ASTM D1765-05a

Standard Classification System for Carbon Blacks Used in Rubber Products

SCOPE
1.1 This classification system covers the classification of rubber-grade carbon blacks by the use of a four-character nomenclature system. The first character gives some indication of the influence of the carbon black on the rate of cure of a typical rubber compound containing the black. The second character gives information on the average surface area of the carbon black. The last two characters are assigned arbitrarily.
1.2 All rubber-grade carbon blacks for which a number is currently assigned at the time of publication of this classification system are listed in together with some of their typical properties. ASTM classification numbers ("N" or "S" designation) not listed in have either been withdrawn or are not currently assigned. The use of inactive or unassigned N or S designations is prohibited until such a time as the designation is officially reactivated or assigned by Subcommittee D24.41
1.3 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.4 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: 30-Sep-2005
• ICS: 83.040.20 - Rubber compounding ingredients
• Technical Committee: D24 - Carbon Black
• Drafting Committee: D24.41 - Carbon Black Nomenclature and Terminology

Relations

• Replaces: ASTM D1765-05 - Standard Classification System for Carbon Blacks Used in Rubber Products
• Effective Date: 01-Oct-2005
• Replaced By: ASTM D1765-05ae1 - Standard Classification System for Carbon Blacks Used in Rubber Products
• Effective Date: 01-Oct-2005
• Referred By: ASTM D3493-21 - Standard Test Method for Carbon Black—Oil Absorption Number of Compressed Sample (COAN)
• Effective Date: 01-Oct-2005
• Referred By: ASTM D3053-23 - Standard Terminology Relating to Carbon Black
• Effective Date: 01-Oct-2005
• Referred By: ASTM D4583-21 - Standard Practice for Carbon Black—Calculation of Process Indexes From an Analysis of Process Control Data
• Effective Date: 01-Oct-2005
• Referred By: ASTM E1136-19 - Standard Specification for P195/75R14 Radial Standard Reference Test Tire
• Effective Date: 01-Oct-2005
• Referred By: ASTM D4821-20 - Standard Guide for Carbon Black—Validation of Test Method Precision and Bias
• Effective Date: 01-Oct-2005
• Referred By: ASTM D5817-20 - Standard Practice for Carbon Black, Pelleted—Reduction, Blending, and Drying of Gross Samples for Testing
• Effective Date: 01-Oct-2005
• Referred By: ASTM D2414-23 - Standard Test Method for Carbon Black—Oil Absorption Number (OAN)
• Effective Date: 01-Oct-2005

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: D 1765 – 05a
Standard Classification System for
1
Carbon Blacks Used in Rubber Products
This standard is issued under the fixed designation D 1765; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope D 412 Test Methods for Vulcanized Rubber and Thermo-
plastic Elastomers—Tension
1.1 This classification system covers the classification of
D 1508 Test Method for Carbon Black, Pelleted Fines and
rubber-grade carbon blacks by the use of a four-character
Attrition
nomenclature system.The first character gives some indication
D 1510 Test Method for Carbon Black—Iodine Adsorption
of the influence of the carbon black on the rate of cure of a
Number
typical rubber compound containing the black. The second
D 1513 Test Method for Carbon Black, Pelleted—Pour
character gives information on the average surface area of the
Density
carbon black. The last two characters are assigned arbitrarily.
D 1514 Test Method for Carbon Black—Sieve Residue
1.2 All rubber-grade carbon blacks for which a number is
D 2084 Test Method for Rubber Property—Vulcanization
currently assigned at the time of publication of this classifica-
Using Oscillating Disk Cure Meter
tion system are listed in Table 1 together with some of their
D 2414 Test Method for Carbon Black—Oil Absorption
typical properties. ASTM classification numbers (“N” or “S”
Number (OAN)
designation) not listed in Table 1 have either been withdrawn
D 3053 Terminology Relating to Carbon Black
or are not currently assigned.The use of inactive or unassigned
D 3182 Practice for Rubber—Materials, Equipment, and
N or S designations is prohibited until such a time as the
Procedures for Mixing Standard Compounds and Prepar-
designation is officially reactivated or assigned by Subcommit-
ing Standard Vulcanized Sheets
tee D24.41
D 3192 Test Methods for Carbon Black Evaluation in NR
1.3 The values stated in SI units are to be regarded as the
(Natural Rubber)
standard. The values given in parentheses are for information
D 3265 Test Method for Carbon Black—Tint Strength
only.
D 3493 Test Method for Carbon Black—Oil Absorption
1.4 This standard does not purport to address all of the
Number of Compressed Sample (COAN)
safety concerns, if any, associated with its use. It is the
D 4122 PracticeforCarbonBlack—EvaluationofanIndus-
responsibility of the user of this standard to establish appro-
try Reference Black
priate safety and health practices and determine the applica-
D 6556 Test Method for Carbon Black—Total and External
bility of regulatory limitations prior to use.
Surface Area by Nitrogen Adsorption
2. Referenced Documents
3. Basis of Classification
2
2.1 ASTM Standards:
3.1 The first character in the nomenclature system for
rubber-grade carbon blacks is a letter indicating the effect of
the carbon black on the cure rate of a typical rubber compound
1
ThisclassificationsystemisunderthejurisdictionofASTMCommitteeD24on
containingtheblack.Theletter“N”isusedtoindicateanormal
Carbon Black and is the direct responsibility of Subcommittee D24.41 on Carbon
curing rate typical of furnace blacks that have received no
Black Nomenclature and Terminology.
special modification to alter their influence on the rate of cure
Current edition approved Oct. 1, 2005. Published October 2005. Originally
approved in 1965. Last previous edition approved in 2005 as D 1765–05.
of rubber. The letter “S” is used for channel blacks or for
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
furnace blacks that have been modified to effectively reduce
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
the curing rate of rubber. Channel blacks characteristically
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. impart a slower rate of cure to rubber compounds. Thus, the
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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.
D 1765 – 05a
TABLE 1 Carbon Black Properties
NOTE 1—The iodine adsorption number and DBP number values represent target values. A target value is defined as an agreed upon value on which
producers center their production process and users center their specifications. All other properties shown are averages of typical values supplied b
...