ASTM E1358-97(2006)

NOTICE: This standard has either been superseded and replaced by a new version or withdrawn.
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Designation: E1358 − 97(Reapproved 2006)
Standard Test Method for
Determination of Moisture Content of Particulate Wood
Fuels Using a Microwave Oven
This standard is issued under the fixed designation E1358; 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 moisture delivered by truck where a quick indication of the
moisture of wood delivered is desirable.
1.1 This test method provides an alternative method to
Method E871, for the determination of the moisture of particu-
5. Apparatus
late wood fuels. Particulate wood fuels are defined in E1126.
5.1 Microwave Oven—Any standard commercial micro-
1.2 This standard does not purport to address all of the
wave oven having a power output of at least 600 W can be
safety concerns, if any, associated with its use. It is the
used.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
6. Procedure
bility of regulatory limitations prior to use.
6.1 Obtain a 50 g sample of the wood to be tested using
2. Referenced Documents
techniques outlined in Method E871.
2.1 ASTM Standards:
6.2 Determine the weight of 3 sheets of standard paper
E871 Test Method for Moisture Analysis of Particulate
towels placed on top of each other. Record this mass as M
T
Wood Fuels
(Mass of Towels).
E1126 Terminology Relating to Biomass Fuels (Withdrawn
2003)
6.3 Place the 50-g sample of the wood on top of the paper
towels and determine the mass of the initial sample. Record the
3. Summary of Test Method
mass as M (Mass of Sample and Towels Initial).
STI
3.1 Moisture is determined by establishing the loss in mass
6.4 Place the sample in the microwave and heat on full
of the sample when heated under rigidly controlled conditions
power using the schedule shown in Table 1 for the type of
of temperature, time, sample mass, and equipment specifica-
wood fuel being tested. Remove sample and towels from oven
tions.
after each heating interval, weigh, and stir. When the mass
change between successive weighings is less than 0.5 g, record
4. Significance and Use
this mass as M (Mass of Sample and Towels Final).
STF
4.1 This test method provides a rapid determination for
moisture in particulate wood fuels in several minutes. The
7. Calculation
standard method, E871, requires a minimum of 18 h. This
7.1 Calculate the mass percent moisture in the sample as
method is applicable to situations such as the spot-check of the
follows:
Moisture in Sample, %
This test method is under the jurisdiction of ASTM Committee E48 on
5 M 2 M 2 M 2 M / M 2 M
~~ ! ~ !! ~ !
STI T STF T STI T
Biotechnology and is the direct responsibility of Subcommittee E48.05 on Biomass
Conversion.
8. Precision and Bias
Current edition approved Feb. 1, 2006. Published February 2006. Origi
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