm (2.4-in.) diameter by 16-mm (0.60-in.) depth. N OTE 1—A glass dish may be used if the pH of the resin is greater than ten. 6.2 Desiccator, charged with Drierite or equivalent desic- cant. 6.3 Mechanical Convection Oven. 6.4 Analytical Balance, accurate to 60.1 mg (0.000002 lb). 6.5 Eye Droppers, or Dropping Pipettes, 2-mL capacity. 6.6 Anemometer. 6.7 Stainless Steel Trays, fabricated 30 gauge, 83 by 250 mm (3.25 by 9.8 in.), with 19-mm (0.75-in.) sides and open ends. 6.8 Modified Oven Shelves, fitted with fabricated 18-gauge 19 by 19-mm (0.75 by 0.75-in.) stainless steel angle stop positioned 108 mm (4.25 in.) from back edge. Shelf-stop ensures consistent solids dish placement and prevents place- ment at the rear of the oven where airflow is erratic. 6.9 Laboratory Hotplate, with heating capacity to 270°C (518°F).
10. Procedure
10.1 Adjust oven to 125 6 1°C (257 6 2°F). 10.2 Weigh a clean, previously numbered and heat-treated, aluminum dish to the nearest 0.1 mg (0.000002 lb) on an analytical balance. 10.3 Using an eyedropper or dropping pipette, add approxi- mately 1 g (0.002 lb) of resin to the center of the dish. (Allow resin to remain as a “button.”) 10.4 Reweigh the dish and resin to the nearest 0.1 mg (0.000002 lb). Weigh rapidly to minimize loss by evaporation. 10.5 Repeat 10.2 – 10.4 twice more for a total of three specimens per resin sample. 10.6 Place dishes on a stainless steel tray and set the tray in the oven. Trays are positioned with tray side against shelf-step and parallel with airflow. Use only the top three shelfpositions, with no more than two trays of specimens per shelf. 10.7 Dry the specimens at 125 6 1°C (257 6 2°F) for 105 6 3 min. 10.8 Remove the dishes with the dried specimens and place in a desiccator to cool for at least 5, but not more than 15 min. 10.9 When cool, weigh each specimen as rapidly as possible to the nearest 0.1 mg (0.000002 lb). Inspect each specimen visually at the time of weighing. If any of the three specimens obviously deviates from the other two, or from usual normal appearance, discard all three specimens and rerun the test.
13. Precision and Bias
13.1 Precision—The precision of this test method varies with resin type, solids content and caustic level. Four resins of varying type, solids level and caustic level were evaluated in a series of round-robin tests to determine repeatability and reproducibility ofthis test method. The data generated by these round-robin tests will be available at a later date. 13.1.1 Repeatability—The average repeatability standard deviation has been determined to be 0.12 % (0.08–0.15), with an average repeatability at 95 % of 0.34 % (0.21–.43) for four different resins. 13.1.2 Reproducibility—The average reproducibility stan- dard deviation has been determined to be 0.20 % (0.10–0.30), with an average reproducibility at 95 % of 0.56 % (0.28–0.83) for four different resin samples. 13.2 Bias—No information can be presented on the bias of the procedure in Test Method D4426 for measuring phenolic resin nonvolatile content because no material having an ac- cepted reference value is available.