Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ASTM D817-12(2019)
• Năm ban hành / Publication date: 2019
• Tình trạng / Status: A - Còn hiệu lực
• Tên tiếng Anh / Title in English: Standard Test Methods of Testing Cellulose Acetate Propionate and Cellulose Acetate Butyrate
• Chỉ số phân loại Quốc tế (ICS) / By field: 85.040 - Bột giấy
• Số trang / Page: 15
• Phạm vi áp dụng / Scope of standard: 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 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. 1.5 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.