FRM PM2.5 MASS PTFE FILTERS - TEFLON FILTER HANDLING

Sep 4, 2026

Uploaded by Logic

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.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages27

Reading Time1 h 8 min

AccessFree to download

GENERAL OVERVIEW

MTL PTFE FILTER ANATOMY

FILTER INSPECTIONS AND PRECONDITIONING

PRE-INSPECTIONS DEFECT VS. REJECT

REJECT EXAMPLES

FAQs

What are the key components of the MTL PTFE filter anatomy?

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.

What is the difference between a filter defect and a filter reject?

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.

What is the annual volume of filter pre-inspections and rejections mentioned in the document?

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.

Sep 4, 2026

Uploaded by Logic