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ASTM F312-2008

显微镜测量和计数薄膜滤器上航空与航天液体的粒子的试验方法

Standard Test Methods for Microscopical Sizing and Counting Particles from Aerospace Fluids on Membrane Filters

适用范围:<p>Reported particle size measurement is a function of both the actual particle dimension and shape factor as well as the particular physical or chemical properties of the particle being measured. Caution is required when comparing data from instruments operating on different physical or chemical parameters or with different particle size measurement ranges. Sample acquisition, handling and preparation can also affect the reported particle size results.</p><p id="s00002">1.1 These test methods cover the determination of the size distribution and quantity of particulate matter contamination from aerospace fluids isolated on a membrane filter. The microscopical techniques described may also be applied to other properly prepared samples of small particles. Two test methods are described for sizing particles as follows:</p> <p id="s00003">1.1.1 <span class="italic"><span class="italic">Test Method A</span>8212;</span>Particle sizes are measured as the diameter of a circle whose area is equal to the projected area of the particle.</p> <p id="s00004">1.1.2 <span class="italic"><span class="italic">Test Method B</span>8212;</span>Particle sizes are measured by their longest dimension.</p> <p id="s00005">1.2 The test methods are intended for application to particle contamination determination of aerospace fluids, gases, surfaces, and environments.</p> <p id="s00101">1.3 The values stated in SI units are to be regarded as standard. No other units of measurement are included in this standard.</p> <p id="s00006">1.4 These test methods do not provide for sizing particles smaller than 5 <span class=''unicode''>x03BC;</span>m. <p class="desc" id="N00001"> <span class="smallcap">Note</span> 18212;Results of these methods are subject to variables inherent in any statistical method. The use of these methods as a standard for initially establishing limits should be avoided unless ample tolerances are permissible.</p> </p> <p id="s00007">1.5 <span class="italic">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.</span>

实施日期: 2008-11-01

中标分类号: V04 - 航空、航天 - 基础标准与通用方法

ICS分类号: 49.080 - 航空器和航天器工程 - 航空航天流体系统和零部件

标准组织: ASTM - 美国材料与试验协会标准

全文来源: WF

英文关键词: aerospace environments aerospace fluids aerospace gases aerospace surfaces membrane filter microscopical counting particles microscopical sizing particles particulate matter contamination Aerospace particulate contamination Contamination--aerospace materials/applications Counting Membrane filters (MF)--aerospace fluids Microscopic examination--aerospace materials Particulate contamination (aerospace environments)

语种: 汉语

页数: 4

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