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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Rubbers that contain relatively high amounts of inorganic pigments are particularly prone to ast knife chipping and may require a fresh knife for each different specimen.
Standard – Standard Test Methods for Carbon Black-Dispersion in Rubber ASTM D –
The tank should be supplied with a siphon? This setting will remain constant for subsequent specimens which can simply be mounted in place by gently lifting the stylus with a?
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.
The threaded part of the brass screw shall be 15 mm in diameter and shall extend into the center of the TFE-?
ASTM D – 14 Standard Test Methods for Carbon Black—Dispersion in Rubber
More detailed information regarding freezing times is best compiled by individual operators on their own particular specimens. The correlation of these properties with the percentage dispersion determined d663 the Agglomerate Count Method approximates the following pattern for many types of black loaded rubber compounds: Continue brushing gently to remove all wrinkles.
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.
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. Tear it so that a fresh surface is exposed. However, for halogenated hydrocarbons such as CR or nonhydrocarbons such as silicone rubber, the actual density of the polymer should be taken into consideration. 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.
U 5 total number of graticule squares that are at least half? A sheet of plate glass on the surface of the vibration isolator is suitable for this purpose. The percent dispersion values obtained by Test Method B are used to establish the dispersion index scale for different rubber formulations.
Standard Test Methods for Carbon Black-Dispersion in Rubber
However, the results of that ITP have been translated into Practice D precision expression format as much as possible and are given in this section. The longest dimension of the specimen should be parallel to the top edge of the clamp with about 8 to 10 mm of the specimen protruding above the clamp. The most nearly smooth and? Record this value along with the sample area before swelling. This represents an average of the? Normally, the visual dispersion ratings indicate the following s2663 of compound quality: Vulcanized samples must be employed because of the solvent used to uncurl the thin sections.
However, as a safety precaution, it is recommended that the stage be specially reinforced to withstand the high vapor pressure of liquid carbon astmm. It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.
Then assign the most closely matched numerical rating to each compound being rated. The black clumps of carbon are easily distinguished from the background usually brown in tone and from the knife marks, which appear as long streaks. The test is applicable to the analysis of carbon black dispersion in compounds that d26663 other?
BR requires about 10 to min cure. Record the values for these two points. Take care again that the score mark does not go all the way out to the edges of the glass. Care should be taken to avoid ast, Summary of Test Asmt Deposit the sections in a petri dish of xylene or naphtha as they are cut.
Current edition approved Oct. The section will be curled up in a small tight roll. A wash in a liquid detergent is generally advisable.
The values for dispersion index are inversely proportional to Axtm. Then, score the resultant mm square of glass across the diagonal, keeping the mark a bit off center so that the potential knife edge will be formed slightly away from the FIG. Mill and cure in accordance with Practice D The dispersion level of the carbon black is compared against a series of?