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ASTM D6902-04

(Test Method)

Standard Test Method for Laboratory Measurement of Formaldehyde Evolved During the Curing of Melamine-Formaldehyde-Based Coatings

Standard Test Method for Laboratory Measurement of Formaldehyde Evolved During the Curing of Melamine-Formaldehyde-Based Coatings

SCOPE
1.1 This test method is for the determination of formaldehyde evolved from melamine-formaldehyde-based coatings during the cure step. The results may be used to determine the "cure formaldehyde" evolved from a sample under controlled laboratory conditions.
1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.
1.3 This test method is capable of measuring from 500 μg/g to 22 000 μg formaldehyde/g dry coating under the test conditions specified (3 000 ml/min total flow, 50 ml/min DNPH tube flow). The ratio of total flow to DNPH tube flow could be adjusted to extend the range of the method.
1.4 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 and health practices and determine the applicability of regulatory limitations prior to use.

General Information

Status
Historical
Publication Date
30-Jun-2004
ICS
83.080.10 - Thermosetting materials
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

Replaces
ASTM D6902-03 - Standard Test Method for Laboratory Measurement of Formaldehyde Evolved During the Curing of Melamine-Formaldehyde-Based Coatings
Effective Date
01-Jul-2004
Replaced By
ASTM D6902-04e1 - Standard Test Method for Laboratory Measurement of Formaldehyde Evolved During the Curing of Melamine-Formaldehyde-Based Coatings
Effective Date
01-Jul-2004

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ASTM D6902-04 - Standard Test Method for Laboratory Measurement of Formaldehyde Evolved During the Curing of Melamine-Formaldehyde-Based CoatingsASTM D6902-04 - Standard Test Method for Laboratory Measurement of Formaldehyde Evolved During the Curing of Melamine-Formaldehyde-Based Coatings
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ASTM D6902-04 - Standard Test Method for Laboratory Measurement of Formaldehyde Evolved During the Curing of Melamine-Formaldehyde-Based Coatings
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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: D 6902 – 04
Standard Test Method for
Laboratory Measurement of Formaldehyde Evolved During
1
the Curing of Melamine-Formaldehyde-Based Coatings
This standard is issued under the fixed designation D 6902; 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 (e) indicates an editorial change since the last revision or reapproval.
1. Scope 3.1.1 cure formaldehyde, n—the formaldehyde generated as
the result of a chemical reaction during coating curing.
1.1 This test method is for the determination of formalde-
3.1.2 free formaldehyde, n—the residual formaldehyde in a
hyde evolved from melamine-formaldehyde-based coatings
coating due to the raw materials.
during the cure step. The results may be used to determine the
“cure formaldehyde” evolved from a sample under controlled
4. Summary of Test Method
laboratory conditions.
4.1 Approximately 0.2 g of coating formulation is placed in
1.2 The values stated in SI units are to be regarded as the
an aluminum foil pan, dried in a vacuum oven at 40°C (to
standard. The values given in parentheses are for information
remove free formaldehyde and solvents) and then baked at the
only.
optimum process cure temperature for 30 min. Formaldehyde
1.3 This test method is capable of measuring from 500 μg/g
emissions are collected from the cure chamber on a DNPH/
to 22 000 μg formaldehyde/g dry coating under the test
Silica tube, which is then extracted and the extract analyzed by
conditions specified (3 000 ml/min total flow, 50 ml/min
HPLC/UV. The amount of formaldehyde evolved from the
DNPH tube flow). The ratio of total flow to DNPH tube flow
coating during the cure step is calculated on both a wet-weight
could be adjusted to extend the range of the method.
and dry-weight basis. The test is run in triplicate plus a blank
1.4 This standard does not purport to address all of the
and system standard.
safety concerns, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Significance and Use
priate safety and health practices and determine the applica-
5.1 This test method measures the amount of formaldehyde
bility of regulatory limitations prior to use.
that is evolved from a coating containing melamine-
formaldehyde resin(s) during cure at elevated temperature.
2. Referenced Documents
2 Cure formaldehyde results from a side-reaction during cross-
2.1 ASTM Standards:
3 linking of functionalized polymers with melamine-
D 362 Specification for Industrial Grade Toluene
formaldehyde resins. Cure formaldehyde is evolved in the final
D 1979 Test Method for Free Formaldehyde Content of
bake or cure oven, when the coating temperature is high
Amino Resins
enough to initiate cross-linking. Formaldehyde can be released
D 6191 Test Method for Measurement of Evolved Formal-
from a coating during application, solvent flash-off and cure.
dehyde from Water Reducible Air-Dry Coatings
Free formaldehyde is primarily evolved during coating appli-
E 691 Practice for Conducting an Interlaboratory Study to
cation and solvent flash-off. Test Method D 1979 measures
Determine the Precision of a Test Method
“free formaldehyde” in amino resins and Test Method D 6191
3. Terminology measures evolved formaldehyde in coatings. This method
measures only the formaldehyde released during heat cure,
3.1 Definitions of Terms Specific to This Standard:
which is primarily “cure formaldehyde.”
5.2 This test method is not intended to duplicate the evolved
1
This test method is under the jurisdiction of ASTM Committee D01 on Paint formaldehyde from an industrial process, but serves as a
and Related Coatings, Materials, and Applications and is the direct responsibility of
reproducible comparative laboratory evaluation.
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
5.3 This test method has not been evaluated with catalyzed
Current edition approved July 1, 2004. Published July 2004. Originally approved
coating systems that cure at or below 40°C, such as those used
in 2003. Last previous edition approved in 2003 as D 6902 – 03.
2
For referenced ASTM standards, visit the ASTM website, www.astm.org, or
by the wood-finishing industry, and would likely require
contact ASTM Customer Service at service@astm.org. For Annual Book of ASTM
special adaptation for this application.
Standards volume information, refer to the standard’s Document Summary page on
the ASTM website.
3
Withdrawn.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
1

---------------------- Page: 1 ----------------------
D6902–04
6. Apparatus 7.4 Water, HPLC Grade.
7.5 Acetonitrile,
...

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ASTM D6902-04(2023)(Test Method)
Standard Test Method for Laboratory Measurement of Formaldehyde Evolved During the Curing of Melamine-Formaldehyde-Based Coatings

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5.1 This test method measures the amount of formaldehyde that is evolved from a coating containing melamine-formaldehyde resin(s) during cure at elevated temperature. Cure formaldehyde results from a side-reaction during cross-linking of functionalized polymers with melamine-formaldehyde resins. Cure formaldehyde is evolved in the final bake or cure oven, when the coating temperature is high enough to initiate cross-linking. Formaldehyde can be released from a coating during application, solvent flash-off and cure. Free formaldehyde is primarily evolved during coating application and solvent flash-off. Test Method D1979 measures “free formaldehyde” in amino resins and Test Method D6191 measures formaldehyde evolved from coatings at ambient temperature. This method measures only the formaldehyde released during heat cure, which is primarily “cure formaldehyde.”  
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