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ASTM D7358-07(2018)

(Test Method)

Standard Test Method for Water Content of Paints by Quantitative Calcium Hydride Reaction Test Kit

Standard Test Method for Water Content of Paints by Quantitative Calcium Hydride Reaction Test Kit

SIGNIFICANCE AND USE
4.1 Although Test Method D4017 is widely used for the determination of water in paints and related materials, this method may overcome some of the variability found in the Karl Fischer method.  
4.2 Control of water content is often important in controlling the performance of paints, and it is critical in determining volatile organic compound (VOC) content when VOC content is measured by difference from total volatile matter and water content as required in certain federal and state regulations.
SCOPE
1.1 This test method describes the determination of the total water content of paints using a calcium hydride reaction test kit, or water content between 2 and 85 % water.  
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 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, health, and environmental practices and determine the applicability of regulatory limitations prior to use.  
1.4 This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

General Information

Status
Published
Publication Date
31-May-2018
ICS
87.040 - Paints and varnishes
Technical Committee
D01 - Paint and Related Coatings, Materials, and Applications
Drafting Committee
D01.21 - Chemical Analysis of Paints and Paint Materials
Current Stage
Ref Project

Relations

Referred By
ASTM D7768-12(2018) - Standard Test Method for Speciated Organic Volatile Content of Waterborne Multi-Component Coatings by Gas Chromatography
Effective Date
01-Jun-2018
Referred By
ASTM D6886-18 - Standard Test Method for Determination of the Weight Percent Individual Volatile Organic Compounds in Waterborne Air-Dry Coatings by Gas Chromatography
Effective Date
01-Jun-2018

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ASTM D7358-07(2018) - Standard Test Method for Water Content of Paints by Quantitative Calcium Hydride Reaction Test KitASTM D7358-07(2018) - Standard Test Method for Water Content of Paints by Quantitative Calcium Hydride Reaction Test Kit
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ASTM D7358-07(2018) - Standard Test Method for Water Content of Paints by Quantitative Calcium Hydride Reaction Test Kit
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Standards Content (Sample)

This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the
Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.
Designation: D7358 − 07 (Reapproved 2018)
Standard Test Method for
Water Content of Paints by Quantitative Calcium Hydride
1
Reaction Test Kit
This standard is issued under the fixed designation D7358; 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 hydrogen gas. The reaction is carried out in a sealed pressure
vessel and the resulting pressure is then measured using a
1.1 This test method describes the determination of the total
specially designed meter programmed to convert gas pressure
water content of paints using a calcium hydride reaction test
into water content. The results are displayed in milligrams of
kit, or water content between 2 and 85 % water.
water in the reacted sample extract. The actual weight percent
1.2 The values stated in SI units are to be regarded as
water in the whole paint sample is manually calculated using
standard. No other units of measurement are included in this
the exact weights of the paint sample and the diluted extract
standard.
sample, if used.
1.3 This standard does not purport to address all of the
4. Significance and Use
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
4.1 Although Test Method D4017 is widely used for the
priate safety, health, and environmental practices and deter-
determination of water in paints and related materials, this
mine the applicability of regulatory limitations prior to use.
method may overcome some of the variability found in the
1.4 This international standard was developed in accor-
Karl Fischer method.
dance with internationally recognized principles on standard-
4.2 Control of water content is often important in control-
ization established in the Decision on Principles for the
ling the performance of paints, and it is critical in determining
Development of International Standards, Guides and Recom-
volatile organic compound (VOC) content when VOC content
mendations issued by the World Trade Organization Technical
is measured by difference from total volatile matter and water
Barriers to Trade (TBT) Committee.
content as required in certain federal and state regulations.
2. Referenced Documents
5. Interferences
2
2.1 ASTM Standards:
5.1 The following compounds, tested at twice the sample
D1193 Specification for Reagent Water
size,havebeenfoundtoproducenomeasurableresponsetothe
D3925 Practice for Sampling Liquid Paints and Related
calcium hydride reaction test kit and, therefore, cause no
Pigmented Coatings
3
interference at levels up to 40 %:
D4017 Test Method for Water in Paints and Paint Materials
Ethanol
by Karl Fischer Method
Methanol
E29 Practice for Using Significant Digits in Test Data to A
Acetone
Determine Conformance with Specifications
Methyl Ethyl Ketone
Tetrahydrofuran
Diethylene Glycol Dimethyl Ether
3. Summary of Test Method
A
Ethylene Glycol
Diethylene Glycol
3.1 A0.25 mLsample is reacted with a specially formulated
Dipropylene Glycol
calcium hydride reagent to convert water in the sample to
Stearic Acid
2–Ethyl Hexanoic Acid
Lead Oxide (II and III)
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint Aluminum Oxide (Brockman I)
and Related Coatings, Materials, andApplications and is the direct responsibility of
A
0.25 mL sample size program A and B.
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
Current edition approved June 1, 2018. Published June 2018. Originally 5.2 When using the 5 mL sample size programs, that is,
approved in 2007. Last previous edition approved in 2013 as D7358 – 07 (2013).
programs C, D, or E, ethylene glycol and acids have been
DOI: 10.1520/D7358-07R18.
found to produce a positive result in the presence of a small
2
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
Standards volume information, refer to the standard’s Document Summary page on
3
the ASTM website. HydroSCOUT User’s Manual.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
1

---------------------- Page: 1 ----------------------
D7358 − 07 (2018)
amount of water. Ethylene glycol responds at approximately seconds to ensure that the water contacting the remaining
7 % of the volumetric equivalent. calcium hydride does not overheat the side of the tube,
otherwise tube failure can
...

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