ASTM D1765-04

Standard Classification System for Carbon Blacks Used in Rubber Products

SCOPE
1.1 This classification system is used to classify 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 ASTM classification numbers ("N" or "S" designation) not listed in have either been withdrawn or are not currently assigned.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# designations is highly discouraged until such a time as the designation is officially reactivated or assigned by subcommittee D 24.41
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: 31-Dec-2003
• ICS: 83.040.20 - Rubber compounding ingredients
• Technical Committee: D24 - Carbon Black
• Drafting Committee: D24.41 - Carbon Black Nomenclature and Terminology

Relations

• Replaces: ASTM D1765-03 - Standard Classification System for Carbon Blacks Used in Rubber Products
• Effective Date: 01-Jan-2004
• Replaced By: ASTM D1765-04e1 - Standard Classification System for Carbon Blacks Used in Rubber Products
• Effective Date: 01-Jan-2004
• Referred By: ASTM E1136-19 - Standard Specification for P195/75R14 Radial Standard Reference Test Tire
• Effective Date: 01-Jan-2004
• Referred By: ASTM D5817-20 - Standard Practice for Carbon Black, Pelleted—Reduction, Blending, and Drying of Gross Samples for Testing
• Effective Date: 01-Jan-2004
• Referred By: ASTM D4583-21 - Standard Practice for Carbon Black—Calculation of Process Indexes From an Analysis of Process Control Data
• Effective Date: 01-Jan-2004
• Referred By: ASTM D3053-23 - Standard Terminology Relating to Carbon Black
• Effective Date: 01-Jan-2004
• Referred By: ASTM D3493-21 - Standard Test Method for Carbon Black—Oil Absorption Number of Compressed Sample (COAN)
• Effective Date: 01-Jan-2004
• Referred By: ASTM D4821-20 - Standard Guide for Carbon Black—Validation of Test Method Precision and Bias
• Effective Date: 01-Jan-2004
• Referred By: ASTM D2414-23 - Standard Test Method for Carbon Black—Oil Absorption Number (OAN)
• Effective Date: 01-Jan-2004

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 – 04 DO NOT USE THIS VERSION
Standard Classification System for
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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
e NOTE—DO NOT USE THIS VERSION—INCORRECTLY PUBLISHED WITH NEGATIVE BALLOT ITEMS. RE-
PLACED BY D 1765 - 04E01, WHICH WAS IMMEDIATELY FOLLOWED BY D 1765 - 04a.
1. Scope D 1508 Test Method for Carbon Black, Pelleted Fines and
Attrition
1.1 DO NOT USE THIS VERSION; SEE EDIT NOTE
D 1510 Test Method for Carbon Black—Iodine Adsorption
ABOVE. This classification system is used to classify rubber
Number
grade carbon blacks by the use of a four-character nomencla-
D 1513 Test Method for Carbon Black, Pelleted—Pour
ture system. The first character gives some indication of the
Density
influence of the carbon black on the rate of cure of a typical
D 1514 Test Method for Carbon Black—Sieve Residue
rubber compound containing the black. The second character
D 2084 Test Method for Rubber Property—Vulcanization
gives information on the average surface area of the carbon
Using Oscillating Disk Cure Meter
black. The last two characters are assigned arbitrarily.
D 2414 Test Method for Carbon Black—Oil Absorption
1.2 All rubber-grade carbon blacks for which a number is
Number
currently assigned at the time of publication of this classifica-
D 3053 Terminology Relating to Carbon Black
tion system are listed in Table 1 together with some of their
D 3182 Practice for Rubber—Materials, Equipment, and
typical properties. ASTM classification numbers (“N” or “S”
Procedures for Mixing Standard Compounds and Prepar-
designation) not listed in Table 1 have either been withdrawn
ing Standard Vulcanized Sheets
or are not currently assigned.The use of inactive or unassigned
D 3191 Test Methods for Carbon Black in SBR (Styrene-
N# designations is highly discouraged until such a time as the
Butadiene Rubber)—Recipe and Evaluation Procedures
designation is officially reactivated or assigned by subcommit-
D 3192 Test Methods for Carbon Black Evaluation in NR
tee D 24.41
(Natural Rubber)
1.3 The values stated in SI units are to be regarded as the
D 3265 Test Method for Carbon Black—Tint Strength
standard. The values given in parentheses are for information
D 3493 Test Method for Carbon Black—Oil Absorption
only.
Number of Compressed Sample
1.4 This standard does not purport to address all of the
D 6556 Test Method for Carbon Black—Total and External
safety concerns, if any, associated with its use. It is the
Surface Area by Nitrogen Adsorption
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
3. Basis of Classification
bility of regulatory limitations prior to use.
3.1 The first character in the nomenclature system for
2. Referenced Documents rubber-grade carbon blacks is a letter indicating the effect of
2 the carbon black on the cure rate of a typical rubber compound
2.1 ASTM Standards:
containingtheblack.Theletter“N”isusedtoindicateanormal
D 412 Test Methods for Vulcanized Rubber and Thermo-
curing rate typical of furnace blacks that have received no
plastic Rubbers and Thermoplastic Elastomers—Tension
special modification to alter their influence on the rate of cure
of rubber. The letter “S” is used for channel blacks or for
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DONOTUSETHISVERSION;SEEEDITNOTEABOVE.Thisclassification
furnace blacks that have been modified to effectively reduce
isunderthejurisdictionofASTMCommitteeD24onCarbonBlackandisthedirect
the curing rate of rubber. Channel blacks characteristically
responsibility of Subcommittee D24.41 on Carbon Black Nomenclature and
impart a slower rate of cure to rubber compounds. Thus, the
Terminology.
letter “S” designates a slow cure rate. Blacks may vary
Current edition approved Jan. 1, 2004. Published February 2004. Originally
approved in 1965. Last previous edition approved in 2003 as D 1765 – 03.
considerably in “curing rate” within each of the two letter
2
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classifications.
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