Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ASTM D4442-16
• Năm ban hành / Publication date: 2016
• Tình trạng / Status: W - Hết hiệu lực
• Tên tiếng Anh / Title in English: Standard Test Methods for Direct Moisture Content Measurement of Wood and Wood-Based Materials
• Số trang / Page: 6
• Phạm vi áp dụng / Scope of standard: 1.1 These test methods cover the determination of the moisture content (MC) of wood, veneer, and other wood-based materials, including those that contain adhesives and chemical additives. The test methods below describe primary (A) and secondary (B through D) procedures to measure moisture content: Method A-Primary Oven-Drying Method Method B-Secondary Oven-Drying Method Method C-Distillation (Secondary) Method Method D-Other Secondary Methods. 1.2 The primary oven-drying method (Method A) is intended as the sole primary method. It is structured for research purposes where the highest accuracy or degree of precision is needed. 1.3 The secondary methods (B through D) are intended for special purposes or under circumstances where the primary procedure (Method A) is not desired or justified. In these procedures, moisture content values cannot be reported with an accuracy greater than integer percentage values (that is, lower than in Method A). 1.4 Distillation (secondary) method is intended for use with materials that have been chemically treated or impregnated such that the oven-drying procedures introduce greater error than desired in the results. 1.5 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard. 1.6 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.