Buy ASTM D TEST METHODS FOR CARBON BLACK – DISPERSION IN RUBBER from SAI Global. However, unvulcanized compounds should be compressed in a mold for 5 minutes at °C to remove the air holes before testing. ASTM D , Method B , is a. ASTM D Standard Test Methods for Carbon Black-Dispersion in Rubber.
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The product of these dimensions is the area after swelling. Originally published as D — 67 T. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
This will encompass all agglomerates down to about 5? IIR vulcanizates containing 50 phr of N carbon black or oil extended SBR stocks with 50 phr of a N black require about a 1-min freeze.
Then proceed as in 7. However, as a safety precaution, it is recommended that the stage be specially reinforced to withstand the high vapor pressure of adtm carbon dioxide. With a brush dipped in FIG. Four test methods are described as follows: To facilitate a simple estimation of the average agglomerate size, FIG. If the embedding is satisfactory, it is advisable to use a razor blade to trim off any excess mucilage from the top and sides of the specimen.
NOTE 2—Most agglomerates are not composed entirely of carbon black. These standards give the following percent dispersion ratings by the Agglomerate Count Method: Astmm Method B—Agglomerate Count.
Then, manually advance the specimen upward so that its top surface almost reaches the level of the knife. The overall range of dispersion levels should be similar to the range of values listed zstm 6. Summary of Test Method If a die is not used, the specimen length and width should be recorded using a measuring magni?
Then cure and proceed as above. Prepare a fresh surface on the control as often as necessary to ensure cleanliness. These instances would include in particular the evaluation of astk at very low dispersion levels which are known to be of poor quality by simple visual inspection of the sections.
A rating of 5 indicates a state of qstm developing near maximum properties, while a rating of 1 would indicate a state of dispersion developing considerably depressed properties.
To induce fracture, grasp the glass with the pliers so d263 the pressure point on the lower jaw is under e2663 score mark near the center of the strip. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Fracture in this manner is preferred over simply breaking off mm sections one at a time. Compounds containing appreciable lower or higher black volume loadings can also be classi? Cure in accordance with Practice D Use fractional ratings when necessary. The longest dimension of the specimen should be cut along the direction in which the rubber slab was sheeted out.
For specimens that are too soft to be microtomed at liquid CO2 temperatures, pour a little liquid nitrogen onto the specimen block while it is in position on the freezing stage. The surface to be examined is formed with a smooth cutting stroke using a sharp, hot knife a standard type knife heater may be employed.
The percentage ranges and agglomerate size categories are listed in Table 1 and Table 2. Differences are best resolved at e2663 higher magni? Dispersion is evaluated by measuring with a light microscope the percentage area covered by black agglomerates in microtomed sections of the compound.
Lower or higher values for C may be used at the discretion of asym operator.
Standard Test Methods for Carbon Black—Dispersion in Rubber
After cure, scrape off the excess peroxide from the sample surface and proceed with sectioning in the standard manner, taking care not to pare down below the cured surface layer. Visual Dispersion Rating 4 3 2 1 to to to to 5 4 3 2 Classi? Repeat the leveling operation and complementing height correction until the indicator bar remains close to the center point between HIGH and LOW across the entire cm trace.
Record the measurements and average the values for the? Number of Tests 8.
ASTM D – 14 Standard Test Methods for Carbon Black—Dispersion in Rubber
If the A and B constants for the DI calculation are unknown, however, they must be derived using a series of standard mixes which have been analyzed by Test Method B. The black clumps of carbon are easily distinguished qstm the background usually brown in tone and from the knife marks, which appear as long streaks.
These pressure points can be formed with small strips of plastic tape if they are not already incorporated into the jaw surfaces of the pliers.