1.1 本试验方法用于测定低VOC风干涂料中单个挥发性有机化合物的重量百分比（ 附注1 ). 1.2 该测试方法可用于分析含有硅烷、硅氧烷和硅烷-硅氧烷共混物的涂层。 1.3 该测试方法不适用于分析通过化学反应固化的涂层（这包括双组分涂层和加热固化的涂层），因为本文所需的稀释将阻碍这些类型的涂层所需的化学反应。 1.4 对于挥发性有机化合物重量百分比低于5%的水性涂料，已经确定了该测试方法的精密度统计。该方法已成功地用于较高有机物含量的水性涂料和溶剂型涂料（ 附注2 ). 1.5 该测试方法也可用于测量豁免挥发性有机化合物含量(例如丙酮、乙酸甲酯、 t -乙酸丁酯和 p -氯苯并三氟化物）。查看当地法规，了解豁免化合物的列表。该方法实际上与试验方法中使用的方法相同 D6133 如所写，其仅针对豁免的挥发性化合物。 1.6 可以测定以0.005重量%水平(50ppm)或更高存在的挥发性化合物。第节给出了这样做的过程 9 . 1.7 涂料的挥发性有机化合物含量可以使用来自测试方法的数据来计算 D6886 但需要其他数据（参见 附录X2 .) 附注1: 该测试方法的数据并不总是提供相当于EPA方法24的漆膜的挥发性有机化合物含量。使用指定的GC条件，一些化合物和一些半挥发性化合物可被认为是挥发性的，但在EPA方法24的110℃条件下一小时内不会完全挥发。这些材料中的一些或全部保留在漆膜中，因此根据EPA方法24不被视为挥发性有机化合物。此外，一些化合物可能在GC的高入口温度下分解。然而，EPA方法24在低水平的挥发性有机化合物下具有较差的精密度和准确度。为了确定测试方法D6886或EPA方法24是否适用于VOC测定，低VOC定义为VOC含量小于150g/L。对于VOC含量高于150g/L的涂料，优选EPA方法24。对于低VOC涂料（低于150 g/L），测试方法D6886更合适。附注2: 该测试方法直接测量风干涂料的挥发性有机化合物重量，与实践中的其他方法相反 D3960 间接测量挥发性有机化合物重量百分比。重量百分比的直接测量，特别是在低挥发性有机化合物含量水性涂料中（

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. ====== Significance And Use ====== 5.1 In using Practice D3960 to measure the volatile organic compound content of waterborne coatings, precision can be poor for low volatile organic compound content air-dry coatings if the volatile organic weight percent is determined indirectly. The present method directly identifies and then quantifies the weight percent of individual volatile organic compounds in air-dry coatings ( Note 6 ). The total volatile organic weight percent can be obtained by adding the individual weight percent values ( Note 7 ). Note 6: The present method may be used to speciate solvent-borne air-dry coatings. However, since these normally contain high, and often complex, quantities of solvent, precision tends to be better using other methods contained in Practice D3960 , where the volatile fraction is determined by a direct weight loss determination. Note 7: Detectable compounds may result from thermal decomposition in a hot injection port or from reaction with the extraction solvent. If it can be shown that a material is a decomposition product, or is the result of a reaction with the extraction solvent, then results for that compound should be discounted from the volatile measured by Test Method D6886 .