ASTM D3926-05

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

• Status: Historical
• Publication Date: 30-Jun-2005
• ICS: 87.060.10 - Pigments and extenders
• Technical Committee: D01 - Paint and Related Coatings, Materials, and Applications
• Drafting Committee: D01.31 - Pigment Specifications

Relations

• Replaces: ASTM D3926-80(1999) - Standard Test Method for Percent Solids in Titanium Dioxide Slurries
• Effective Date: 01-Jul-2005
• Replaced By: ASTM D3926-05(2011) - Standard Test Methods for Percent Solids in Titanium Dioxide Slurries
• Effective Date: 01-Jun-2011

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NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.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
Standard Test Methods for
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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
1.2 The values stated in SI units are to be regarded as oxide treatments on the more highly treated titanium dioxide
standard. No other units of measurement are included in this pigments may change somewhat with prolonged drying, in the
standard. oven method the solids of the slurry are considered dry after
1.3 This test standard does not purport to address all of the heating at 105°C for 60 to 65 min. The high temperature
safety concerns, if any, associated with its use. It is the associated with the infrared moisture analyzer may also effect
responsibility of the user of this standard to establish appro- a change in the aluminum and silica oxide treatment on highly
priate safety and health practices and determine the applica- treated TiO products. Therefore, care in selection of time and
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bility of regulatory limitations prior to use. temperature are critical to obtain accurate results with the
infrared method.With the short duration of test associated with
2. Referenced Documents
the microwave drying system, overdrying is not a concern.
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2.1 ASTM Standards:
5. Apparatus
D1193 Specification for Reagent Water
5.1 Oven Method:
3. Summary of Test Method
5.1.1 Oven—Laboratory oven capable of maintaining a
3.1 Oven Method: temperature of 105 6 2°C (Note 1). The oven may be a
3.1.1 Slurry is weighed by difference into a tared aluminum gravity-convection type or an oven with a low velocity, forced
foil dish, dried at 105°C in an oven for 1 h, cooled in a
draft. An oven with a high-velocity, forced-draft air change,
desiccator, and weighed. commonly used for baking finishes, is not suitable.
3.2 Infrared Method:
NOTE 1—The temperature in the oven must be constantly monitored.
3.2.1 Slurry is dried under infrared lamps for a specified
Many older ovens will no longer maintain 6 2°C; some will maintain this
time and temperature. The results are obtained directly form
tolerance for a while but occasionally the thermostat will “stick” and the
the unit’s display panel.
temperature will vary considerably.
3.3 Microwave Method:
5.1.2 Balance—Laboratory analytical balance, accurate to
3.3.1 2 to4gof slurry is placed between two glass fiber
0.1 mg, with 1-g optical readout range for fast weighing.
pads and dried in a microwave drying system. The results are
NOTE 2—Periodically check the accuracy of the 1-g optical scale of the
obtained directly form the unit’s display panel.
balance by use of a known 1-g weight; adjust the balance if needed. The
zeroadjustmentoftheopticalscaleneedstobecheckedatleasteveryhour
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routinely and immediately if there is any possibility of a spill having
These test methods are under the jurisdiction of ASTM Committee D01 on
Paint and Related Coatings, Materials, and Applications and are the direct occurred on the balance.
responsibility of Subcommittee D01.31 on Pigment Specifications.
5.1.3 Desiccator—Standard laboratory desiccator utilizing
Current edition approved July 1, 2005. Published July 2005. Originally approved
an indicating drying medium.
in 1980. last previous edition approved in 1999 as D3926 – 80 (1999). DOI:
10.1520/D3926-05.
5.2 Infrared Method:
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
5.2.1 Infrared Moisture Analyzer—Automated moisture
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
analyzer combining infrared drying technology and a precision
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. analytical balance in a single unit.
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D3926–05
5.3 Microwave Method: an equilibrium moisture exchange between
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