ASTM D3674-89(1993)e1

Test Method for Carbon Black Relative Extrucion Mass (Withdrawn 1999)

SCOPE
1.1 This test method covers the determination of the relative extrusion mass of a carbon black sample compounded in a styrene-butadiene rubber (SBR) compound recipe. A sample of the current industry reference black (IRB) and the sample to be tested are both compounded and extruded in the same manner in accordance with Test Methods D3191. The mass of a 1-m (39.37-in.) length extrusion of each sample is measured, and the relative extrusion mass of the tested sample is expressed as a percent of the mass of the extrusion containing IRB.  
1.2 The values stated in SI units are to be regarded as the standard. The values in parentheses are for information only.  
1.3 This standard does not purport to address all of the safety problems, 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• Status: Withdrawn
• Publication Date: 31-Dec-1992
• Withdrawal Date: 09-May-1999
• ICS: 83.040.20 - Rubber compounding ingredients
• Technical Committee: D24 - Carbon Black
• Drafting Committee: D24.71 - Carbon Black Testing in Rubber

Standards Content (Sample)

ASTM D3674 89 - 0759510 0533730 748 =
AMERICAN SOCIETY FOR TESTING AND MATERIALS
Designation: D 3674 - 89 (Reapproved 1993)t1 1916 Race St. Philadelphia, Pa 19103
Reprinted Irom the Annual Book of ASTM Standards. CopyrIght ASTM
If not lIsted in the current combined index. will appear in the next edition
Standard Test Method for
Carbon Black-Relative Extrusion Mass’
This standard is issued under the fixed designation D 3674; 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 (t) indicates an editorial change since the last revision or reapproval.
(I NOTE-Keywords were added editorially in December 1993.
1. Scope 4. Apparatus
1.1 This test method covers the determination of the rela- 4.1 Mixing Mill, as described in Practice D 3 182.
tive extrusion mass of a carbon black sample compounded in 4.2 Extruder, screw-type, having a compression ratio of
a styrene-butadiene rubber (SBR) compound recipe. A sam- 1: 1, with cylindrical extrusion die as shown in Fig. 1. The
ple of the current industry reference black (IRB) and the distance between the end of the screw and the land of the die
sample to be tested are both compounded and extruded in shall be from 1 to 2 times the diameter of the screw, and the
the same manner in accordance with Test Methods D 3 I9 1. ratio of the length to diameter of the screw shall be 5:l or
The mass of a l-m (39.37~in.) length extrusion of each sample greater. The use of breaker plates, screens, or spiders in the
is measured, and the relative extrusion mass of the tested
extruder is not recommended.
sample is expressed as a percent of the mass of the extrusion 4.2.1 The extruder shah be equipped with devices capable
containing IRB. of monitoring the temperature of the barrel, the head, the
1.2 The values stated in SI units are to be regarded as the discharged heating fluid from the screw, and the surface of
standard. The values in parentheses are for information only. the die. These monitoring devices shall have a sensitivity of
1.3 This standard does not purport to address ail of the 0S”C or less.
safety problems, if any, associated with its use. It is the
4.3 Scale or Balance, 500-g capacity, 0.01-g sensitivity.
responsibility of the user of this standard to establish appro-
4.4 Oven, gravity-convection type, capable of temperature
priate safety and health practices and determine the applica-
regulation within + 1’C at 125’C and temperature uniformity
bility of regulatory limitations prior to use.
within +5’C.
4.5 Metal Cooling Table, approximately 0.8 m (30 in.)
2. Referenced Documents
wide by 1.2 m (48 in.) long, with a smooth, flat surface lightly
dusted with zinc stearate or talc powder.
2.1 ASTM Standards:
4.6 Metre Stick or Jig, for measuring or cutting uniform
D 1799 Practice for Carbon Black-Sampling Packaged
I-m (39.37-m.) lengths, or both.
Shipments2
4.7 Belt Conveyor, motor driven with a belt at least 150
D 1900 Practice for Carbon Black-Sampling Bulk
mm (6 in.) wide and 1.5 m (5 ft) long, and variable in speed
Shipment2
up to 75 mm/s (15 ft/min).
D3051 Practice for Carbon Black-Stating the Precision
of ASTM Test Methods2 NOTE 1 -It is not mandatory to use a belt conveyor to obtain reliable
test data.
D 3 182 Practice for Rubber-Materials, Equipment, and
Procedures for Mixing Standard Compounds and Pre-
5. Materials and Manufacture
paring Standard Vulcanized Sheets2
5.1 The materials as described in Test Methods D 3 19 1
D 3 19 1 Test Methods for Carbon Black Evaluation in SBR
shall be used.
(Styrene-Butadiene Rubber)2
5.2 The current lot of industry reference black shall be
D 3396 Practice for Carbon Black-Measuring the Preci-
used in the standard compound.
sion of ASTM Test Methods2
6. Sampling
3. Significance and Use
6.1 Take samples in accordance with Practices D 1799 and
3.1 In practice, rubber compounds swell as they leave
D 1900.
extrusion dies. For compounds differing only in the type of
carbon black, the amount of swelling is influenced by the
7. Procedure
morphological characteristics of the carbon black. This test
7.1 Prepare and mix the IRB and all carbon black samples
method permits a comparison of various samples of carbon
in accordance with Practice D 3 182 and Test Methods
black for these morphological characteristics.
D 3191.
7.1.1 Cut the stock from the main batch into strips ap
r This test method is under the jurisdiction of ASTM Committee D24 on proximately as wide as the extruder feed hopper in accordance
Carbon Black and is the direct responsibility of Subcommittee D24.7 I on Methods
with Test Methods D 3 19 1. Cut enough stock to produce an
of Testing Carbon Black in Rubber.
extrusion approximately 4.5 m ( 15 ft) long, while maintaining
Cumnt ed.ition approved Oct. -27, 1989. Published December 1989. Originally
a full extruder.
published as D 3674 - 78. Last previous edition D 3674 - 88.
2 Annual Book of ASTM Standards, Vol 09.0 I.
7.2 Condition the stock for a minimum of 1 h and a
ASTM D3b74 B9 - 0759510 0533733 b84 m
4X
ASTM EXTRUSION DIE
CYLINDRICAL TYPE
SECTION ” X X”
Dimension, mm (ii.) Tolemnce, mm (in.) Dlmwlsbn, o Tolerancs.
. . . . . .
5.00 (0.1966) 0.01 (O.ooo5)
5.00 (0.1968) 0.01 (O.ooo5) . . . . . .
. . . . . . 30
FIG. 1 Diagram Showing Stock Flow from End of Screw to Extrurlon Die
maximum of 16 h at 23 f 3°C and 50 + 5 % relative screw will take it. Remove the extrusion from the die by
humidity before beginning extrusion. In any given series, all means of the take-away conveyor. It is important that the
mixed stocks are to be extruded within a 2-h period. strips from this first extrusion be kept in order so they may
7.2.1 Condition the stock in a closed container if the be fed back into the extruder on the second extrusion in a
relative humidity control described in 7.2 is not possible. first out-first in order.
7.3 For laboratory extruders with internal barrel diameters 7.9 Set the conveyor belt speed so the extrusion forms a
greater than 20 mm (0.8 in.), heat the extruder head, barrel, uniform, sinusoidal-type configuration about 90 mm (3.5
screw, and die to 70 f 3°C and hold for 10 min before in
...