ASTM E41-92(2004)

Terminology Relating to Conditioning

SCOPE
1.1 These definitions pertain to the conditioning of materials for test purposes. Unless otherwise specified, they are intended to apply to all cases where combinations of atmospheric influences are an essential part of the testing of materials.
1.2 It is the intent of this standard to include those conditioning terms in wide use in ASTM for which standard definitions appear desirable.

General Information

• Status: Historical
• Publication Date: 14-May-1992
• Technical Committee: G03 - Weathering and Durability
• Drafting Committee: G03.92 - Terminology

Relations

• Replaces: ASTM E41-92(2003) - Terminology Relating to Conditioning
• Effective Date: 15-May-1992
• Replaced By: ASTM E41-92(2010) - Terminology Relating to Conditioning (Withdrawn 2019)
• Effective Date: 01-Dec-2010
• Referred By: ASTM D5751-99(2019) - Standard Specification for Adhesives Used for Laminate Joints in Nonstructural Lumber Products
• Effective Date: 15-May-1992
• Referred By: ASTM D5572-95(2019) - Standard Specification for Adhesives Used for Finger Joints in Nonstructural Lumber Products
• Effective Date: 15-May-1992
• Referred By: ASTM D2063/D2063M-10(2018) - Standard Test Methods for Measurement of Torque Retention for Packages with Continuous Thread Closures Using Non-Automated (Manual) Torque Testing Equipment
• Effective Date: 15-May-1992
• Referred By: ASTM C870-11(2017) - Standard Practice for Conditioning of Thermal Insulating Materials
• Effective Date: 15-May-1992
• Referred By: ASTM G147-17 - Standard Practice for Conditioning and Handling of Nonmetallic Materials for Natural and Artificial Weathering Tests
• Effective Date: 15-May-1992
• Referred By: ASTM G151-19 - Standard Practice for Exposing Nonmetallic Materials in Accelerated Test Devices that Use Laboratory Light Sources
• Effective Date: 15-May-1992
• Referred By: ASTM D3924-16(2019) - Standard Specification for Standard Environment for Conditioning and Testing Paint, Varnish, Lacquer, and Related Materials
• Effective Date: 15-May-1992
• Referred By: ASTM G169-01(2021) - Standard Guide for Application of Basic Statistical Methods to Weathering Tests
• Effective Date: 15-May-1992
• Referred By: ASTM D1014-18 - Standard Practice for Conducting Exterior Exposure Tests of Paints and Coatings on Metal Substrates
• Effective Date: 15-May-1992
• Referred By: ASTM D5824-98(2023) - Standard Test Method for Determining Resistance to Delamination of Adhesive Bonds in Overlay-Wood Core Laminates Exposed to Heat and Water
• Effective Date: 15-May-1992
• Referred By: ASTM D3930-08(2023) - Standard Specification for Adhesives for Wood-Based Materials for Construction of Manufactured Homes
• Effective Date: 15-May-1992
• Referred By: ASTM D2559-12a(2018) - Standard Specification for Adhesives for Bonded Structural Wood Products for Use Under Exterior Exposure Conditions
• Effective Date: 15-May-1992

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:E41–92(Reapproved2004)
Standard Terminology Relating To
Conditioning
This standard is issued under the fixed designation E41; the number immediately following the designation indicates the year of original
adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.Asuperscript
epsilon (´) indicates an editorial change since the last revision or reapproval.
1. Scope pressure of 76 cm Hg (101325 Pa) having a density of
3 2
13.5951 g/cm , under standard gravity of 980.665 cm/s .
1.1 Thesedefinitionspertaintotheconditioningofmaterials
atmosphere, standard—airmaintainedataspecifiedtempera-
for test purposes. Unless otherwise specified, they are intended
ture, relative humidity, and standard atmospheric pressure.
to apply to all cases where combinations of atmospheric
E171
influences are an essential part of the testing of materials.
condition, standard—the condition reached by a specimen
1.2 It is the intent of this standard to include those condi-
when it is in temperature and moisture equilibrium with a
tioning terms in wide use in ASTM for which standard
standard atmosphere.
definitions appear desirable.
conditioning—the exposure of a material to the influence of a
2. Referenced Documents prescribed atmosphere for a stipulated period of time or until
a stipulated relation is reached between material and atmo-
2.1 ASTM Standards:
sphere.
E171 Specification for Atmospheres for Conditioning and
dehumidify—to reduce, by any process, the quantity of water
Testing Flexible Barrier Materials
vapor within a given space.
E337 Test Method for Measuring Humidity with a Psy-
dew point—the temperature to which water vapor must be
chrometer (the Measurement of Wet- and Dry-Bulb Tem-
reduced to obtain saturation vapor pressure, that is, 100 %
peratures)
relative humidity.
3. Terminology
NOTE 1—As air is cooled, the amount of water vapor that it can hold
3.1 Definitions:
decreases. If air is cooled sufficiently, the actual water vapor pressure
becomes equal to the saturation water-vapor pressure, and any further
air conditioning—the simultaneous control of all, or at least
cooling beyond this point will normally result in the condensation of
thefirstthree,ofthosefactorsaffectingboththephysicaland
moisture.
chemical conditions of the atmosphere within any structure.
humidify—to increase, by any process, the quantity of water
These factors include temperature, humidity, motion, distri-
vapor within a given space.
bution, dust, bacteria, odor, and toxic gases.
humidistat—a regulatory device, activated by changes in
air, dry—air containing no water vapor.
humidity,usedfortheautomaticcontrolofrelativehumidity.
air, saturated—a mixture of dry air and water vapor in which
humidity—the condition of the atmosphere in respect to water
the latter is at its maximum concentration for the prevailing
vapor. (See also humidity, absolute; humidity, relative.)
temperature and pressure.
humidity, absolute—the weight of water vapor present in a
atmospheric pressure—the pressure due to the weight of the
unit volume of air, for example, grains per cubic foot, or
atmosphere. It is the pressure indicated by a barometer that
grams per cubic metre.
registers actual atmospheric pressure which is not corrected
to sea level equivalence. Standard atmospheric pressure is a
NOTE 2—The amount of water vapor is also reported in terms of weight
per unit weight of dry air, for example, grains per pound of dry air. This
value differs from values calculated on a volume basis and should not be
referred to as absolute humidity. It is designated as humidity ratio,
This terminology is under the jurisdiction of ASTM Committee G03 on
specific humidity, or moisture content, which also see.
Weathering and Durability and is the direct responsibility of Subcommittee G03.92
on Terminology.
humidity ratio—in a mixture of water vapor and air, the mass
Current edition approved June 1, 2004. Published June 2004. Originally
of water vapor per unit mass of dry air.
approved in 1942. Last previous edition approved in 2003 as E41 – 92 (2003). DOI:
10.1520/E0041-92R04.
humidity, relative—the ratio of the actual pressure of existing
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
water vapor to the maximum possible (saturation) pressure
contact ASTM Customer Service at [e-mail]. For Annual Book of ASTM
of water vapor in the atmosphere at the same temperature,
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website. expressed as a percentage.
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