[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"doc-seo-203233-105":3,"detail-sidebar-cat-0-en-105":81,"doc-detail-203233-en":130},{"code":4,"msg":5,"data":6},0,"ok",{"site_id":7,"language":8,"slug":9,"title":10,"keywords":11,"description":12,"schema_data":13,"social_meta":74,"head_meta":76,"extra_data":78,"updated_unix":80},105,"en","frm-pm25-mass-ptfe-filters-teflon-filter-handling","FRM PM2.5 MASS PTFE FILTERS - TEFLON FILTER HANDLING","","This document provides a comprehensive overview of FRM PM2.5 Mass PTFE filters, focusing on Teflon filter handling and inspection procedures. It details filter anatomy, including dimensions and materials, and outlines the critical steps for preparing filters for field use and handling them appropriately once in the field. The document emphasizes sample recovery importance for accurate analysis and covers back-to-lab procedures, including final inspections. A significant portion is dedicated to filter inspections, differentiating between defects and rejections, with statistics on annual filter pre-inspections and rejection rates. Specific examples of defects like loose material, non-uniformity, and features are contrasted with rejects such as pinholes, ring separation, discoloration, contamination, scratches, cuts, dents, and inconsistent thickness. The text also lists the personnel involved in the process, Ali Adams and Nial Maloney from the California Air Resources Board. The document serves as a guide for ensuring the integrity and proper use of PTFE filters in air pollution monitoring and analysis.",{"@graph":14,"@context":73},[15,34,56],{"@type":16,"itemListElement":17},"BreadcrumbList",[18,23,27,31],{"item":19,"name":20,"@type":21,"position":22},"https://docshare.wps.com","Home","ListItem",1,{"item":24,"name":25,"@type":21,"position":26},"https://docshare.wps.com/document/","Document",2,{"item":28,"name":29,"@type":21,"position":30},"https://docshare.wps.com/document/research-report/","Research & Report",3,{"item":32,"name":10,"@type":21,"position":33},"https://docshare.wps.com/document/frm-pm25-mass-ptfe-filters-teflon-filter-handling/203233/",4,{"url":32,"name":10,"@type":35,"image":36,"author":41,"headline":10,"publisher":44,"fileFormat":47,"inLanguage":8,"description":12,"dateModified":48,"datePublished":49,"encodingFormat":47,"isAccessibleForFree":50,"interactionStatistic":51},"DigitalDocument",{"url":37,"@type":38,"width":39,"height":40},"https://docshare.wps.com/thumbnails/frm-pm25-mass-ptfe-filters-teflon-filter-handling/203233.png","ImageObject",300,407,{"name":42,"@type":43},"Logic","Person",{"url":19,"name":45,"@type":46},"DocShare","Organization","application/pdf","2026-10-29","2026-09-04",true,{"@type":52,"interactionType":53,"userInteractionCount":55},"InteractionCounter",{"@type":54},"ViewAction",9,{"@type":57,"mainEntity":58},"FAQPage",[59,65,69],{"name":60,"@type":61,"acceptedAnswer":62},"What are the key components of the MTL PTFE filter anatomy?","Question",{"text":63,"@type":64},"The MTL PTFE filter has a 46.2 mm diameter, a PTFE membrane with a 2 μm pore size, and a Polyfluoro Alkoxy (PFA) support ring. It also features printed serial numbers on both sides.","Answer",{"name":66,"@type":61,"acceptedAnswer":67},"What is the difference between a filter defect and a filter reject?",{"text":68,"@type":64},"Defects include loose material, filter \"features,\" and non-uniformity, which may not necessarily lead to rejection. Rejects, however, are critical flaws like pinholes, ring separation, discoloration, contamination, scratches, cuts, dents, and inconsistent thickness, which render the filter unusable.",{"name":70,"@type":61,"acceptedAnswer":71},"What is the annual volume of filter pre-inspections and rejections mentioned in the document?",{"text":72,"@type":64},"Approximately 12,000 filter pre-inspections are conducted each year, with about 500 filters weighed monthly. The document highlights a 50% rejection rate among inspected filters.","https://schema.org",{"og:url":32,"og:type":75,"og:title":10,"og:site_name":45,"og:description":12},"article",{"robots":77,"canonical":32},"index,follow",{"doc_id":79,"site_id":7},203233,1788557446,{"code":4,"msg":82,"data":83},"success",[84,88,92,96,101,106,111,115,119,122,126],{"id":22,"doc_module":4,"doc_module_name":25,"category_name":85,"show_sort_weight":86,"slug":87},"Story & Novel",90,"story-novel",{"id":26,"doc_module":4,"doc_module_name":25,"category_name":89,"show_sort_weight":90,"slug":91},"Literature",80,"literature",{"id":33,"doc_module":4,"doc_module_name":25,"category_name":93,"show_sort_weight":94,"slug":95},"Exam",70,"exam",{"id":97,"doc_module":4,"doc_module_name":25,"category_name":98,"show_sort_weight":99,"slug":100},5,"Comic",60,"comic",{"id":102,"doc_module":4,"doc_module_name":25,"category_name":103,"show_sort_weight":104,"slug":105},6,"Technology",50,"technology",{"id":107,"doc_module":4,"doc_module_name":25,"category_name":108,"show_sort_weight":109,"slug":110},7,"Healthcare",40,"healthcare",{"id":112,"doc_module":4,"doc_module_name":25,"category_name":29,"show_sort_weight":113,"slug":114},8,30,"research-report",{"id":55,"doc_module":4,"doc_module_name":25,"category_name":116,"show_sort_weight":117,"slug":118},"Religion & Spirituality",20,"religion-spirituality",{"id":117,"doc_module":4,"doc_module_name":25,"category_name":120,"show_sort_weight":117,"slug":121},"World Cup","world-cup",{"id":123,"doc_module":4,"doc_module_name":25,"category_name":124,"show_sort_weight":123,"slug":125},10,"Lifestyle","lifestyle",{"id":127,"doc_module":4,"doc_module_name":25,"category_name":128,"show_sort_weight":97,"slug":129},19,"General","general",{"code":4,"msg":82,"data":131},{"doc_id":79,"user_id":132,"nickname":42,"user_avatar":133,"doc_module":4,"category_id":112,"category_name":29,"doc_title":10,"doc_description":12,"doc_content":134,"file_id":135,"file_url":136,"file_type":137,"file_size":138,"view_count":55,"is_deleted":4,"is_public":22,"is_downloadable":22,"audit_status":22,"page_count":139,"language":140,"language_code":8,"site_id":7,"html_lang":8,"table_of_contents":141,"faqs":142,"seo_title":143,"seo_description":12,"update_tm":80,"read_time":144,"preview_page_count":4},1099513958762,"https://ap-avatar.wpscdn.com/avatar/1000023916a998db790?x-image-process=image/resize,m_fixed,w_180,h_180&k=1784791008015729253","|  |  | | | FRM PM2.5 MASS PTFE FILTERS\u003Cbr>TEFLON FILTER HANDLING |  |\n| --- | --- | --- | --- | --- | --- |\n|  |  |  |  | | Ali Adams\u003Cbr>Nial Maloney\u003Cbr>Air Pollution Specialists, Inorganic Laboratory Section Monitoring and Laboratory Division\u003Cbr>California Air Resources Board |\n\nGENERAL OVERVIEW  \n􀁼 Filter Anatomy  \n􀁼 Filter Inspections: Defect vs . Reject  \n􀁼 Preparing for the Field  \n􀁼 Filter Handling in the Field  \n􀁼 Sample Recovery: What’s Important?  \n􀁼 Back to the Lab  \n􀁼 Final Inspections and Analysis  \n􀁼 Questions and Answers  \n| MTL PTFE FILTER ANATOMY |  |\n| --- | --- |\n| \u003Cbr>46.2 mm Diameter\u003Cbr>Expected weight 395 mg – 425 mg | Support Ring Polyfluoro Alkoxy (PFA)\u003Cbr>PTFE (polytetrafluoroethylene) membrane with 2 μmpore size\u003Cbr>Printed serial numbers on both sides\u003Cbr>PTFE coated, nonmagnetic, nonserrated, stainless steel forceps\u003Cbr>3 |\n|  |  |\n\nFILTER INSPECTIONS AND PRECONDITIONING  \n􀁼 ~ 500 filters pre-weighed each month = 6,000/year .  \n􀁼 ~ 2 filters inspected for every 1 to the field.  \n􀁹 50% Rejection  \n􀁼 ~ 12,000 filter PREinspections each year .  \nPRE-INSPECTIONS DEFECT VS. REJECT  \n􀁼 Loose Material (Defect)  \n􀁼 Filter “Features”(Defect)  \n􀁼 Non-Uniformity (Defect)  \nPRE-INSPECTIONS DEFECT VS. REJECT  \n􀁼 Pinholes (Reject)  \n􀁼 Ring Separation (Reject)  \n􀁼 Discoloration (Reject)  \n􀁼 Contamination (Reject)  \n􀁹 Pre and Post Field  \n􀁼 Imperfections (Reject)  \n􀁹  \n􀁹  \n􀁹  \n􀁹  \nScratches Cuts Dents  \nInconsistent thickness  \n6  \nREJECT EXAMPLES  \nCUT  \nDENT  \nHARD TO SEE???  \nREJECT EXAMPLES  \nSCRATCH  \nREJECT EXAMPLES  \nINCONSISTENCY","cbCaimWpbR9jitRn","https://ap.wps.com/l/cbCaimWpbR9jitRn","pdf",2599832,27,"English","# GENERAL OVERVIEW\n# MTL PTFE FILTER ANATOMY\n# FILTER INSPECTIONS AND PRECONDITIONING\n# PRE-INSPECTIONS DEFECT VS. REJECT\n# REJECT EXAMPLES","[{\"question\":\"What are the key components of the MTL PTFE filter anatomy?\",\"answer\":\"The MTL PTFE filter has a 46.2 mm diameter, a PTFE membrane with a 2 μm pore size, and a Polyfluoro Alkoxy (PFA) support ring. It also features printed serial numbers on both sides.\"},{\"question\":\"What is the difference between a filter defect and a filter reject?\",\"answer\":\"Defects include loose material, filter \\\"features,\\\" and non-uniformity, which may not necessarily lead to rejection. Rejects, however, are critical flaws like pinholes, ring separation, discoloration, contamination, scratches, cuts, dents, and inconsistent thickness, which render the filter unusable.\"},{\"question\":\"What is the annual volume of filter pre-inspections and rejections mentioned in the document?\",\"answer\":\"Approximately 12,000 filter pre-inspections are conducted each year, with about 500 filters weighed monthly. The document highlights a 50% rejection rate among inspected filters.\"}]","FRM PM2.5 MASS PTFE FILTERS - TEFLON FILTER HANDLING | PDF",68]