ASTM D168-94(2000)
(Test Method)Standard Test Method for Coke Residue of Creosote (Withdrawn 2006)
Standard Test Method for Coke Residue of Creosote (Withdrawn 2006)
SCOPE
1.1 This test method covers the determination of the coke residue (fixed carbon) of creosote, coal tar, and creosote-coal tar solutions. As coal tars vary in their coke residue values, the method is therefore not a quantitative index of the percentage of coal tar in creosote-coal tar solutions. However, by specifying maximum amounts of coke residue as done in AWPA Standards P2 and P12, the method does serve to limit the amount of coal tar in such solutions; and by specifying a minimum as in Standard P12 it ensures the presence of some coal tar. Formerly the test was also used as a check on the cleanliness of AWPA P1 creosote (absence of coal tar).
1.1.1 Test Method D38 covers the sampling of wood preservatives prior to testing.
1.2 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. See Section 6 for specific precautionary statements.
WITHDRAWN RATIONALE
This test method covers the determination of the coke residue (fixed carbon) of creosote, coal tar, and creosote-coal tar solutions. As coal tars vary in their coke residue values, the method is therefore not a quantitative index of the percentage of coal tar in creosote-coal tar solutions.
Formerly under the jurisdiction of Committee D07 on Wood, this test method was withdrawn with no replacement in July 2006.
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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American Association State
Designation:D168–94 (Reapproved 2000) Highway Transportation Standard
AASHTO No. 61
Standard Test Method for
Coke Residue of Creosote
This standard is issued under the fixed designation D 168; 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.
1. Scope P 12 Creosote–Coal Tar Solution for Treating of Marine
(Coastal Waters), Piles, and Timbers
1.1 This test method covers the determination of the coke
residue (fixed carbon) of creosote, coal tar, and creosote-coal
3. Summary of Test Method
tar solutions.As coal tars vary in their coke residue values, the
3.1 After subjecting the creosote-coal tar solution (oil)
method is therefore not a quantitative index of the percentage
under test to the distillation method (Standard A1, Section 2),
of coal tar in creosote-coal tar solutions. However, by speci-
the weighed residue at 355°C in the distillation flask is
fying maximum amounts of coke residue as done in AWPA
thoroughly mixed and a one-gram sample transferred to a
Standards P 2 and P 12, the method does serve to limit the
special platinum crucible with vented cover. The crucible is
amount of coal tar in such solutions; and by specifying a
then placed in a furnace maintained at 950 6 20°C for exactly
minimum as in Standard P 12 it ensures the presence of some
7 min. A final weighing gives the amount of coke of the
coal tar. Formerly the test was also used as a check on the
distillation residue. The coke residue of the creosote-coal tar
cleanliness of AWPA P1 creosote (absence of coal tar).
solution under test is calculated from (a) the percentage of
1.1.1 Test Methods D 38 covers the sampling of wood
distillation residue at 355°C, (b) the weight of the sample of
preservatives prior to testing.
distillation residue transferred to the platinum crucible, and (c)
1.2 This standard does not purport to address all of the
the weight of coke remaining in the platinum crucible after the
safety concerns, if any, associated with its use. It is the
coking operation.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Significance and Use
bility of regulatory limitations prior to use. See Section 6 for
4.1 This test method is useful as an indicator of the
specific precautionary statements.
preparation of coal tar in solution with coal tar distillate. The
2. Referenced Documents test method can also be used as one element in establishing
uniformity of shipments and sources of supply.
2.1 ASTM Standards:
D 38 Test Methods for Sampling Wood Preservatives Prior
5. Apparatus
to Testing
5.1 Crucible and Cover—Platinum crucible and cover with
D 246 Test Method for Distillation of Creosote and
2 dimensions as shown in Fig. 1. The cover shall be tightly
Creosote-Coal Tar Solutions
fitting, shall have a depth of between 10.0 and 10.2 mm, and
2.2 AWPA Standards:
3 shall have a hole 2.0 mm in diameter at its center. The crucible
P 2 Creosote–Coal Tar Solution
without cover shall have a capacity of 25 to 30 mL. It shall
haveanoutsidediameteratthetopof34to35mm,andoutside
diameter at the bottom of 19 to 21 mm, and a height of 40 to
This test method is under the jurisdiction of ASTM Committee D-7 on Wood
and is the direct responsibility of Subcommittee D07.06 on Treatments for Wood
45 mm. The weight of crucible with cover shall be 25 to 35 g.
Products.
5.2 Crucible Holder—The crucible holder shall be made
This test method is identical in substance with the Standard Method for the
from No. 20 Nichrome wire and a brass ring as shown in Fig.
Determination of Coke Residue which is part of the American Wood-Preservers’
Association Standard Methods forAnalysis of Creosote and Oil-Type Preservatives 2. The holder serves as a support for the platinum crucible
(A1-78). Acknowledgment is made to the American Wood-Preservers’ Association
during the coking operation.
for its development of the subject matter covered in this standard.
Current edition approved July 15, 1994. Published September 1994. Originally
published as D 168 – 23 T. Last previous edition D 168 – 86.
Annual Book of ASTM Standards, Vol 04.10.
Available from the American Wood-Preservers’ Assn., P.O. Box 286, Wood-
stock, MD 21163-0286.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
D168
5.3 Furnace—A vertical electric tube furnace having a
heating chamber 1 ⁄2 in. (38 mm) in diameter, by 6 in. (150
mm) in depth. The power input shall be 300 to 400 W at 115
V. The furnace shall be equipped with a suitable rheostat or
variable transformer and pyrometer, for control at 950 6 20°C.
Athermocouple shall be installed through a central hole in the
bottom of the furnace, and sealed in place so that its junction
is located 2 to 5 mm below the eventual position of the bottom
of the platinum crucible.
5.4 Gas Burner—Agas burner of the bunsen or Meker type.
NOTE 1—In case of dispute, the tube furnace method shall be consid-
ered the standard method.
6. Precautions
6.1 Conduct the test in a part of the laboratory free of drafts.
6.2 It is important that the tip of the inner cone of a bunsen
burner flame shall be below the bottom of the crucible. The
burner should, therefore, be adjusted so that the inner cone is
60 to 70 mm in height. The bottom of the crucible shall be 5 to
10 mm above the tip of the inner cone.
FIG. 1 Platinum Crucible
7. Procedure
7.1 Heatandadjustthetemperatureoftheuncovered,empty
furnace to 950 6 20°C. Clean the platinum cruc
...
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