ASTM D8043-16

Standard Guide for Carbon Black—Shelf Life

SIGNIFICANCE AND USE
3.1 This guide defines the shelf life of carbon black when stored under proper conditions.
SCOPE
1.1 This guide defines the shelf life of carbon black.

General Information

• Status: Historical
• Publication Date: 31-May-2016
• ICS: 87.060.10 - Pigments and extenders
• Technical Committee: D24 - Carbon Black
• Drafting Committee: D24.67 - Sustainability

Relations

• Referred By: ASTM D6915-23 - Standard Practice for Carbon Black—Evaluation of Standard Reference Blacks
• 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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D8043 − 16
Standard Guide for
1
Carbon Black—Shelf Life
This standard is issued under the fixed designation D8043; 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 months), depending on the ambient humidity and the surface
area of the carbon black, see 4.4. Iodine Number can change
1.1 This guide defines the shelf life of carbon black.
over an extended period (years) due to a slow increase in the
oxygen content on the surface of the carbon black. This
2. Referenced Documents
phenomenon is primarily observed with tread grades (N100 –
2.1 ASTM Standards:
N300 series) and other high surface area carbon blacks, and
D1509 Test Methods for Carbon Black—Heating Loss
manifests itself by a slowly decreasing Iodine Number, al-
D1510 Test Method for Carbon Black—Iodine Adsorption
though the actual surface area of the carbon black remains
Number
unchanged. For more details about the aging effect on iodine
D4821 Guide for Carbon Black—Validation of Test Method
number, see subsection 5.1.1 of Guide D4821.
Precision and Bias
D6915 Practice for Carbon Black—Evaluation of Standard
4.2 The same reasoning for the shelf life of SRBs extends to
Reference Blacks commercial carbon black. It should be noted that the slight
change in Iodine Number over an extended period does not
3. Significance and Use
affect actual surface area properties and in-rubber performance
3.1 This guide defines the shelf life of carbon black when of the carbon black.
stored under proper conditions.
4.3 The in-rubber properties of a wide range of carbon black
grades have shown no significant change over a 4 year period,
4. Carbon Black Shelf Life
see Table 1 and Table 2. This is an on-going study and will be
4.1 In accordance with Practice D6915, the shelf life of
updated as future data is collected.
Standard Reference Blacks (SRBs) is defined as indefinite
4.4 In cases where the carbon black moisture level has
when stored in a manner that protects it from liquid water or
increased over time, heating the carbon black at 125°C for an
high humidity environments. The only two properties of
adequate amount of time will remove the moisture and render
carbon black known to change over time are moisture (Test
the material fit for use.
Methods D1509) and Iodine Number (Test Method D1510).
The moisture content can change over the short-term (weeks or
4.5 Based on studies by ASTM Committee D24, the shelf
life of carbon black is indefinite.
1
This guide is under the jurisdiction ofASTM Committee D24 on Carbon Black
and is the direct responsibility of Subcommittee D24.67 on Sustainability.
5. Keywords
Current edition approved June 1, 2016. Published June 2016. DOI: 10.1520/
D8043-16. 5.1 carbon black; shelf life
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

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D8043 − 16
TABLE 1 In-Rubber Properties of Tread Grade Carbon Blacks Over a 4 Year Period
ASTM D3192 (NR) N115 N234 N330
Diff in Diff in Diff in
Absolute ∆IRB-8 Absolute ∆IRB-8 Absolute ∆IRB-8
∆IRB ∆IRB ∆IRB
Unit 2011 2015 2011 2015 values 2011 2015 2011 2015 values 2011 2015 2011 2015 values
Viscosity ML 1 + 4 – 83 79 9 11 2 84 81 12 13 1 72 68 –2 0 2.0
Cure Data ∆min dNm 3.8 3.6 0.6 0.9 0.3 3.7 3.4 0.6 0.7 0.1 2.9 2.7 –0.3 0.0 0.3
∆max dNm 18.8 19.2 0.3 1.3 1.0 20.2 20.4 1.7 2.5 0.8 19.1 18.3 0.4 0.4 0.0
∆max-∆min dNm 15.0 15.6 –0.3 0.4 0.7 16.5 17.0 1.0 1.7 0.7 16.3 15.6 0.7 0.4 –0.3
t10% min 3.2 3.4 0.4 0.6 0.2 2.6 2.5 –0.3 –0.2 0.1 2.7 3.0 –0.2 0.2 0.4
t90% min 34.9 30.5 1.6 4.7 3.1 29.5 23.9 –4.2 –1.8 2.4 31.0 24.7 –2.8 –1.1 1.7
Mooney
t5 min 16.2 16.7 2.8 4.2 1.4 11.5 11.5 –2.1 –1.1 1.0 13.9 13.4 0.5 0.9 0.4
scorch
t35 min 21.4 21.1 4.0 5.0 1.0 14.9 14.5 –2.8 –1.6 1.2 17.6 17.0 0.3 0.9 0.6
Stress-
M300% MPa 9.2 10.3 –3.6 –3.4 0.2 12.9 14.0 –0.2 0.4 0.6 12.9 13.4 0.2 –0.2 –0.4
strain
EaB % 560 560 85 95 10 470 450 –15 –15 0 470 500 0 35 35
Tensile MPa 20.1 21.6 –0.5 0.5 1.0 21.0 20.9 –0.9 –0.2 0.7 20.6 22.1 0.3 1.0 0.7
Shore A – 64 67 –1.5 0.5 2.0 68 70 2 4 2 66 66 0 0 0.0
Dispersion no. of peaks – 67 24 26 12 –14 68 23 43 11 –32 51 13 1 1 0
peak area % 2.8 0.8 1.1 0.6 –0.5 2.4 0.6 1.6 0.4 –1.2 2.4 0.4 0.2 0.2 0.0
RPA tan d 60°C – 0.25 0.27 0.04 0.05 0.01 0.23 0.25 0.02 0.03 0.01 0.19 0.22 –0.01 0.00 0.01
G* MPa 1.71 1.70 0.03 0.09 0.06 1.96 1.94 0.29 0.33 0.04 1.76 1.68 0.04 0.07 0.03
US units M300% psi 1081 1210 –423 –394 29 1515 1645 –23 41 64 1515 1574 23 –29 –52
rel. to IRB-8 % 526 526 80 89 9 442 423 –14 –14 0 442 470 0 33 33
Tensile psi 2799 3008 –70 7
...