ASTM D1765-01

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 Table 1 together with some of their typical properties.  
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: 09-Jan-2001
• Technical Committee: D24 - Carbon Black
• Drafting Committee: D24.41 - Carbon Black Nomenclature and Terminology

Relations

• Replaced By: ASTM D1765-01e1 - Standard Classification System for Carbon Blacks Used in Rubber Products
• Effective Date: 10-Jan-2001

Standards Content (Sample)

ASTM-D1765
ADOPTION NOTICE
ASTM-D1765, "CARBON BLACKS USED IN RUBBER PRODUCTS", was adopted
on 03-OCT-94 for use by the Department of Defense (DoD).
Proposed changes by DoD activities must be submitted to the DoD
Adopting Activity: Commander, US Army Tank-Automotive and
Armaments Command, ATTN: AMSTA-TR-E/IE, Warren, MI 48397-5000.
Copies of this document may be purchased from the American
Society for Testing and Materials 100 Barr Harbor Drive West
Conshohocken, Pennsylvania, United States, 19428-2959.
http://www.astm.org/____________________
Custodians: Adopting Activity:
Army - AT Army - AT
Navy - SH
Air Force - 68
FSC 6810
Approved for public release; distribution
DISTRIBUTION STATEMENT A:
is unlimited.

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Designation: D 1765 – 01
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 3182 Practice for Rubber—Materials, Equipment, and
Procedures for Mixing Standard Compounds and Prepar-
1.1 This classification system is used to classify rubber
2
ing Standard Vulcanized Sheets
grade carbon blacks by the use of a four-character nomencla-
D 3191 Test Methods for Carbon Black in SBR (Styrene-
ture system. The first character gives some indication of the
2
Butadiene Rubber)—Recipe and Evaluation Procedures
influence of the carbon black on the rate of cure of a typical
D 3192 Test Methods for Carbon Black Evaluation in NR
rubber compound containing the black. The second character
2
(Natural Rubber)
gives information on the average surface area of the carbon
2
D 3265 Test Method for Carbon Black—Tint Strength
black. The last two characters are assigned arbitrarily.
D 3493 Test Method for Carbon Black—Oil Absorption
1.2 All rubber-grade carbon blacks for which a number is
2
Number of Compressed Sample
currently assigned at the time of publication of this classifica-
D 6556 Test Method for Carbon Black—Total and External
tion system are listed in Table 1 together with some of their
2
Surface Area by Nitrogen Adsorption
typical properties.
1.3 The values stated in SI units are to be regarded as the
3. Basis of Classification
standard. The values given in parentheses are for information
3.1 The first character in the nomenclature system for
only.
rubber-grade carbon blacks is a letter indicating the effect of
1.4 This standard does not purport to address all of the
the carbon black on the cure rate of a typical rubber compound
safety concerns, if any, associated with its use. It is the
containing the black. The letter “N” is used to indicate a normal
responsibility of the user of this standard to establish appro-
curing rate typical of furnace blacks that have received no
priate safety and health practices and determine the applica-
special modification to alter their influence on the rate of cure
bility of regulatory limitations prior to use.
of rubber. The letter “S” is used for channel blacks or for
2. Referenced Documents furnace blacks that have been modified to effectively reduce
the curing rate of rubber. Channel blacks characteristically
2.1 ASTM Standards:
impart a slower rate of cure to rubber compounds. Thus, the
D 412 Test Methods for Vulcanized Rubber and Thermo-
2
letter “S” designates a slow cure rate. Blacks may vary
plastic Rubbers and Thermoplastic Elastomers—Tension
considerably in “curing rate” within each of the two letter
D 1508 Test Method for Carbon Black, Pelleted Fines and
2 classifications.
Attrition
3.2 The second character in the system is a digit to designate
D 1510 Test Method for Carbon Black—Iodine Adsorption
2 the average surface area of the carbon black as measured by
Number
nitrogen surface area. The surface area range of the carbon
D 1513 Test Method for Carbon Black, Pelleted—Pour
2 blacks has been divided into ten arbitrary groups, and each has
Density
2
been assigned a digit to describe that group. These groups are
D 1514 Test Method for Carbon Black—Sieve Residue
as follows:
D 2084 Test Method for Rubber Property—Vulcanization
2
Average Nitrogen
Using Oscillating Disk Cure Meter
Group No.
2
Surface Area, m /g
D 2414 Test Method for Carbon Black—Oil Absorption
0 > 150
2
Number 1 121 to 150
2
2 100 to 120
D 3053 Terminology Relating to Carbon Black
3 70to99
4 50to69
5 40to49
1
This classification is under the jurisdiction of ASTM Committee D24 on
6 33to39
Carbon Black and is the direct responsibility of Subcommittee D24.41 on Carbon
7 21to32
Black Nomenclature and Terminology.
8 11to20
Current edition approved Jan. 10, 2001. Published March 2001. Originally
9 0
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