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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OE-SBR rubbers require about 30 to min cure.

ASTM D – 14 Standard Test Methods for Carbon Black—Dispersion in Rubber

No other axtm of measurement are included in this standard. Uneven strains are encountered in the latter procedure, and irregularities may occur on the side faces on which the knife edge will be formed.

Prepare a fresh surface on the control as often as necessary to ensure cleanliness. Normally, the visual dispersion ratings indicate the following levels of compound quality: An accurate description of this appearance is often meaningful in determining the cause of a poor masterbatch letdown. For maximum accuracy, the black volume percentage can be calculated from the following expression: The values for dispersion index are inversely proportional to F2H.

A typical unmilled latex masterbatch ULM is shown on the chart. Vulcanized samples must be employed because of the solvent used to uncurl the thin sections.

Then, the volume percentage of black can be calculated from the following simpli? Use a cutting die, if available. D enough subsequently to form buttons about 10 mm in diameter and about 2 to 3-mm deep thoroughly with dicumyl peroxide. For each letter rating the amount of undispersed black is the same throughout the six agglomerate size categories.


Standard – Standard Test Methods for Carbon Black-Dispersion in Rubber ASTM D –

Take care again that the score mark does not go all the way out to the edges of the glass. The head of the brass screw shall be 18 mm in diameter and shall extend 3 mm above the TFE-?

The precison parameters should not be used for acceptance or rejection testing of any group of materials without documentation that they are applicable to those materials and the speci?

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

In borderline cases, use fractional ratings, for example, 31? 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 astmm in his judgment is most applicable. Current edition approved Oct. Number of Tests 8.

Standard Test Methods for Carbon Black—Dispersion in Rubber

Then cover the sections with cover glasses, and seal with tape, or a bit of cement at each corner. They may contain substantial amounts of polymer or extender oil.

The same specimen may be recut by readjusting the position of its exposed edge to a distance of about 8 to 10 mm above the top of the holder. However, it will be noted that some of the micrographs are missing from the coarser agglomerate categories of ranges A, B, and Astmm simply because the percentage rating falls out of the range at that size level.


However, the results of that ITP have been translated into Practice D precision expression format as much as possible and are given axtm this section. U 5 total number of graticule squares that are at least half? 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.

ASTM D e1. If convenient, more than one operator should rate the samples. Your comments will receive careful consideration at awtm meeting of the responsible technical committee, which you may attend.

This will minimize subsequent damage to the knife edge while paring down the specimen. Compounds containing appreciable lower or higher black volume loadings can also be classi? Record this value along with the sample area before swelling. Use fractional ratings when necessary.

At this point, with the advance set in increments of 5 to 10? To accomplish this, press the rubber into a slab between thin sheets of plastic in a mold at a pressure of about 1.

However, for halogenated hydrocarbons such as CR or nonhydrocarbons such as silicone rubber, the actual density of the polymer should be taken into consideration. If the section tends to slip on the slide, hold one corner lightly with a mounted needle. However, before using either of these latter methods, the stock should be pressed out to eliminate most of the air holes. The stylus will move outward 2.