ASTM D3926-05(2011)
(Test Method)Standard Test Methods for Percent Solids in Titanium Dioxide Slurries
Standard Test Methods for Percent Solids in Titanium Dioxide Slurries
SIGNIFICANCE AND USE
These test methods are intended as a quick and reliable procedure for measuring the titanium dioxide pigment content of aqueous slurries. Included with the pigment content in the percent solids are the various nonvolatile additives used in preparing a stable slurry. Because the aluminum and silica oxide treatments on the more highly treated titanium dioxide pigments may change somewhat with prolonged drying, in the oven method the solids of the slurry are considered dry after heating at 105°C for 60 to 65 min. The high temperature associated with the infrared moisture analyzer may also effect a change in the aluminum and silica oxide treatment on highly treated TiO2 products. Therefore, care in selection of time and temperature are critical to obtain accurate results with the infrared method. With the short duration of test associated with the microwave drying system, overdrying is not a concern.
SCOPE
1.1 These test methods cover the determination of the weight percent of solids in aqueous slurries of titanium dioxide pigments by either the use of a gravity-convection oven (Method A), infrared radiation moisture analyzer (Method B), or a microwave drying system (Method C).
1.2 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.3 This test 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
Relations
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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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: D3926 − 05 (Reapproved 2011)
Standard Test Methods for
1
Percent Solids in Titanium Dioxide Slurries
This standard is issued under the fixed designation D3926; 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.
1. Scope 4. Significance and Use
1.1 These test methods cover the determination of the 4.1 These test methods are intended as a quick and reliable
weight percent of solids in aqueous slurries of titanium dioxide
procedure for measuring the titanium dioxide pigment content
pigments by either the use of a gravity-convection oven
of aqueous slurries. Included with the pigment content in the
(Method A), infrared radiation moisture analyzer (Method B),
percent solids are the various nonvolatile additives used in
or a microwave drying system (Method C).
preparing a stable slurry. Because the aluminum and silica
oxide treatments on the more highly treated titanium dioxide
1.2 The values stated in SI units are to be regarded as
pigments may change somewhat with prolonged drying, in the
standard. No other units of measurement are included in this
oven method the solids of the slurry are considered dry after
standard.
heating at 105°C for 60 to 65 min. The high temperature
1.3 This test standard does not purport to address all of the
associated with the infrared moisture analyzer may also effect
safety concerns, if any, associated with its use. It is the
a change in the aluminum and silica oxide treatment on highly
responsibility of the user of this standard to establish appro-
treated TiO products. Therefore, care in selection of time and
2
priate safety and health practices and determine the applica-
temperature are critical to obtain accurate results with the
bility of regulatory limitations prior to use.
infrared method.With the short duration of test associated with
the microwave drying system, overdrying is not a concern.
2. Referenced Documents
2
2.1 ASTM Standards:
5. Apparatus
D1193 Specification for Reagent Water
5.1 Oven Method:
5.1.1 Oven—Laboratory oven capable of maintaining a
3. Summary of Test Method
temperature of 105 6 2°C (Note 1). The oven may be a
3.1 Oven Method:
gravity-convection type or an oven with a low velocity, forced
3.1.1 Slurry is weighed by difference into a tared aluminum
draft. An oven with a high-velocity, forced-draft air change,
foil dish, dried at 105°C in an oven for 1 h, cooled in a
commonly used for baking finishes, is not suitable.
desiccator, and weighed.
NOTE 1—The temperature in the oven must be constantly monitored.
3.2 Infrared Method:
Many older ovens will no longer maintain 62°C; some will maintain this
3.2.1 Slurry is dried under infrared lamps for a specified
tolerance for a while but occasionally the thermostat will “stick” and the
time and temperature. The results are obtained directly form
temperature will vary considerably.
the unit’s display panel.
5.1.2 Balance—Laboratory analytical balance, accurate to
3.3 Microwave Method: 0.1 mg, with 1-g optical readout range for fast weighing.
3.3.1 2 to4gof slurry is placed between two glass fiber
NOTE 2—Periodically check the accuracy of the 1-g optical scale of the
pads and dried in a microwave drying system. The results are
balance by use of a known 1-g weight; adjust the balance if needed. The
obtained directly form the unit’s display panel.
zeroadjustmentoftheopticalscaleneedstobecheckedatleasteveryhour
routinely and immediately if there is any possibility of a spill having
occurred on the balance.
1
These test methods are under the jurisdiction of ASTM Committee D01 on
5.1.3 Desiccator—Standard laboratory desiccator utilizing
Paint and Related Coatings, Materials, and Applications and are the direct
an indicating drying medium.
responsibility of Subcommittee D01.31 on Pigment Specifications.
Current edition approved June 1, 2011. Published June 2011. Originally
5.2 Infrared Method:
approved in 1980. last previous edition approved in 2005 as D3926 – 05. DOI:
5.2.1 Infrared Moisture Analyzer—Automated moisture
10.1520/D3926-05R11.
2
analyzer combining infrared drying technology and a precision
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
analytical balance in a single unit.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. 5.3 Microwave Method:
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1
---------------------- Page: 1 ----------------------
D3926 − 05 (2011)
5.3.1 Microwave
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.