Tiêu chuẩn quốc tế

• Số hiệu / Standard Number: ASTM D2013/D2013M-12
• Năm ban hành / Publication date: 2018
• Tình trạng / Status: A - Còn hiệu lực
• Tên tiếng Anh / Title in English: Standard Practice for Preparing Coal Samples for Analysis
• Chỉ số phân loại Quốc tế (ICS) / By field: 73.040 - Than
• Số trang / Page: 12
• Phạm vi áp dụng / Scope of standard: Other standards are used to collect the gross sample: Practice D2234/D2234M allows for one division of the gross sample before crushing. The mass and top size of the gross or divided sample collected by using these guides and practices are usually too large for chemical or physical testing. Practice D2013 provides instructions for reducing and dividing the gross or divided sample, by on-line or off-line processes, or both, to a top size and mass suitable to the performance of testing. Any bias in the gross or divided sample before adherence to this practice will remain in the final sample resulting from use of this practice. Therefore, carefully select the standard to be used to collect the gross sample.