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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Take care that the score mark does not actually extend all the way to the side faces or chipping may result. 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. The percent dispersion values obtained by Test Method B are used to establish the dispersion index scale for different rubber formulations.
The life of a knife depends very much on the number of sections that are cut particularly in paring down the sample block and in the nature of the sample itself. This will encompass all agglomerates down to about 5? 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.
Record the measurements and average the values for the? U 5 total number of graticule squares that are at least half? These standards give the following percent dispersion ratings by the Agglomerate Count Method: The threaded part of the brass screw shall be 15 mm in diameter and shall extend 2d663 the center of the TFE-?
ASTM D – 14 Standard Test Methods for Carbon Black—Dispersion in Rubber
Lower or higher values for C may be used at the discretion of the operator. 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.
However, it will be noted that some of the micrographs are missing from the coarser agglomerate categories of ranges A, Asm, and C simply because the percentage rating falls out of the range at that size level. 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.
This constant eliminates high frequency electronic or vibrational noise which may be dependent on the location of the instrument.
Standard Test Methods for Carbon Black-Dispersion in Rubber
The product of these dimensions is the area after swelling. Deposit the sections in a petri dish of xylene or naphtha as they are cut.
Other alternative approaches for curing high unsaturation d263 without actually mixing in curatives are 1 high-energy radiation and 2 chemical treatment with sulfur monochloride. Dispersion is evaluated by measuring with a light microscope the percentage area covered by black agglomerates in microtomed sections of the compound.
The same specimen may be recut by readjusting the aastm of its exposed edge to a distance of about 8 to 10 mm above the top of the holder. The immersion time depends, primarily, on the type of polymer and the type and loading of carbon black.
Current edition approved Oct.
Also, if too much time is taken, the rubber specimen will soften and will have to be refrozen. Test Method B—Agglomerate Count. No other units zstm measurement are included in this standard. These average values represent a single test result.
Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters. Calculation and Interpretation of Results The overall range of dispersion levels should be similar to the range of values listed in 6. Next, f2663 the specimen mount in liquid nitrogen for the required amount of time.
Four test methods are described as follows:. There is no satisfactory test method presently available for determining the precise amount of carbon black in each agglomerate.
The control sample should represent a minimum acceptable dispersion level for the type of compound being rated. The most nearly smooth and? To accomplish this, press the rubber into a slab between thin sheets of plastic in a mold at a pressure of about 1.
F 5 the number of roughness peaks per cm, and H 5 the number average peak height,?
Stay within 1 to 2 mm of each side. OE-SBR rubbers require about 30 to min cure. The stylus will move outward 2. For maximum accuracy, the black volume percentage can be calculated from the following expression: