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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Standard Test Methods for Carbon Black—Dispersion in Rubber
Ratings are made against a set of standard photographs Fig. Uneven strains are encountered in the latter procedure, and irregularities may occur on the side faces on which the knife edge will be formed. The top of the screw head shall be cross-hatched with? However, before using either of these latter methods, the stock should be d26663 out to eliminate most of the air holes.
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 d22663. 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. The surface to be examined is formed with a smooth cutting stroke using a sharp, hot aztm a standard type knife heater may be employed. A sheet of plate glass on the surface of the vibration isolator is suitable for this purpose.
Continue until the stylus makes contact with the reference surface. If pieces other than 2-mm sheets are used, they should? The overall range of dispersion levels should be similar to the range of values listed in 6. However, it will be noted that some of the micrographs are missing from the coarser agglomerate categories of ranges A, B, and C simply because the percentage rating falls out of the range at that size level.
Each micrograph represents a square of 1. 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.
Steel knives may also be employed, according to the preference of the operator.
Standard – Standard Test Methods for Carbon Black-Dispersion in Rubber ASTM D –
An accurate description of this appearance is often meaningful in determining the cause of a poor masterbatch letdown. No other units of measurement are included in this standard. BR requires about 10 to min cure.
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? D enough subsequently to form buttons about 10 mm in diameter and about 2 to 3-mm deep d26633 with dicumyl peroxide.
The stylus will move outward 2. 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.
Then cover the sections with cover glasses, and seal with tape, or a bit of cement at each corner. The control sample should represent a minimum acceptable dispersion level for the type of compound being rated.
Other d26663 approaches for curing high unsaturation polymers without actually mixing in curatives are 1 high-energy radiation and 2 chemical treatment with sulfur monochloride. More detailed information regarding freezing times is best compiled by individual operators on their own particular specimens. In instances where a bimodal agglomerate distribution exists, two categories may be listed.
The percent dispersion values obtained by Test Method B are used to establish the dispersion d6263 scale for different rubber formulations. Take care again that the score mark does not go all the way out to the edges of the glass. Fracture with the glass pliers as before. For specimens that are too soft to be microtomed at liquid CO2 temperatures, pour a little liquid nitrogen onto the specimen block while it is in position on the freezing stage.
Stay within 1 to 2 mm of each side. Draw the best regression line atm select two different points along the line where the respective percent dispersion and F 2H values can be seen clearly. Order PCN Bias, therefore, cannot be determined. Reagents and Materials U 5 total number of graticule squares that are at least half? The values for dispersion index are inversely proportional to F2H.
Such stocks are extremely poor and may simply be classi? If you feel that your comments have not received a fair hearing you should make your views known to the ASTM Committee on Standards, at the address shown below.
Standard Test Methods for Carbon Black-Dispersion in Rubber
Then, the volume percentage of black can be calculated from the following simpli? This is best prepared by individual operators, since dispersion requirements may vary greatly for different types of compounds. There is no satisfactory test method presently available for determining the precise amount of carbon black in each agglomerate. If convenient, more than one operator should rate the samples. For each aastm rating the amount of undispersed black is the same throughout the six agglomerate size categories.
Remove the specimen holder from the cutter, and discard the used blade and the piece of rubber cut from the specimen.
ASTM D – 14 Standard Test Methods for Carbon Black—Dispersion in Rubber
A mechanical vernier stage can also be used for this purpose. Also avoid sections that are very thin as some of the clumps of carbon black may be brushed out.
Next, reimmerse the specimen mount in liquid nitrogen for the required amount of time. This constant eliminates high frequency electronic or vibrational noise which may be dependent on the location of the instrument. These constants are speci? This will start the stylus tracking in an alternating in and out direction above the horizontal reference surface.
Four test methods are described as follows: These instances would include in particular the evaluation of compounds at very low dispersion levels which are known to be of poor quality by simple visual inspection of the sections.
Prior to fracture, it is also important that the glass be free of dirt.