ASTM D3265:2019 pdf download.Standard Test Method for Carbon Black-Tint Strength.
9.1.1.6 Set the muller for 25 revolutions with one extra mass on the arm equivalent to a force of 445 N (1 (M) lbfl on the plate. Close the plates, raise the mass arm, and start the muller.
9.1.1.7 At the end of the 25-revolution cycle, lower the mass arm, and open the plates. Scrape the upper plate with a spatula to remove as much paste as possible, and transfer it to the center of the lower plate. Then, with the lower plate rotating, use the spatula to spread the paste to a flattened circle on the plate, then work all of the paste to the exact center. Repeat this step two additional times. Clean the material from the spatula onto the top mulling plate.
9.1.1.8 Repeat 9.1.1.6 and 9.1.1.7 three times, for a total of four cycles of 25 revolutions each.
9.1.1.9 Remove the paste to a smooth, clean surface, and clean the muller plates, using a solvent and wiping tissue. (Warning— Denatured alcohol is highly flammable. Use only small quantities for cleaning. Make sure that the working environment is sufficiently vented. Do not start the muller immediately after cleaning, since ethanol/air vapors might be ignited.)
9.1.1.10 Prepare the paste for reflectance measurement by one of the methods in 9.2.1 or 9.2.2 and measure the paste reflectance by one of the methods in 9.3.1 or 9.3.2.
9.1.2.1 Mill pelleted carbon black using IKA milling procedure in 9.1.2.2 —9.1.2.10. If testing powder samples proceed to 9.1.2.11.
9.1.2.2 Clean Analytical Mill using tissue and vacuum until visually clean. Pieces of tissue may be added to mill and ground to aid cleaning the chamber and blades.
9.1.2.3 Add 4 to 5 g pelleted CB to mill.
9.1.2.4 Add chamber reduction insert and close lid.
9.1.2.5 Grind for 15 s and discard sample.
9.1.2.6 Repeat the steps in 9.1.2.2 and 9.1.2.4.
9.1.2.7 Grind using two (2) 15 s pulses.
9.1.2.8 Remove lid and insert. Use a spatula to loosen CB from mill wall and blades.
9.1.2.9 Repeat the steps in 9.1.2.4, 9.1.2.7, and 9.1.2.8.
9.1.2.10 Discharge sample from mill. (Sample should be dried in oven.)
9.1.2.11 Set SpeedMixer acceleration “ramp tip” = 10 s.
9.1.2.12 Tare a 15 g cup on analytical balance.
9.1.2.13 Weigh 4.5000 g zinc oxide directly into the 15 g cup.
9.1.2.14 Weigh exactly 0.1200 g CB directly into the 15 g cup on top of zinc oxide (0.2400 g for N500, N600, N700 series). Minimize CB contact with the cup wall by making a depression in the zinc oxide for the CB to be placed.
9.1.2.15 Close cup lid and place into holder without disturbing the zinc oxide and CB.
9.1.2.16 Place holder correctly in machine basket and dry grind for 3 mm at 2500 r/min—rnake sure the cup is kept upright to keep CB from getting on lid.
9. 1 .2. 1 7 Remove holder from instrument, remove cup from holder, and carefully remove lid.
9.1.2.18 Add eight (8) 5 mm glass beads.
9.1.2.19 Add 2.64 g Paraplex.
ASTM D3265:19 pdf download
