Ash content gives an estimate of the inorganic content of cellulose ester samples. The presence of high levels of inorganic content (ash) can be detrimental to the melt stability and optical clarity of a cellulose ester in melt processing or act as a potential source of insolubles when the ester is used in solution.
1.1 These test methods cover procedures for the testing of cellulose acetate propionates and acetate butyrates. These esters may vary widely in composition and properties, so certain of the procedures can be used only in the ranges of composition where they are suitable.
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 The test procedures appear in the following sections:
| Sections | |
| Acetyl Propionyl or Butyryl Contents | 28-37 |
| Acetyl Content, Apparent | 18-27 |
| Acidity, Free | 12-17 |
| Ash | 7-10 |
| Color and Haze | 77-81 |
| Heat Stability | 57-65 |
| Hydroxyl Content | 38-44 |
| Hydroxyl Content, Primary | 46-50 |
| Intrinsic Viscosity | 67-71 |
| Moisture Content | 5-6 |
| Sulfur or Sulfate Content | 51-56 |
| Viscosity | 74-75 |
| Limiting Viscosity Number | 67-71 |
1.4 This standard does not purport to address 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. 18.1 The test methods described in the following 20 to 26 cover the determination of the saponification value of the sample calculated as percentage of apparent acetyl, equivalent weight 43. This value is required in the calculation of acetyl and propionyl or butyryl contents in 36.1. 18.2 The test method used should be specified or agreed upon. The choice depends on the propionyl or butyryl content and the physical condition of the sample. Ordinarily, Test Method A is recommended for samples having less than about 35 % propionyl or butyryl and Test Method B for samples having more than that amount. 28.1 The test methods described in the following Sections 30 to 36 cover the determination of acetyl and propionyl or butyryl contents of cellulose mixed esters by calculation from the apparent acetyl content, determined in accordance with Sections 18 to 26, and the molar ratio of acetyl and propionyl or butyryl, determined in accordance with Sections 30 to 35. The molar ratio of acetyl and propionyl or butyryl is determined by saponifying, acidifying, vacuum distilling off the mixture of acids, and determining the distribution ratio of the acids between n-buty......
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