ASTM D6886-24 - Standard Test Method for Determination of the Weight Percent Individual Volatile Organic Compounds in Air-Dry Low VOC Coatings by Gas Chromatography
Standard Test Method for Determination of the Weight Percent Individual Volatile Organic Compounds in Air-Dry Low VOC Coatings by Gas Chromatography
| Standard number: | ASTM D6886-24 |
| Released: | 01.11.2024 |
| Status: | Active |
| Pages: | 11 |
| Section: | 06.01 |
| Keywords: | gas chromatography; speciation; volatile organic compounds; waterborne coatings; |
1.1 This test method is for the determination of the weight percent of individual volatile organic compounds in low VOC air-dry coatings (Note 1).
1.2 This test method may be used for the analysis of coatings containing silanes, siloxanes, and silane-siloxane blends.
1.3 This test method is not suitable for the analysis of coatings that cure by chemical reaction (this includes two-component coatings and coatings which cure when heated) because the dilution herein required will impede the chemical reaction required for these types of coatings.
1.4 Precision statistics for this test method have been determined for waterborne coatings in which the volatile organic compound weight percent is below 5 percent. The method has been used successfully with higher organic content waterborne coatings and with solventborne coatings (Note 2).
1.5 This test method may also be used to measure the exempt volatile organic compound content (for example, acetone, methyl acetate, t-butyl acetate and p-chlorobenzotrifluoride) of waterborne and solvent-borne coatings. Check local regulations for a list of exempt compounds. The methodology is virtually identical to that used in Test Method D6133 which, as written, is specific for only exempt volatile compounds.
1.6 Volatile compounds that are present at the 0.005 weight percent level (50 ppm) or greater can be determined. A procedure for doing so is given in Section 9.
1.7 Volatile organic compound content of a coating can be calculated using data from Test Method D6886 but requires other data (see Appendix X2.)
Note 1: Data from this test method will not always provide the volatile organic compound content of a paint film equivalent to EPA Method 24. Some compounds and some semi-volatile compounds may be considered volatile using the GC conditions specified but will not fully volatilize during the one hour at 110 °C conditions of EPA Method 24. Some or all of these materials remain in the paint film and therefore are not considered volatile organic compounds according to EPA Method 24. In addition, some compounds may decompose at the high inlet temperature of the GC. However, EPA Method 24 has poor precision and accuracy at low levels of volatile organic compounds. To determine whether Test Method D6886 or EPA Method 24 are suitable for VOC determination, low VOC is defined as VOC content less than 150 g/L. For coatings with VOC content higher than 150 g/L, EPA Method 24 is preferred. For low VOC coatings (below 150 g/L), Test Method D6886 is more suitable.
Note 2: This test method measures volatile organic compound weight of air-dry coatings directly as opposed to other methods in Practice D3960 which measure the volatile organic compound weight percent indirectly. A direct measurement of the weight percent particularly in low volatile organic compound content waterborne coatings (< 150 g/L), generally gives better precision. California Polytechnic State University carried out an extensive study for the California Air Resources Board comparing the precision of the direct method with the indirect method (CARB Standard Agreement No. 04.329) Detailed results of this study may be found in Development of an Improved VOC Analysis Method for Architectural Coatings.2 This study may be used to decide if the present method or other methods in Practice D3960 are preferred for a specific coating.
1.8 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.
1.9 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.
1.10 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.