ASTM D2663 PDF

ASTM D ASTM D a. ASTM D A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

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ASTM D ASTM D a. ASTM D A number in parentheses indicates the year of last reapproval. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

Scope 1. Summary of Test Method 4. The dispersion level of the carbon black is compared against a series of? 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. Normally, the visual dispersion ratings indicate the following levels of compound quality: Visual Dispersion Rating 4 3 2 1 to to to to 5 4 3 2 Classi? The values in parentheses are for information only.

It is the responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. Referenced Documents 2. Scope 3. Ratings are made against a set of standard photographs Fig. This test method cannot be used for compounds that contain? Current edition approved Oct. Published December Originally published as D — 67 T. Last previous edition D — Request Adjunct No.

Apparatus 6. Test Specimen 7. Tear it so that a fresh surface is exposed. The tear may be initiated by a small cut. The most nearly? Mill and cure in accordance with Practice D Then proceed as in 7. Then cure and proceed as above. To accomplish this, press the rubber into a slab between thin sheets of plastic in a mold at a pressure of about 1. Care should be taken to avoid excessive? 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 most nearly smooth and? Number of Tests 8. If convenient, more than one operator should rate the samples. D 9. Procedure 9. Keep the magni? Then assign the most closely matched numerical rating to each compound being rated. In borderline cases, use fractional ratings, for example, 31? 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.

Certain compounds for example, NR and IR are particularly prone to very small black agglomerations which are difficult to resolve by the Visual Inspection Method. In instances of high agglomerate frequency, the surface of stocks of this type may show a general roughness or? Differences are best resolved at somewhat higher magni? 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.

This use of a control compound is also advisable. This is best prepared by individual operators, since dispersion requirements may vary greatly for different types of compounds.

The control sample should represent a minimum acceptable dispersion level for the type of compound being rated. 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?

Prepare a fresh surface on the control as often as necessary to ensure cleanliness. Report Use fractional ratings when necessary. Report the? Precision and Bias Scope Dispersion is evaluated by measuring with a light microscope the percentage area covered by black agglomerates in microtomed sections of the compound. Since this test method involves direct measurement, it is quantitative and more accurate than the visual test method. The test is applicable to the analysis of carbon black dispersion in compounds that contain other?

Summary of Test Method The total cross-sectional area of all agglomerates 5? Apparatus Steel knives may also be employed, according to the preference of the operator. The TFE-? The threaded part of the brass screw shall be 15 mm in diameter and shall extend into the center of the TFE-?

Coarse, expansion-type threads should be used to prevent splitting of the TFE-? The head of the brass screw shall be 18 mm in diameter and shall extend 3 mm above the TFE-? The top of the screw head shall be cross-hatched with? D enough subsequently to form buttons about 10 mm in diameter and about 2 to 3-mm deep thoroughly with dicumyl peroxide. OE-SBR rubbers require about 30 to min cure. BR requires about 10 to min cure.

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. Other alternative approaches for curing high unsaturation polymers without actually mixing in curatives are 1 high-energy radiation and 2 chemical treatment with sulfur monochloride.

However, before using either of these latter methods, the stock should be pressed out to eliminate most of the air holes. Cure in accordance with Practice D Test Specimen Use a cutting die, if available. If a die is not used, the specimen length and width should be recorded using a measuring magni? Preparation of Glass Knives Thickness should be preferably about 6 mm.

A large sheet of glass should? Fracture in this manner is preferred over simply breaking off mm sections one at a time. Uneven strains are encountered in the latter procedure, and irregularities may occur on the side faces on which the knife edge will be formed. Prior to fracture, it is also important that the glass be free of dirt.

A wash in a liquid detergent is generally advisable. Take care that the score mark does not actually extend all the way to the side faces or chipping may result. Next, fracture along the score line using the glass pliers. The upper jaw of the pliers should have raised pressure points at both ends of the gripping surface, while the lower jaw should have a raised area in the center.

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. To induce fracture, grasp the glass with the pliers so that the pressure point on the lower jaw is under the score mark near the center of the strip.

The front edges of the plier jaws should be perpendicular to the score line. Firm pressure will readily cause fracture. 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.

This should include a movable specimen stage and white light source with variable intensity. Lenses should include two wide? Taking into account microscope tube corrections, objectives should be selected so that magni? For photomicrographs a 43 plane objective and a periplanatic eyepiece are recommended. A mechanical vernier stage can also be used for this purpose.

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Historical Version s - view previous versions of standard. Work Item s - proposed revisions of this standard. More D 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. Normally, the visual dispersion ratings indicate the following levels of compound quality:. Four test methods are described as follows:. Test Method A—Visual Inspection.

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