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 .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.
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.
Note 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 desiccant.
6.3 Mechanical convection Oven.
6.4 Analytical Balance, accurate to ±0. 1 mg (0.00000 1b).
6.5 Eve 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 placement at the rear of the oven where airflow is erratic.
6.9 Laboratory Horplate, with heating capacity to 270°C (518°F).
7. Oven Setup and Periodic Check Specifications
7. 1 Specficatioizs:
7.1.1 Intake Port—6.4 mm (0.25 in.) open.
7.1.2 Exhaust Port—6.4 mm (0.25 in.) open.
7. 1 .3 Internal Airflow—9 1 .4 ± 1 m/mm (300 ± 3 ft/mm) at 40°C (1 04°F).
7.1.4 Temperature—125 ± 1°C (257 ± 2°F).
7.2 A 6.4-mm (0.25-in.) metal spacer is a convenient tool for setting port opdnings.
7.3 Measure with Davis-type anemometer placed as close as possible to the geometric center of’ the cavity with the door shut.
7.4 Set the oven temperature at 125°C (257°F) and record the actual temperature for a period of 2 h. The control range shall be ± 1°C (2°F) during the check period.
8. Sampling
8.1 Take a representative sample of the lot of resin being evaluated of a sufficient quantity for the tests. While the tests consume less than 5 g (0.01 Ib) of resin, a sample of at least 250 g (0.55 Ib) is recommended to ensure that it is representative and that rechecks can he made if desired.
8.2 To ensure that surface evaporation of solvent does not affect the accuracy of the results, mix the resin sample thoroughly just prior to the test.
9. Sample Dish Preparation
9.1 Inscribe an identifying number on each dish to he used in the test. (Prepare three specimens from each sample.)
9.2 Place each dish on a hotplate set at 270°C (518°F) for about 15 s to flash off a thin coating of oil. (A whitish smoke will cease to be given off when all the oil has dissipated.)
9.3 Place the heat-treated dishes in a desiccator for at least 5 min.ASTM D4426 pdf download.