ASTM D7772-15(2019)
(Test Method)Standard Test Method for Carbon Black Extractables – Absorbance of Cyclohexane Extract
Standard Test Method for Carbon Black Extractables – Absorbance of Cyclohexane Extract
SIGNIFICANCE AND USE
4.1 This procedure serves as a screening process for carbon blacks used in the manufacturing of products that are to come into contact with food. The cyclohexane extract absorbance at 386 nm must be less than 0.10 for a 50 mm cuvette in order to fulfill various regulatory requirements.
SCOPE
1.1 This method covers the determination of extinction (absorbance) of carbon black cyclohexane extract at 386 nm using a UV spectrophotometer.
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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
General Information
Relations
Standards Content (Sample)
This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7772 − 15 (Reapproved 2019)
Standard Test Method for
Carbon Black Extractables – Absorbance of Cyclohexane
1
Extract
This standard is issued under the fixed designation D7772; 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 method covers the determination of extinction
4.1 This procedure serves as a screening process for carbon
(absorbance) of carbon black cyclohexane extract at 386 nm
blacks used in the manufacturing of products that are to come
using a UV spectrophotometer.
into contact with food. The cyclohexane extract absorbance at
386 nm must be less than 0.10 for a 50 mm cuvette in order to
1.2 The values stated in SI units are to be regarded as
fulfill various regulatory requirements.
standard. No other units of measurement are included in this
standard.
5. Apparatus
1.3 This standard does not purport to address all of the
5.1 Spectrophotometer, 20 nm maximum spectral bandpass,
safety concerns, if any, associated with its use. It is the
capable of measuring absorbance at 386 nm.
responsibility of the user of this standard to establish appro-
priate safety, health, and environmental practices and deter-
5.2 Cuvettes, with an optical light path of 50 mm.
mine the applicability of regulatory limitations prior to use.
5.3 Balance, analytical, sensitivity 0.01 g.
1.4 This international standard was developed in accor-
dance with internationally recognized principles on standard-
5.4 Filter Paper, with a particle retention in liquid less than
ization established in the Decision on Principles for the
2 µm.
Development of International Standards, Guides and Recom-
5.5 Glass Filtering Funnels, 75 mm diameter at top.
mendations issued by the World Trade Organization Technical
3
Barriers to Trade (TBT) Committee. 5.6 Volumetric Flask, 100 cm .
5.7 Lens Cleaning Tissue, lint free.
2. Referenced Documents
2 5.8 Timer, with 1 s divisions.
2.1 ASTM Standards:
D4483 Practice for Evaluating Precision for Test Method 5.9 Oven, gravity-convection type, capable of temperature
Standards in the Rubber and Carbon Black Manufacturing
regulation of 125 6 5°C.
Industries
5.10 Desiccator.
3. Summary of Test Method
5.11 Asagoodlaboratorypractice,itcouldbesuggestedthe
use of a Neutral Density Filter with a spectral absorbance
3.1 Acarbon black sample is gently agitated in cyclohexane
calibrated at 386 nm to ensure the spectrophotometer is
at room temperature to remove any extractable material. The
correctly calibrated.
mixture is left standing in the dark for 24 h at room tempera-
ture. The carbon black is separated from the cyclohexane by
6. Reagents and Materials
filtration, with subsequent determination of the extinction of
the filtrate at 386 nm using a 50-mm cuvette.
6.1 Cyclohexane, analytical reagent grade.
7. Hazards
1
This test method is under the jurisdiction ofASTM Committee D24 on Carbon
Black and is the direct responsibility of Subcommittee D24.66 on Environment,
7.1 This test involves hazardous materials, operations and
Health, and Safety.
equipment. This procedure does not attempt to address the
Current edition approved Dec. 1, 2019. Published January 2020. Originally
safety problems associated with this test. A hazards review
approved in 2011. Last previous edition approved in 2015 as D7772 – 15. DOI:
10.1520/D7772-15R19.
mustbeconductedbyallpersonnelperformingthetest.Itisthe
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
responsibility of the user to review all MSDS, manuals and
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
hazards procedures and establish the appropriate safety mea-
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. sures.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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D7772 − 15 (2019)
TABLE 1 Precision Parameters for Test Method D7772, Carbon Black Extractables-Absorbance of Cyclohexane Extract (Type 1 Preci-
sion)
Number of Unit Absor-
Material Sr r (r) SR R (R)
Labs bance
N772 4 0.008 0.005 0.015 203.78 0.007 0.020 269.58
N683 (SRB
4 0.011 0.004 0.011 101.72 0.009 0.026 249.15
8F)
Average 0.009
Pooled 0.005 0.013 146.05 0.008 0.024 259.90
3
8. Calibration, Standardization, and Environmental 9.3 Weigh 1.00 6 0.01 g sample and transfer to a 100 cm
Con
...
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