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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The longest dimension of the specimen should be cut along the direction in which the rubber slab was sheeted out. If the embedding is satisfactory, it is advisable aatm use a razor blade to trim off any excess mucilage from the top and sides of the specimen.
Standard – Standard Test Methods for Carbon Black-Dispersion in Rubber ASTM D –
If convenient, more than one operator should rate the samples. 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.
Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard.
Historical Version s – view previous versions of e2663. IIR vulcanizates containing 50 phr of N carbon black or oil extended SBR stocks with 50 phr d263 a N black require about a 1-min freeze. Next, reimmerse the specimen mount in liquid nitrogen for the required amount of time. Precision and Bias This selection may depend on the type of rubber formulation or the size range of agglomerates that are pertinent to speci? A typical unmilled latex masterbatch ULM is shown on the chart.
Standard Test Methods for Carbon Black-Dispersion in Rubber
Firm pressure will readily cause fracture. Three test methods are described as follows: Cure in accordance with Practice D Unvulcanized specimens should be recooled to?
For each letter rating the amount of undispersed black is the same throughout the six agglomerate size categories. The control sample should represent a minimum acceptable dispersion level for the type of compound being rated. Other alternative approaches x2663 curing high unsaturation polymers without actually mixing in curatives are 1 high-energy radiation and 2 chemical treatment with sulfur monochloride.
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. For maximum accuracy, the black volume percentage can be calculated from the following expression: Last previous edition D — The test result range measured dispersion index was from approximately 35 to To facilitate a simple estimation asfm the average agglomerate size, FIG.
They may contain substantial amounts of polymer or extender oil. The threaded part of the brass screw shall be 15 mm in diameter and shall extend into the center of 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?
ASTM D – 14 Standard Test Methods for Carbon Black—Dispersion in Rubber
It must also be assumed that the absolute level of all the percent dispersion values is probably higher than reported. Order PCN In instances of high agglomerate frequency, the surface of stocks of astj type may show a general roughness or?
This test method is applicable to rubber compounds containing all types of carbon blacks over a wide range of loadings.
Then assign the most closely matched numerical rating to each compound being rated. However, for halogenated hydrocarbons such as CR or nonhydrocarbons such as silicone rubber, d26663 actual density of the polymer should be taken into consideration. Vulcanized samples must d2636 employed because of the solvent used to uncurl the thin sections. Record the values for these two points. Take care that the glue comes up to the top edges of the specimen on all four sides.
Standard Test Methods for Carbon Black—Dispersion in Rubber
These average values represent a single test result. NOTE 2—Most agglomerates are not composed entirely of carbon black. Then, manually advance the specimen upward so that its top surface almost reaches the level of the knife.
Thickness should be preferably about 6 mm. Steel knives may also be employed, according to the preference of the operator. If the constants are not available for the rubber formulation that is to be analyzed, see Section Deposit the sections in a petri dish of xylene or naphtha as they are cut. Mill and cure in accordance with Practice D Prepare zstm fresh surface on the control as often as necessary to ensure cleanliness.
Test Method C—Microroughness Measurement.