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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Each square will generally produce one suitable cutting edge. 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 Use fractional ratings when necessary.

Then cure and proceed as above. Position the drive unit on the vibration isolator slab prior to this procedure.

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 section will be curled up in a small tight roll.

The tank should be supplied with a siphon? If a die is not used, the specimen length and width should be recorded using a measuring magni?

Take care again that the score mark does not go all the way out to the edges of the glass. 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. These average values represent a single test result.

BR requires about 10 to min cure. For photomicrographs a 43 plane objective and a periplanatic eyepiece are recommended. 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.

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

Because it can be observed side by side with unknown samples under identical conditions, a control compound is more accurate than the photographic standards in discerning small deviations from what is considered the norm for a speci? This will encompass all agglomerates down to about 5?


Mill and cure in accordance with Practice D Historical Version s – view previous versions of standard.

This represents an average of the? Stay within 1 to 2 mm of each side. Normally, the visual dispersion ratings indicate the following levels of compound quality: Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. This use of a control compound is also advisable. Continue until the stylus makes contact with the reference surface.

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.

Steel knives may also be employed, according to the preference of the operator. Originally published as D — 67 T. Number of Tests 8. More detailed information aztm freezing times is best compiled by individual operators on their own particular specimens.

However, for halogenated hydrocarbons such as CR or nonhydrocarbons such as silicone rubber, the actual density of the polymer should be taken into consideration.

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

Record the values for these two points. Repeat the operation until twelve or more sections have been cut, to ensure good quality. Rubbers that contain relatively high amounts of inorganic pigments are particularly prone to cause knife chipping and may require a fresh knife for each different specimen. Work Item s – proposed revisions of this standard. Last previous edition D — Other alternative approaches for curing high unsaturation polymers without actually mixing in curatives are 1 asm radiation and 2 chemical treatment with sulfur monochloride.

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 asfm in his judgment is most applicable. Summary of Test Method For each letter rating the amount of undispersed black is the same throughout the six agglomerate size categories.


F 5 the number of roughness peaks per cm, and H 5 the number average peak height,? The front edges of the plier jaws should be perpendicular to the score line. Then cover the sections with cover glasses, and seal with tape, or a bit of cement at each corner. NOTE 1—Glass knives should be stored in a desiccator of absolute ethyl alcohol chemically pure qstm conserve the life of the knive edges.

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

The black clumps of carbon are easily distinguished from the background usually brown in tone and from the knife marks, d2636 appear as long streaks. This will minimize dd2663 damage to the knife edge while paring down the specimen. BR compounds may require 2-min or longer freezing asm.

Preparation of Glass Knives Visual Dispersion Rating 4 3 2 1 to to to to 5 4 3 2 Classi? Your comments are invited either for revision of this standard or for additional standards and should be addressed to ASTM Headquarters.

Standard Test Methods for Carbon Black-Dispersion in Rubber

A typical unmilled latex masterbatch ULM is shown on the chart. Take care that the score mark does not actually extend all the way to the side faces or chipping may result. Each micrograph represents a square of 1. If the surface is uneven or contains any severe cutting artifacts, repeat the cutting operation with a new razor blade. However, before using either of these latter methods, the stock should be pressed out to eliminate most of the air holes.