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
Steel knives may also be employed, according to the preference of the operator. A wash in a liquid detergent is generally advisable.
Reagents and Materials Then, manually advance the specimen upward so that its top surface almost reaches the level of the knife. Lower or higher values for C may be used at the discretion of the operator.
Also, if too much time is taken, the rubber specimen will soften and will have to be refrozen. In instances where a bimodal agglomerate distribution exists, two categories may be listed.
Mill and cure in accordance with Practice D 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.
Firm pressure will readily cause fracture. Take care again that the score mark does not go all the way out to the edges of the glass. The dispersion level of the carbon black is compared against a series of? The measured roughness factor is used to derive a dispersion index which is awtm on the same scale 0 to as Test Method B.
Standard Test Methods for Carbon Black—Dispersion in Rubber
Test Method B—Agglomerate Count. Uneven strains are encountered in the latter procedure, and irregularities may occur on the side faces on which the knife edge will be formed.
For photomicrographs a 43 plane objective and a periplanatic eyepiece are recommended. The test result range measured dispersion index was from approximately 35 to Last previous edition D — This should include a movable specimen stage and white light source with variable intensity.
For maximum accuracy, the black volume percentage can be calculated from the following expression: This test method is applicable to rubber compounds containing all types of carbon blacks over a wide range of loadings.
Stay within 1 to 2 mm of each side. This will start the stylus tracking in an alternating in and out direction above ast horizontal reference surface.
It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the e2663 of regulatory limitations prior to use.
Then, the volume percentage of black can be calculated from the following simpli? Bias, therefore, cannot be satm. To facilitate a simple estimation of the average agglomerate size, FIG. All through the entire sectioning operation the knife edge should be continually kept wet with solvent xylene or naphthaapplied by brush.
Count all squares that are at least half covered by an agglomerate of carbon black.
ASTM D – 14 Standard Test Methods for Carbon Black—Dispersion in Rubber
e2663 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. A rating of 5 indicates a state of dispersion developing near maximum properties, while a rating of 1 would indicate a state of dispersion developing considerably depressed properties.
Straight edges are most desirable but not absolutely essential. 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. The section will be curled up in a small tight roll. The percent dispersion values obtained by Test Method B are used to establish the dispersion index scale for different rubber formulations. Continue brushing gently to remove all wrinkles.
Then, score the resultant mm square of glass across the diagonal, awtm the mark a bit off center so that the potential knife edge will be formed slightly away from the FIG. This represents an average of the? However, for halogenated hydrocarbons such as CR or nonhydrocarbons such as silicone rubber, the actual density of the polymer should be taken into consideration. These pressure points can be formed with small strips of plastic tape if they are not already incorporated into wstm jaw surfaces of the pliers.
Differences are best resolved at somewhat higher magni? Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.
Care should be taken to avoid asm Prior to fracture, it is also important that the glass be free of dirt. This constant eliminates high frequency electronic or vibrational noise which may be dependent on the location of the instrument. Order PCN S 5 area swelling factor from the action of the solvent used to uncurl the asym a ratio of the section area after swelling to the area before swellingand L 5 volume percentage of black in the compound.
Careful manipulation of the solvent wet brush will unroll and spread the section out? 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 d22663
Summary of Test Method