ASTM D1765-06

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: D1765 – 06
Standard Classification System for
1
Carbon Blacks Used in Rubber Products
This standard is issued under the fixed designation D1765; 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.
This standard has been approved for use by agencies of the Department of Defense.
1. Scope D2414 Test Method for Carbon Black—Oil Absorption
Number (OAN)
1.1 This classification system covers the classification of
D3053 Terminology Relating to Carbon Black
rubber-grade carbon blacks by the use of a four-character
D3265 Test Method for Carbon Black—Tint Strength
nomenclature system.The first character gives some indication
D3493 Test Method for Carbon Black—Oil Absorption
of the influence of the carbon black on the rate of cure of a
Number of Compressed Sample (COAN)
typical rubber compound containing the black. The second
D6556 Test Method for Carbon Black—Total and External
character gives information on the average surface area of the
Surface Area by Nitrogen Adsorption
carbon black. The last two characters are assigned arbitrarily.
1.2 All rubber-grade carbon blacks for which a number is
3. Basis of Classification
currently assigned at the time of publication of this classifica-
3.1 The first character in the nomenclature system for
tion system are listed in Table 1 together with some of their
rubber-grade carbon blacks is a letter indicating the effect of
typical properties. ASTM classification numbers (“N” or “S”
the carbon black on the cure rate of a typical rubber compound
designation) not listed in Table 1 have either been withdrawn
containingtheblack.Theletter“N”isusedtoindicateanormal
or are not currently assigned.The use of inactive or unassigned
curing rate typical of furnace blacks that have received no
N or S designations is prohibited until such a time as the
special modification to alter their influence on the rate of cure
designation is officially reactivated or assigned by Subcommit-
of rubber. The letter “S” is used for channel blacks or for
tee D24.41
furnace blacks that have been modified to effectively reduce
1.3
the curing rate of rubber. Channel blacks characteristically
1.4 This standard does not purport to address all of the
impart a slower rate of cure to rubber compounds. Thus, the
safety concerns, if any, associated with its use. It is the
letter “S” designates a slow cure rate. Blacks may vary
responsibility of the user of this standard to establish appro-
considerably in “curing rate” within each of the two letter
priate safety and health practices and determine the applica-
classifications.
bility of regulatory limitations prior to use.
3.2 Thesecondcharacterinthesystemisadigittodesignate
2. Referenced Documents the average surface area of the carbon black as measured by
2 nitrogen surface area. The surface area range of the carbon
2.1 ASTM Standards:
blacks has been divided into ten arbitrary groups, and each has
D1508 Test Method for Carbon Black, Pelleted Fines and
been assigned a digit to describe that group. These groups are
Attrition
as follows:
D1510 Test Method for Carbon Black—Iodine Adsorption
Average Nitrogen
Number
Group No.
2
Surface Area, m /g
D1513 Test Method for Carbon Black, Pelleted—Pour Den-
0 >150
sity
1 121 to 150
2 100 to 120
D1514 Test Method for Carbon Black—Sieve Residue
3 70to99
4 50to69
5 40to49
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ThisclassificationsystemisunderthejurisdictionofASTMCommitteeD24on
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 Aug. 1, 2006. Published August 2006. Originally
90to10
´1
approved in 1965. Last previous edition approved in 2005 as D1765 – 05a . DOI:
NOTE 1—Some of the carbon blacks in Table 1 were assigned prior to
10.1520/D1765-06.
2
the establishment of the surface area classification system and may fall
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D1765 – 06
TABLE 1 Carbon Black Properties
NOTE—The iodine adsorption number and oil absorption 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
...