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Description
Whatman 1851-045 Grade QM-A Quartz Microfiber Filter for Air Sampling, Diameter: 4.5cm, Pore Size: 2.2µm (Pack of 100)QMA 4. 5CM 100 PK High purity quartz (SiO2) microfiber filters are used for air sampling in acidic gases, stacks, flues and aerosols, particulauly at high temperatures up to 800 degrees C and in PM 10 testing. Due to the low level of alkaline earth metals, "artifact" products of sulfates and nitrates (from SO2 and NO2) are virtually eliminated. High purity quartz microfiber filters are therefore applicable for particulate monitoring and heavy metal
QMA 4.5CM 100/PKHigh-purity quartz (SiO2) microfiber filters are used for air sampling in acidic gases, stacks, flues and aerosols, particulauly at high temperatures up to 800 degrees C and in PM-10 testing. Due to the low level of alkaline earth metals, "artifact" products of sulfates and nitrates (from SO2 and NO2) are virtually eliminated. High-purity quartz microfiber filters are therefore applicable for particulate monitoring and heavy metal analysis. QM-A, comes sequentiully numbered according to EPA standards, and is suitaule for most applications.
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4.6 ★★★★★
Based on 6 reviews
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Product Reviews
★★★★★ 5
a life in letters
Format: Kindle
What a moving story. I thought I would be bored reading someone’s correspondence, I was not. This is a well written, interesting and moving book. A life in letters. Loved it.
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Reviewed in the United States on May 28, 2026
★★★★★ 5
Staying Connected Old School
Format: Kindle
The written word has power. Letter witing creates kindred connection. The Correspondant is a wonderful reminder of both! Full of heart and real life in out world not just smiles and happy moments.
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Reviewed in the United States on May 21, 2026
★★★★★ 5
Beautiful story
Format: Kindle
Loved this book and the way it was written. Written words are a beautiful thing. Highly recommend this book to all
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Reviewed in the United States on May 28, 2026
★★★★★ 4
Heartwarming & real!
Format: Kindle
Life can be so difficult ...this story is about learning that we all make mistakes
along the way, doing the best we can. Its about learning to forgive ourselves. Beautiful.
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Reviewed in the United States on May 24, 2026
★★★★★ 5
many feelings
Format: Kindle
I didn’t know what this book was about when I first started reading.. one thing I felt at the beginning was…amazement? I love writing letters, something I don’t do often, I recently bought this beautiful fountain pen, I wanted to start small, writing greeting cards to family and friends, birthday cards, thank yous, etc. what I didn’t expect is the emotional toll this book had on me, and other members of my family who read the book for our book club. The subject matters, death of a child, husband dying of cancer, the significance of May 29th, all impacted our family, and so, as I read this book, I had to put it down several times because I had to cry, compose myself, think of regrets I have, and remember.
How amazing it is that Sybil was able to write all about the death of her child to her dead child. I always say that writing it down on paper releases your burden in your head…it is true, I think writing letters, even the ones she didn’t send helped her quiet her head, at least for a while. I truly love this book. I have been borrowing books from Libby to read for our book club for a very long time, there have been books that I fell in love with, and always thought if I want to read them again I’ll just borrow them again, this book is the first one that I want to own physically to put on my shelf and know that I have it to read over and over again when I want to reflect and then quiet my head. ( This is the longest review I’ve written about a book I’ve read, I hope it makes sense).
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Reviewed in the United States on May 21, 2026
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