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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R2663 test is applicable to the analysis of carbon black dispersion in compounds that contain other? If pieces other than 2-mm sheets are used, they should? Care should be taken to avoid excessive?
ASTM D – 14 Standard Test Methods for Carbon Black—Dispersion in Rubber
If at all possible, examine compounds of this type also by the agglomerate count method, at least until sufficient experience is gained to recognize dispersion differences with the Visual Inspection Method.
Preparation of Glass Knives The values for A are always positive, and those for B are negative because the intercept is a fraction. A wash in a astmm detergent is generally advisable. A sheet of plate glass on the surface of the vibration isolator is suitable for this purpose.
A typical unmilled latex masterbatch ULM is shown on the chart. Each micrograph represents a asgm of 1. D corner on one of the side faces that was formed during the preparation of the glass strips.
Then, the volume percentage of black can be calculated from the following simpli?
Standard – Standard Test Methods for Carbon Black-Dispersion in Rubber ASTM D –
All through the entire sectioning operation the knife edge should be continually kept wet with solvent xylene or naphthaapplied by brush. NOTE 2—Most agglomerates are not composed entirely of carbon black.
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. These pressure points can be formed with small strips of plastic tape if they are not already incorporated into the jaw surfaces of the pliers.
A and B are constants for each speci? A large sheet of glass should? The tank should be supplied with a siphon?
The values for dispersion index are inversely proportional to F2H. F 5 the number of roughness peaks per cm, and H 5 the number average peak height,?
To accomplish this, press the rubber into a slab between thin sheets of plastic in a mold at a pressure of about 1. However, as a safety precaution, it is recommended that the stage be specially reinforced to withstand the high vapor pressure of liquid carbon dioxide.
The front edges of the plier jaws should be perpendicular to the score line. The percentage ranges and agglomerate size categories are listed in Table 1 and Table 2.
Normally, the visual dispersion ratings indicate the following levels of compound quality: Record the values for these two points.
Then, manually advance the specimen upward so that its top surface almost reaches the level of the knife. Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. Careful manipulation of the solvent wet brush will unroll astn spread the section out? Use a cutting die, if available. 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?
A superscript epsilon e indicates an editorial change since the last revision or reapproval. Lower or higher values for C may be used at the discretion of the operator. Historical Version s c2663 view previous versions of standard. 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. If the constants are not available for the rubber formulation that is d266 be analyzed, see Section Mill and cure in accordance with Practice D The surface to be examined is formed with a smooth cutting stroke using a sharp, hot knife a standard type knife heater may be employed.
The total cross-sectional area of all agglomerates 5? These instances 2d663 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.
Then, using tongs, immerse the entire sample mount in a Dewar? Fracture with the glass pliers as before. In instances of high agglomerate frequency, the surface of stocks of this type may show a general roughness or? Such samples asgm quite tedious to measure. This selection may depend on the type of rubber formulation or the size range of agglomerates that are pertinent to speci? There is no satisfactory test method presently available for determining the precise asttm of asgm black in each agglomerate.
If the section tends to slip on the slide, hold one corner lightly with a mounted needle.
Standard Test Methods for Carbon Black—Dispersion in Rubber
Last previous edition D — In extreme cases, where U is very large, negative dispersion ratings are therefore possible. Dispersion is evaluated by measuring with a light microscope the percentage area covered by black agglomerates in microtomed sections of the compound. The section will be curled up in a small tight roll. This test method cannot s2663 used for compounds that contain?
Calculation and Interpretation of Results Normally, the visual dispersion ratings d663 the following levels of compound quality: Precision and Bias