ASTM D6260-98

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Designation:D6260–98
Standard Test Method for
Gravimetric Determination of Carbon Black in Nylon
Materials (PA)
This standard is issued under the fixed designation D 6260; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 5. Apparatus
1.1 This test method is applicable to the determination of 5.1 Normal Laboratory Apparatus.
carbon black in a specific class of nylon materials, weather 5.2 Filtering Apparatus, capable of containing fine particles
stable, listed in the property tables of Classification System of carbon black. Systems that have been used successfully
D 4066. include the following:
1.2 The values stated in SI units are to be regarded as the 5.2.1 Millipore Filter Holder, Glass Microanalysis System
standard. B, Catalog Number XX100253, with Nucleapore Polycarbon-
1.3 This standard does not purport to address all of the ate Filters, Type PC, 0.2 µm, 25 mm diameter.
safety concerns, if any, associated with its use. It is the 5.2.2 Good Crucible with Glass Microfiber Filters, What-
responsibility of the user of this standard to establish appro- man Catalog Number 1825–024, 2.4 cm GF/F.
priate safety and health practices and determine the applica- 5.3 Drying Oven, capable of minimum 70°C temperature.
bility of regulatory limitations prior to use. See Note 2 and
6. Reagents
Note 3 for specific hazard statements.
6.1 Acids for the hydrolysis step should be chosen by the
NOTE 1—There is no similar or equivalent ISO standard.
user for the specific nylon under test.
6.1.1 For Nylon 6 and 66—1 + 1 hydrochloric acid. Prepare
2. Referenced Documents
inahoodbyslowlymixingonepartreagentgradeHClintoone
2.1 ASTM Standards:
2 part deionized water.
D 833 Terminology Relating to Plastics
6.1.2 For Nylon 612—1 + 1 nitric acid. Prepare as in 6.1.1.
D 1898 Practice for Sampling of Plastics
D 4066 Classification System for Nylon Materials NOTE 2—Use caution. Never mix water into an acid. Continually mix,
slowly, in an open flask, when adding acid to water.
3. Terminology
NOTE 3—Hydrochloric and nitric acids are corrosive liquids. Wear
rubber gloves, rubber apron, and chemical goggles when handling the
3.1 Definitions—Terms applicable to this test method are
acids and their solutions.
defined in Terminology D 833.
7. Test Specimens
4. Significance and Use
7.1 Sample the material in accordance with Practice D 1898
4.1 Carbon black is an additive in a specific class of nylon
7.2 Specimens should contain less than 0.3 % moisture to
materials, weather stable, listed in the property tables of
avoid weighing errors.
Classification System D 4066.
4.2 This test method determines the presence and level of
8. Procedure
carbon black to ensure the suitability of the nylon material in
8.1 Perform the hydrolysis step in a hood.
weatherable applications.
8.2 Into a clean, dry, 250 ml Erlenmeyer flask, transfer a
sample (weighed to the nearest 0.0001 g) that will yield 20 to
100 mg of carbon black. Record the sample weight.
This test method is under the jurisdiction of Committee D-20 on Plastics and is
8.3 Add, by graduated cylinder, 100 mL of the appropriate
the direct responsibility of Subcommittee D20.15 on Nylon Materials.
acid solution and attach a water-cooled condenser.
Current edition approved May 10, 1998. Published April 1999.
8.4 Apply heat until the sample solution just boils. Continue
Annual Book of ASTM Standards, Vol 08.01.
Annual Book of ASTM Standards, Vol 08.02. slight boiling for 2 to 3 h.
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