ASTM D7724-11

Standard Test Method for Carbon Black<char: emdash>Non-Dispersible Matter by Mechanical Flushing (NDM)

SIGNIFICANCE AND USE
The quantity of non-dispersible matter of carbon black is important in some molded or extruded products as it may relate to the surface appearance of those products. The maximum amount of non dispersible matter and the minimum size of the particles to be analyzed in each application is normally determined and agreed to between the user and the producer.
SCOPE
1.1 This test method covers the determination of non-dispersible matter after mechanical water flushing of regular untreated carbon blacks. It may not be applicable to oil-treated carbon blacks because the oil would prevent proper wetting of the black by water.
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This standard does not purport to address all of the safety concerns, if any, associated with its use. 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.

General Information

• Status: Historical
• Publication Date: 31-Oct-2011
• Technical Committee: D24 - Carbon Black
• Drafting Committee: D24.31 - Non-Carbon Black Components of Carbon Black

Relations

• Replaced By: ASTM D7724-11(2016) - Standard Test Method for Carbon Black&#x2014;Non-Dispersible Matter by Mechanical Flushing (NDM)
• Effective Date: 01-Jun-2016

Standards Content (Sample)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
Contact ASTM International (www.astm.org) for the latest information
Designation: D7724 − 11
StandardTest Method for
Carbon Black—Non-Dispersible Matter by Mechanical
Flushing (NDM)
This standard is issued under the fixed designation D7724; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope 4. Significance and Use
1.1 This test method covers the determination of non-
4.1 The quantity of non-dispersible matter of carbon black
dispersible matter after mechanical water flushing of regular
is important in some molded or extruded products as it may
untreated carbon blacks. It may not be applicable to oil-treated
relate to the surface appearance of those products. The maxi-
carbon blacks because the oil would prevent proper wetting of
mum amount of non dispersible matter and the minimum size
the black by water.
of the particles to be analyzed in each application is normally
determined and agreed to between the user and the producer.
1.2 The values stated in SI units are to be regarded as
standard. No other units of measurement are included in this
5. Apparatus
standard.
1.3 This standard does not purport to address all of the
5.1 Sieve Apparatus, as shown in Fig. 1.
safety concerns, if any, associated with its use. It is the
5.2 Balance, with a sensitivity of 0.01 g.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
5.3 Analytical Balance, with a sensitivity of 0.1 mg.
bility of regulatory limitations prior to use.
5.4 Oven, gravity-convection type, capable of temperature
2. Referenced Documents regulation within 61°C at 125°C and temperature uniformity
2 within 65°C.
2.1 ASTM Standards:
D1799 Practice for Carbon Black—Sampling Packaged
5.5 Sieves, diameter 100 mm, of either phosphor bronze or
Shipments
stainless steel. The sieve shall be in accordance with Specifi-
D1900 Practice for Carbon Black—Sampling Bulk Ship-
cation E11. The sieve size to be used shall be agreed upon
ments
between the purchaser and the carbon black manufacture.
D4483 Practice for Evaluating Precision for Test Method
5.6 Weighing Dishes.
Standards in the Rubber and Carbon Black Manufacturing
Industries
6. Precautions
E11 Specification for Woven Wire Test Sieve Cloth and Test
Sieves
6.1 Install the apparatus as described in the manufacturer’s
instructions and keep it clean at all times to prevent contami-
3. Summary of Test Method
nation.
3.1 A sample of carbon black is mechanically flushed with
6.2 Examinethesieveseachtimetheyareusedtomakesure
water through a wire-mesh screen of a specified size until all
that no cracks or holes have developed.
that remains is a non-dispersible matter of carbon black. The
non-dispersible matter is dried, weighed, and the amount of
7. Sampling
residue is expressed as mg/kg (ppm) of the original sample.
7.1 Samples shall be taken in accordance with Practice
D1799 or Practice D1900.
This test method is under the jurisdiction ofASTM Committee D24 on Carbon
Black and is the direct responsibility of Subcommittee D24.31 on Non-Carbon
Black Components of Carbon Black.
Current edition approved Nov. 1, 2011. Published November 2011. DOI:
10.1520/D7724-11. The sole source of supply of the apparatus known to the committee at this time
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