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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Also avoid sections that are very thin as some of the clumps of carbon black may be brushed out. However, before astmm either of these latter methods, the stock should be pressed out to eliminate most of the air holes. Number of Tests 8. Next, reimmerse the specimen mount in liquid nitrogen for the required amount of time.
Standard – Standard Test Methods for Carbon Black-Dispersion in Rubber ASTM D –
Other alternative approaches for curing high unsaturation polymers without actually mixing in curatives are 1 high-energy radiation and 2 chemical treatment with sulfur monochloride. Tear it so that a aztm surface is exposed. The most nearly smooth and?
Precision and Bias This test method is applicable to rubber compounds containing all types of carbon blacks over a wide range of e2663. They may contain substantial amounts of polymer or extender oil. The percentage ranges and agglomerate size categories are listed in Table 1 and Table 2.
ASTM D – 14 Standard Test Methods for Carbon Black—Dispersion in Rubber
Preparation of Glass Knives Record the values for these two points. The section will be curled up in a small tight roll.
Then proceed as in 7. Then, the volume percentage of black can be calculated from the following simpli? The correlations of these properties with the dispersion index determined by the microroughness measure8 ment method exhibit the same pattern described for the agglomerate count method in Section Such samples are quite tedious to measure. Thickness should be preferably about 6 mm.
In instances of high agglomerate frequency, the surface of stocks of this type may show a general roughness or? This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?
These instances would include in particular the evaluation satm compounds at very low dispersion levels which are known to be of poor quality by simple visual inspection of the sections. Then cure and proceed as above.
ASTM D e1. The chart is graduated from A to H in the direction of lower percent dispersion and from 1 to 6 in the direction of increasing agglomerate size. BR compounds may require 2-min or longer freezing time.
Careful manipulation of the solvent wet brush will unroll and spread the section out? Count all squares that are at least half covered by an agglomerate of carbon black.
Standard Test Methods for Carbon Black—Dispersion in Rubber
In cases of dissimilarity in the size and frequency of the agglomerates in the specimen and those of the standards, the operator shall assign the rating that in his judgment is most applicable. Normally, the visual dispersion ratings indicate the following levels of compound quality: With a brush dipped in FIG. A sheet of plate glass on the surface of the vibration isolator is suitable for this purpose.
The correlation of these properties with the percentage dispersion determined by the Agglomerate Count Method approximates the following pattern for many types of black loaded rubber compounds: The values for A are always positive, and those for B are negative because the intercept is a fraction. Since this test method involves direct measurement, it is quantitative and more accurate than the visual test method. This adjustment must be coordinated with a correction in the opposite direction for the overall height of the stylus probe.
Originally published as D — 67 T. A large sheet of glass should? Unvulcanized specimens should be recooled to? U 5 total number of graticule squares that are at least half?