PDF《Ti-Pure?》

4 VII. Special Safety Considerations (Cont.) B. Procedure Hazards 1. The Hockmeyer mill must be locked out any time the glass discs are being handled or cleaned. 2. Leather gloves must be worn when handling the glass discs. 3. Use caution with glass discs. 4. Spray booth exhaust fan must be on while spraying. 5. The oven is 300°F ± 10°F. Use heat resistant gloves when handling hot rack and samples. 6. The chemicals, acetone, Beckosol 12-035, Cymel 248-8, Hi-sol 10, n-butanol and Xylol are all combustible or flammable;

avoid ignition sources. 7. Follow local safety regulation pertaining to handling of flammable solvents, use of moving machinery, and ovens. VIII. Procedure A. Operating Conditions Refer to the operating manuals for all equipment used in this test. B. Calibration Calibrate the glossmeter according to operating manual or site Standard Job Procedures. C. Sample Analysis 1. Disperser set up. a. Check the manufacturer'

s operating manual before starting the equipment. b. Lock out the disperser.

5 c. Install sand grinding discs on the Hockmeyer shaft and tighten carefully. The discs are glass;

use care in handling. Do not use any discs which show excessive wear Or are cracked or chipped. A fiber washer must be placed on each side of the disc to avoid glass-to-metal contact. The glass discs should be positioned on the shaft so the bottom surface of the bottom disc is ~1/2 inch above the end of the shaft. The opening between the discs should be ~2 inches. d. Position the water-cooled pot containing an empty

1000 mL Tri-Pour beaker in the Pot Holder Assembly or Vise;

do not tighten pot holder assembly. e. Lower sand-grinding disc assembly into the beaker and center the beaker so that the distance between the discs and the beaker wall is uniform on all sides. The Hockmeyer support column shaft should have a stop installed so that at the limit of the downward travel the bottom of the shaft is ~1/2 inch from the bottom of the beaker. f. Tighten the pot holding assembly. Once this is set up, there is normally no need to move during a grind series. g. Raise sand-grinding disc assembly and remove plastic beaker. Hockmeyer is now ready for use as a sand grinder. 2. Preparation of Grind Vehicle a. Grind Vehicle should be made up ahead of time, shook for 10-15 minutes on a paint shaker and allowed to stand before use until all air bubbles are gone. b. Grind Vehicle Formula

1 Grind

1 Gallon (15 grinds) Beckosol 12-035(R) 149.6 ± 1.0 g 2,244 ± 10.0 g Xylol 79.0 ± 0.5 g 1,185 ± 10.0 g n-butanol _ 9.4 ± 0.1g

141 ± 1.0 g 238.0 ± 1.0 g 3,570 ± 10.0 g 3. Preparation of Reduction Vehicle a. The Reduction Vehicle should be made up ahead of time, shook 10-15 minutes on the paint shaker and allowed to stand before use until all air bubbles are gone.

6 D. Sample Analysis (Cont.) b. Reduction Vehicle Formula

1 Gri........